diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyRuntimeLibcallSignatures.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyRuntimeLibcallSignatures.cpp
new file mode 100644
index 0000000..974aa52
--- /dev/null
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyRuntimeLibcallSignatures.cpp
@@ -0,0 +1,1306 @@
+// CodeGen/RuntimeLibcallSignatures.cpp - R.T. Lib. Call Signatures -*- C++ -*--
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// \brief This file contains signature information for runtime libcalls.
+///
+/// CodeGen uses external symbols, which it refers to by name. The WebAssembly
+/// target needs type information for all functions. This file contains a big
+/// table providing type signatures for all runtime library functions that LLVM
+/// uses.
+///
+/// This is currently a fairly heavy-handed solution.
+///
+//===----------------------------------------------------------------------===//
+
+#include "WebAssemblyRuntimeLibcallSignatures.h"
+#include "WebAssemblySubtarget.h"
+#include "llvm/CodeGen/RuntimeLibcalls.h"
+
+using namespace llvm;
+
+namespace {
+
+enum RuntimeLibcallSignature {
+  func,
+  f32_func_f32,
+  f32_func_f64,
+  f32_func_i32,
+  f32_func_i64,
+  f32_func_i16,
+  f64_func_f32,
+  f64_func_f64,
+  f64_func_i32,
+  f64_func_i64,
+  i32_func_f32,
+  i32_func_f64,
+  i32_func_i32,
+  i64_func_f32,
+  i64_func_f64,
+  i64_func_i64,
+  f32_func_f32_f32,
+  f32_func_f32_i32,
+  f32_func_i64_i64,
+  f64_func_f64_f64,
+  f64_func_f64_i32,
+  f64_func_i64_i64,
+  i16_func_f32,
+  i8_func_i8_i8,
+  func_f32_iPTR_iPTR,
+  func_f64_iPTR_iPTR,
+  i16_func_i16_i16,
+  i32_func_f32_f32,
+  i32_func_f64_f64,
+  i32_func_i32_i32,
+  i64_func_i64_i64,
+  i64_i64_func_f32,
+  i64_i64_func_f64,
+  i16_i16_func_i16_i16,
+  i32_i32_func_i32_i32,
+  i64_i64_func_i64_i64,
+  i64_i64_func_i64_i64_i64_i64,
+  i64_i64_i64_i64_func_i64_i64_i64_i64,
+  i64_i64_func_i64_i64_i32,
+  iPTR_func_iPTR_i32_iPTR,
+  iPTR_func_iPTR_iPTR_iPTR,
+  f32_func_f32_f32_f32,
+  f64_func_f64_f64_f64,
+  func_i64_i64_iPTR_iPTR,
+  func_iPTR_f32,
+  func_iPTR_f64,
+  func_iPTR_i32,
+  func_iPTR_i64,
+  func_iPTR_i64_i64,
+  func_iPTR_i64_i64_i64_i64,
+  func_iPTR_i64_i64_i64_i64_i64_i64,
+  i32_func_i64_i64,
+  i32_func_i64_i64_i64_i64,
+  unsupported
+};
+
+} // end anonymous namespace
+
+static const RuntimeLibcallSignature
+RuntimeLibcallSignatures[RTLIB::UNKNOWN_LIBCALL] = {
+// Integer
+/* SHL_I16 */ i16_func_i16_i16,
+/* SHL_I32 */ i32_func_i32_i32,
+/* SHL_I64 */ i64_func_i64_i64,
+/* SHL_I128 */ i64_i64_func_i64_i64_i32,
+/* SRL_I16 */ i16_func_i16_i16,
+/* SRL_I32 */ i32_func_i32_i32,
+/* SRL_I64 */ i64_func_i64_i64,
+/* SRL_I128 */ i64_i64_func_i64_i64_i32,
+/* SRA_I16 */ i16_func_i16_i16,
+/* SRA_I32 */ i32_func_i32_i32,
+/* SRA_I64 */ i64_func_i64_i64,
+/* SRA_I128 */ i64_i64_func_i64_i64_i32,
+/* MUL_I8 */ i8_func_i8_i8,
+/* MUL_I16 */ i16_func_i16_i16,
+/* MUL_I32 */ i32_func_i32_i32,
+/* MUL_I64 */ i64_func_i64_i64,
+/* MUL_I128 */ i64_i64_func_i64_i64_i64_i64,
+/* MULO_I32 */ i32_func_i32_i32,
+/* MULO_I64 */ i64_func_i64_i64,
+/* MULO_I128 */ i64_i64_func_i64_i64_i64_i64,
+/* SDIV_I8 */ i8_func_i8_i8,
+/* SDIV_I16 */ i16_func_i16_i16,
+/* SDIV_I32 */ i32_func_i32_i32,
+/* SDIV_I64 */ i64_func_i64_i64,
+/* SDIV_I128 */ i64_i64_func_i64_i64_i64_i64,
+/* UDIV_I8 */ i8_func_i8_i8,
+/* UDIV_I16 */ i16_func_i16_i16,
+/* UDIV_I32 */ i32_func_i32_i32,
+/* UDIV_I64 */ i64_func_i64_i64,
+/* UDIV_I128 */ i64_i64_func_i64_i64_i64_i64,
+/* SREM_I8 */ i8_func_i8_i8,
+/* SREM_I16 */ i16_func_i16_i16,
+/* SREM_I32 */ i32_func_i32_i32,
+/* SREM_I64 */ i64_func_i64_i64,
+/* SREM_I128 */ i64_i64_func_i64_i64_i64_i64,
+/* UREM_I8 */ i8_func_i8_i8,
+/* UREM_I16 */ i16_func_i16_i16,
+/* UREM_I32 */ i32_func_i32_i32,
+/* UREM_I64 */ i64_func_i64_i64,
+/* UREM_I128 */ i64_i64_func_i64_i64_i64_i64,
+/* SDIVREM_I8 */ i8_func_i8_i8,
+/* SDIVREM_I16 */ i16_i16_func_i16_i16,
+/* SDIVREM_I32 */ i32_i32_func_i32_i32,
+/* SDIVREM_I64 */ i64_func_i64_i64,
+/* SDIVREM_I128 */ i64_i64_i64_i64_func_i64_i64_i64_i64,
+/* UDIVREM_I8 */ i8_func_i8_i8,
+/* UDIVREM_I16 */ i16_i16_func_i16_i16,
+/* UDIVREM_I32 */ i32_i32_func_i32_i32,
+/* UDIVREM_I64 */ i64_i64_func_i64_i64,
+/* UDIVREM_I128 */ i64_i64_i64_i64_func_i64_i64_i64_i64,
+/* NEG_I32 */ i32_func_i32,
+/* NEG_I64 */ i64_func_i64,
+
+// FLOATING POINT
+/* ADD_F32 */ f32_func_f32_f32,
+/* ADD_F64 */ f64_func_f64_f64,
+/* ADD_F80 */ unsupported,
+/* ADD_F128 */ func_iPTR_i64_i64_i64_i64,
+/* ADD_PPCF128 */ unsupported,
+/* SUB_F32 */ f32_func_f32_f32,
+/* SUB_F64 */ f64_func_f64_f64,
+/* SUB_F80 */ unsupported,
+/* SUB_F128 */ func_iPTR_i64_i64_i64_i64,
+/* SUB_PPCF128 */ unsupported,
+/* MUL_F32 */ f32_func_f32_f32,
+/* MUL_F64 */ f64_func_f64_f64,
+/* MUL_F80 */ unsupported,
+/* MUL_F128 */ func_iPTR_i64_i64_i64_i64,
+/* MUL_PPCF128 */ unsupported,
+/* DIV_F32 */ f32_func_f32_f32,
+/* DIV_F64 */ f64_func_f64_f64,
+/* DIV_F80 */ unsupported,
+/* DIV_F128 */ func_iPTR_i64_i64_i64_i64,
+/* DIV_PPCF128 */ unsupported,
+/* REM_F32 */ f32_func_f32_f32,
+/* REM_F64 */ f64_func_f64_f64,
+/* REM_F80 */ unsupported,
+/* REM_F128 */ func_iPTR_i64_i64_i64_i64,
+/* REM_PPCF128 */ unsupported,
+/* FMA_F32 */ f32_func_f32_f32_f32,
+/* FMA_F64 */ f64_func_f64_f64_f64,
+/* FMA_F80 */ unsupported,
+/* FMA_F128 */ func_iPTR_i64_i64_i64_i64_i64_i64,
+/* FMA_PPCF128 */ unsupported,
+/* POWI_F32 */ f32_func_f32_i32,
+/* POWI_F64 */ f64_func_f64_i32,
+/* POWI_F80 */ unsupported,
+/* POWI_F128 */ func_iPTR_i64_i64_i64_i64,
+/* POWI_PPCF128 */ unsupported,
+/* SQRT_F32 */ f32_func_f32,
+/* SQRT_F64 */ f64_func_f64,
+/* SQRT_F80 */ unsupported,
+/* SQRT_F128 */ func_iPTR_i64_i64,
+/* SQRT_PPCF128 */ unsupported,
+/* LOG_F32 */ f32_func_f32,
+/* LOG_F64 */ f64_func_f64,
+/* LOG_F80 */ unsupported,
+/* LOG_F128 */ func_iPTR_i64_i64,
+/* LOG_PPCF128 */ unsupported,
+/* LOG2_F32 */ f32_func_f32,
+/* LOG2_F64 */ f64_func_f64,
+/* LOG2_F80 */ unsupported,
+/* LOG2_F128 */ func_iPTR_i64_i64,
+/* LOG2_PPCF128 */ unsupported,
+/* LOG10_F32 */ f32_func_f32,
+/* LOG10_F64 */ f64_func_f64,
+/* LOG10_F80 */ unsupported,
+/* LOG10_F128 */ func_iPTR_i64_i64,
+/* LOG10_PPCF128 */ unsupported,
+/* EXP_F32 */ f32_func_f32,
+/* EXP_F64 */ f64_func_f64,
+/* EXP_F80 */ unsupported,
+/* EXP_F128 */ func_iPTR_i64_i64,
+/* EXP_PPCF128 */ unsupported,
+/* EXP2_F32 */ f32_func_f32,
+/* EXP2_F64 */ f64_func_f64,
+/* EXP2_F80 */ unsupported,
+/* EXP2_F128 */ func_iPTR_i64_i64,
+/* EXP2_PPCF128 */ unsupported,
+/* SIN_F32 */ f32_func_f32,
+/* SIN_F64 */ f64_func_f64,
+/* SIN_F80 */ unsupported,
+/* SIN_F128 */ func_iPTR_i64_i64,
+/* SIN_PPCF128 */ unsupported,
+/* COS_F32 */ f32_func_f32,
+/* COS_F64 */ f64_func_f64,
+/* COS_F80 */ unsupported,
+/* COS_F128 */ func_iPTR_i64_i64,
+/* COS_PPCF128 */ unsupported,
+/* SINCOS_F32 */ func_f32_iPTR_iPTR,
+/* SINCOS_F64 */ func_f64_iPTR_iPTR,
+/* SINCOS_F80 */ unsupported,
+/* SINCOS_F128 */ func_i64_i64_iPTR_iPTR,
+/* SINCOS_PPCF128 */ unsupported,
+/* POW_F32 */ f32_func_f32_f32,
+/* POW_F64 */ f64_func_f64_f64,
+/* POW_F80 */ unsupported,
+/* POW_F128 */ func_iPTR_i64_i64_i64_i64,
+/* POW_PPCF128 */ unsupported,
+/* CEIL_F32 */ f32_func_f32,
+/* CEIL_F64 */ f64_func_f64,
+/* CEIL_F80 */ unsupported,
+/* CEIL_F128 */ func_iPTR_i64_i64,
+/* CEIL_PPCF128 */ unsupported,
+/* TRUNC_F32 */ f32_func_f32,
+/* TRUNC_F64 */ f64_func_f64,
+/* TRUNC_F80 */ unsupported,
+/* TRUNC_F128 */ func_iPTR_i64_i64,
+/* TRUNC_PPCF128 */ unsupported,
+/* RINT_F32 */ f32_func_f32,
+/* RINT_F64 */ f64_func_f64,
+/* RINT_F80 */ unsupported,
+/* RINT_F128 */ func_iPTR_i64_i64,
+/* RINT_PPCF128 */ unsupported,
+/* NEARBYINT_F32 */ f32_func_f32,
+/* NEARBYINT_F64 */ f64_func_f64,
+/* NEARBYINT_F80 */ unsupported,
+/* NEARBYINT_F128 */ func_iPTR_i64_i64,
+/* NEARBYINT_PPCF128 */ unsupported,
+/* ROUND_F32 */ f32_func_f32,
+/* ROUND_F64 */ f64_func_f64,
+/* ROUND_F80 */ unsupported,
+/* ROUND_F128 */ func_iPTR_i64_i64,
+/* ROUND_PPCF128 */ unsupported,
+/* FLOOR_F32 */ f32_func_f32,
+/* FLOOR_F64 */ f64_func_f64,
+/* FLOOR_F80 */ unsupported,
+/* FLOOR_F128 */ func_iPTR_i64_i64,
+/* FLOOR_PPCF128 */ unsupported,
+/* COPYSIGN_F32 */ f32_func_f32_f32,
+/* COPYSIGN_F64 */ f64_func_f64_f64,
+/* COPYSIGN_F80 */ unsupported,
+/* COPYSIGN_F128 */ func_iPTR_i64_i64_i64_i64,
+/* COPYSIGN_PPCF128 */ unsupported,
+/* FMIN_F32 */ f32_func_f32_f32,
+/* FMIN_F64 */ f64_func_f64_f64,
+/* FMIN_F80 */ unsupported,
+/* FMIN_F128 */ func_iPTR_i64_i64_i64_i64,
+/* FMIN_PPCF128 */ unsupported,
+/* FMAX_F32 */ f32_func_f32_f32,
+/* FMAX_F64 */ f64_func_f64_f64,
+/* FMAX_F80 */ unsupported,
+/* FMAX_F128 */ func_iPTR_i64_i64_i64_i64,
+/* FMAX_PPCF128 */ unsupported,
+
+// CONVERSION
+/* FPEXT_F32_PPCF128 */ unsupported,
+/* FPEXT_F64_PPCF128 */ unsupported,
+/* FPEXT_F64_F128 */ func_iPTR_f64,
+/* FPEXT_F32_F128 */ func_iPTR_f32,
+/* FPEXT_F32_F64 */ f64_func_f32,
+/* FPEXT_F16_F32 */ f32_func_i16,
+/* FPROUND_F32_F16 */ i16_func_f32,
+/* FPROUND_F64_F16 */ unsupported,
+/* FPROUND_F80_F16 */ unsupported,
+/* FPROUND_F128_F16 */ unsupported,
+/* FPROUND_PPCF128_F16 */ unsupported,
+/* FPROUND_F64_F32 */ f32_func_f64,
+/* FPROUND_F80_F32 */ unsupported,
+/* FPROUND_F128_F32 */ f32_func_i64_i64,
+/* FPROUND_PPCF128_F32 */ unsupported,
+/* FPROUND_F80_F64 */ unsupported,
+/* FPROUND_F128_F64 */ f64_func_i64_i64,
+/* FPROUND_PPCF128_F64 */ unsupported,
+/* FPTOSINT_F32_I32 */ i32_func_f32,
+/* FPTOSINT_F32_I64 */ i64_func_f32,
+/* FPTOSINT_F32_I128 */ i64_i64_func_f32,
+/* FPTOSINT_F64_I32 */ i32_func_f64,
+/* FPTOSINT_F64_I64 */ i64_func_f64,
+/* FPTOSINT_F64_I128 */ i64_i64_func_f64,
+/* FPTOSINT_F80_I32 */ unsupported,
+/* FPTOSINT_F80_I64 */ unsupported,
+/* FPTOSINT_F80_I128 */ unsupported,
+/* FPTOSINT_F128_I32 */ i32_func_i64_i64,
+/* FPTOSINT_F128_I64 */ i64_func_i64_i64,
+/* FPTOSINT_F128_I128 */ i64_i64_func_i64_i64,
+/* FPTOSINT_PPCF128_I32 */ unsupported,
+/* FPTOSINT_PPCF128_I64 */ unsupported,
+/* FPTOSINT_PPCF128_I128 */ unsupported,
+/* FPTOUINT_F32_I32 */ i32_func_f32,
+/* FPTOUINT_F32_I64 */ i64_func_f32,
+/* FPTOUINT_F32_I128 */ i64_i64_func_f32,
+/* FPTOUINT_F64_I32 */ i32_func_f64,
+/* FPTOUINT_F64_I64 */ i64_func_f64,
+/* FPTOUINT_F64_I128 */ i64_i64_func_f64,
+/* FPTOUINT_F80_I32 */ unsupported,
+/* FPTOUINT_F80_I64 */ unsupported,
+/* FPTOUINT_F80_I128 */ unsupported,
+/* FPTOUINT_F128_I32 */ i32_func_i64_i64,
+/* FPTOUINT_F128_I64 */ i64_func_i64_i64,
+/* FPTOUINT_F128_I128 */ i64_i64_func_i64_i64,
+/* FPTOUINT_PPCF128_I32 */ unsupported,
+/* FPTOUINT_PPCF128_I64 */ unsupported,
+/* FPTOUINT_PPCF128_I128 */ unsupported,
+/* SINTTOFP_I32_F32 */ f32_func_i32,
+/* SINTTOFP_I32_F64 */ f64_func_i32,
+/* SINTTOFP_I32_F80 */ unsupported,
+/* SINTTOFP_I32_F128 */ func_iPTR_i32,
+/* SINTTOFP_I32_PPCF128 */ unsupported,
+/* SINTTOFP_I64_F32 */ f32_func_i64,
+/* SINTTOFP_I64_F64 */ f64_func_i64,
+/* SINTTOFP_I64_F80 */ unsupported,
+/* SINTTOFP_I64_F128 */ func_iPTR_i64,
+/* SINTTOFP_I64_PPCF128 */ unsupported,
+/* SINTTOFP_I128_F32 */ f32_func_i64_i64,
+/* SINTTOFP_I128_F64 */ f64_func_i64_i64,
+/* SINTTOFP_I128_F80 */ unsupported,
+/* SINTTOFP_I128_F128 */ func_iPTR_i64_i64,
+/* SINTTOFP_I128_PPCF128 */ unsupported,
+/* UINTTOFP_I32_F32 */ f32_func_i32,
+/* UINTTOFP_I32_F64 */ f64_func_i64,
+/* UINTTOFP_I32_F80 */ unsupported,
+/* UINTTOFP_I32_F128 */ func_iPTR_i32,
+/* UINTTOFP_I32_PPCF128 */ unsupported,
+/* UINTTOFP_I64_F32 */ f32_func_i64,
+/* UINTTOFP_I64_F64 */ f64_func_i64,
+/* UINTTOFP_I64_F80 */ unsupported,
+/* UINTTOFP_I64_F128 */ func_iPTR_i64,
+/* UINTTOFP_I64_PPCF128 */ unsupported,
+/* UINTTOFP_I128_F32 */ f32_func_i64_i64,
+/* UINTTOFP_I128_F64 */ f64_func_i64_i64,
+/* UINTTOFP_I128_F80 */ unsupported,
+/* UINTTOFP_I128_F128 */ func_iPTR_i64_i64,
+/* UINTTOFP_I128_PPCF128 */ unsupported,
+
+// COMPARISON
+/* OEQ_F32 */ i32_func_f32_f32,
+/* OEQ_F64 */ i32_func_f64_f64,
+/* OEQ_F128 */ i32_func_i64_i64_i64_i64,
+/* OEQ_PPCF128 */ unsupported,
+/* UNE_F32 */ i32_func_f32_f32,
+/* UNE_F64 */ i32_func_f64_f64,
+/* UNE_F128 */ i32_func_i64_i64_i64_i64,
+/* UNE_PPCF128 */ unsupported,
+/* OGE_F32 */ i32_func_f32_f32,
+/* OGE_F64 */ i32_func_f64_f64,
+/* OGE_F128 */ i32_func_i64_i64_i64_i64,
+/* OGE_PPCF128 */ unsupported,
+/* OLT_F32 */ i32_func_f32_f32,
+/* OLT_F64 */ i32_func_f64_f64,
+/* OLT_F128 */ i32_func_i64_i64_i64_i64,
+/* OLT_PPCF128 */ unsupported,
+/* OLE_F32 */ i32_func_f32_f32,
+/* OLE_F64 */ i32_func_f64_f64,
+/* OLE_F128 */ i32_func_i64_i64_i64_i64,
+/* OLE_PPCF128 */ unsupported,
+/* OGT_F32 */ i32_func_f32_f32,
+/* OGT_F64 */ i32_func_f64_f64,
+/* OGT_F128 */ i32_func_i64_i64_i64_i64,
+/* OGT_PPCF128 */ unsupported,
+/* UO_F32 */ i32_func_f32_f32,
+/* UO_F64 */ i32_func_f64_f64,
+/* UO_F128 */ i32_func_i64_i64_i64_i64,
+/* UO_PPCF128 */ unsupported,
+/* O_F32 */ i32_func_f32_f32,
+/* O_F64 */ i32_func_f64_f64,
+/* O_F128 */ i32_func_i64_i64_i64_i64,
+/* O_PPCF128 */ unsupported,
+
+// MEMORY
+/* MEMCPY */ iPTR_func_iPTR_iPTR_iPTR,
+/* MEMSET */ iPTR_func_iPTR_i32_iPTR,
+/* MEMMOVE */ iPTR_func_iPTR_iPTR_iPTR,
+
+// ELEMENT-WISE ATOMIC MEMORY
+/* MEMCPY_ELEMENT_ATOMIC_1 */ iPTR_func_iPTR_iPTR_iPTR,
+/* MEMCPY_ELEMENT_ATOMIC_2 */ iPTR_func_iPTR_iPTR_iPTR,
+/* MEMCPY_ELEMENT_ATOMIC_4 */ iPTR_func_iPTR_iPTR_iPTR,
+/* MEMCPY_ELEMENT_ATOMIC_8 */ iPTR_func_iPTR_iPTR_iPTR,
+/* MEMCPY_ELEMENT_ATOMIC_16 */ iPTR_func_iPTR_iPTR_iPTR,
+
+// EXCEPTION HANDLING
+/* UNWIND_RESUME */ unsupported,
+
+// Note: there's two sets of atomics libcalls; see
+// <http://llvm.org/docs/Atomics.html> for more info on the
+// difference between them.
+
+// Atomic '__sync_*' libcalls.
+/* SYNC_VAL_COMPARE_AND_SWAP_1 */ unsupported,
+/* SYNC_VAL_COMPARE_AND_SWAP_2 */ unsupported,
+/* SYNC_VAL_COMPARE_AND_SWAP_4 */ unsupported,
+/* SYNC_VAL_COMPARE_AND_SWAP_8 */ unsupported,
+/* SYNC_VAL_COMPARE_AND_SWAP_16 */ unsupported,
+/* SYNC_LOCK_TEST_AND_SET_1 */ unsupported,
+/* SYNC_LOCK_TEST_AND_SET_2 */ unsupported,
+/* SYNC_LOCK_TEST_AND_SET_4 */ unsupported,
+/* SYNC_LOCK_TEST_AND_SET_8 */ unsupported,
+/* SYNC_LOCK_TEST_AND_SET_16 */ unsupported,
+/* SYNC_FETCH_AND_ADD_1 */ unsupported,
+/* SYNC_FETCH_AND_ADD_2 */ unsupported,
+/* SYNC_FETCH_AND_ADD_4 */ unsupported,
+/* SYNC_FETCH_AND_ADD_8 */ unsupported,
+/* SYNC_FETCH_AND_ADD_16 */ unsupported,
+/* SYNC_FETCH_AND_SUB_1 */ unsupported,
+/* SYNC_FETCH_AND_SUB_2 */ unsupported,
+/* SYNC_FETCH_AND_SUB_4 */ unsupported,
+/* SYNC_FETCH_AND_SUB_8 */ unsupported,
+/* SYNC_FETCH_AND_SUB_16 */ unsupported,
+/* SYNC_FETCH_AND_AND_1 */ unsupported,
+/* SYNC_FETCH_AND_AND_2 */ unsupported,
+/* SYNC_FETCH_AND_AND_4 */ unsupported,
+/* SYNC_FETCH_AND_AND_8 */ unsupported,
+/* SYNC_FETCH_AND_AND_16 */ unsupported,
+/* SYNC_FETCH_AND_OR_1 */ unsupported,
+/* SYNC_FETCH_AND_OR_2 */ unsupported,
+/* SYNC_FETCH_AND_OR_4 */ unsupported,
+/* SYNC_FETCH_AND_OR_8 */ unsupported,
+/* SYNC_FETCH_AND_OR_16 */ unsupported,
+/* SYNC_FETCH_AND_XOR_1 */ unsupported,
+/* SYNC_FETCH_AND_XOR_2 */ unsupported,
+/* SYNC_FETCH_AND_XOR_4 */ unsupported,
+/* SYNC_FETCH_AND_XOR_8 */ unsupported,
+/* SYNC_FETCH_AND_XOR_16 */ unsupported,
+/* SYNC_FETCH_AND_NAND_1 */ unsupported,
+/* SYNC_FETCH_AND_NAND_2 */ unsupported,
+/* SYNC_FETCH_AND_NAND_4 */ unsupported,
+/* SYNC_FETCH_AND_NAND_8 */ unsupported,
+/* SYNC_FETCH_AND_NAND_16 */ unsupported,
+/* SYNC_FETCH_AND_MAX_1 */ unsupported,
+/* SYNC_FETCH_AND_MAX_2 */ unsupported,
+/* SYNC_FETCH_AND_MAX_4 */ unsupported,
+/* SYNC_FETCH_AND_MAX_8 */ unsupported,
+/* SYNC_FETCH_AND_MAX_16 */ unsupported,
+/* SYNC_FETCH_AND_UMAX_1 */ unsupported,
+/* SYNC_FETCH_AND_UMAX_2 */ unsupported,
+/* SYNC_FETCH_AND_UMAX_4 */ unsupported,
+/* SYNC_FETCH_AND_UMAX_8 */ unsupported,
+/* SYNC_FETCH_AND_UMAX_16 */ unsupported,
+/* SYNC_FETCH_AND_MIN_1 */ unsupported,
+/* SYNC_FETCH_AND_MIN_2 */ unsupported,
+/* SYNC_FETCH_AND_MIN_4 */ unsupported,
+/* SYNC_FETCH_AND_MIN_8 */ unsupported,
+/* SYNC_FETCH_AND_MIN_16 */ unsupported,
+/* SYNC_FETCH_AND_UMIN_1 */ unsupported,
+/* SYNC_FETCH_AND_UMIN_2 */ unsupported,
+/* SYNC_FETCH_AND_UMIN_4 */ unsupported,
+/* SYNC_FETCH_AND_UMIN_8 */ unsupported,
+/* SYNC_FETCH_AND_UMIN_16 */ unsupported,
+
+// Atomic '__atomic_*' libcalls.
+/* ATOMIC_LOAD */ unsupported,
+/* ATOMIC_LOAD_1 */ unsupported,
+/* ATOMIC_LOAD_2 */ unsupported,
+/* ATOMIC_LOAD_4 */ unsupported,
+/* ATOMIC_LOAD_8 */ unsupported,
+/* ATOMIC_LOAD_16 */ unsupported,
+
+/* ATOMIC_STORE */ unsupported,
+/* ATOMIC_STORE_1 */ unsupported,
+/* ATOMIC_STORE_2 */ unsupported,
+/* ATOMIC_STORE_4 */ unsupported,
+/* ATOMIC_STORE_8 */ unsupported,
+/* ATOMIC_STORE_16 */ unsupported,
+
+/* ATOMIC_EXCHANGE */ unsupported,
+/* ATOMIC_EXCHANGE_1 */ unsupported,
+/* ATOMIC_EXCHANGE_2 */ unsupported,
+/* ATOMIC_EXCHANGE_4 */ unsupported,
+/* ATOMIC_EXCHANGE_8 */ unsupported,
+/* ATOMIC_EXCHANGE_16 */ unsupported,
+
+/* ATOMIC_COMPARE_EXCHANGE */ unsupported,
+/* ATOMIC_COMPARE_EXCHANGE_1 */ unsupported,
+/* ATOMIC_COMPARE_EXCHANGE_2 */ unsupported,
+/* ATOMIC_COMPARE_EXCHANGE_4 */ unsupported,
+/* ATOMIC_COMPARE_EXCHANGE_8 */ unsupported,
+/* ATOMIC_COMPARE_EXCHANGE_16 */ unsupported,
+
+/* ATOMIC_FETCH_ADD_1 */ unsupported,
+/* ATOMIC_FETCH_ADD_2 */ unsupported,
+/* ATOMIC_FETCH_ADD_4 */ unsupported,
+/* ATOMIC_FETCH_ADD_8 */ unsupported,
+/* ATOMIC_FETCH_ADD_16 */ unsupported,
+
+/* ATOMIC_FETCH_SUB_1 */ unsupported,
+/* ATOMIC_FETCH_SUB_2 */ unsupported,
+/* ATOMIC_FETCH_SUB_4 */ unsupported,
+/* ATOMIC_FETCH_SUB_8 */ unsupported,
+/* ATOMIC_FETCH_SUB_16 */ unsupported,
+
+/* ATOMIC_FETCH_AND_1 */ unsupported,
+/* ATOMIC_FETCH_AND_2 */ unsupported,
+/* ATOMIC_FETCH_AND_4 */ unsupported,
+/* ATOMIC_FETCH_AND_8 */ unsupported,
+/* ATOMIC_FETCH_AND_16 */ unsupported,
+
+/* ATOMIC_FETCH_OR_1 */ unsupported,
+/* ATOMIC_FETCH_OR_2 */ unsupported,
+/* ATOMIC_FETCH_OR_4 */ unsupported,
+/* ATOMIC_FETCH_OR_8 */ unsupported,
+/* ATOMIC_FETCH_OR_16 */ unsupported,
+
+/* ATOMIC_FETCH_XOR_1 */ unsupported,
+/* ATOMIC_FETCH_XOR_2 */ unsupported,
+/* ATOMIC_FETCH_XOR_4 */ unsupported,
+/* ATOMIC_FETCH_XOR_8 */ unsupported,
+/* ATOMIC_FETCH_XOR_16 */ unsupported,
+
+/* ATOMIC_FETCH_NAND_1 */ unsupported,
+/* ATOMIC_FETCH_NAND_2 */ unsupported,
+/* ATOMIC_FETCH_NAND_4 */ unsupported,
+/* ATOMIC_FETCH_NAND_8 */ unsupported,
+/* ATOMIC_FETCH_NAND_16 */ unsupported,
+
+// Stack Protector Fail.
+/* STACKPROTECTOR_CHECK_FAIL */ func,
+
+// Deoptimization.
+/* DEOPTIMIZE */ unsupported,
+
+};
+
+static const char *
+RuntimeLibcallNames[RTLIB::UNKNOWN_LIBCALL] = {
+/* SHL_I16 */ "__ashlhi3",
+/* SHL_I32 */ "__ashlsi3",
+/* SHL_I64 */ "__ashldi3",
+/* SHL_I128 */ "__ashlti3",
+/* SRL_I16 */ "__lshrhi3",
+/* SRL_I32 */ "__lshrsi3",
+/* SRL_I64 */ "__lshrdi3",
+/* SRL_I128 */ "__lshrti3",
+/* SRA_I16 */ "__ashrhi3",
+/* SRA_I32 */ "__ashrsi3",
+/* SRA_I64 */ "__ashrdi3",
+/* SRA_I128 */ "__ashrti3",
+/* MUL_I8 */ "__mulqi3",
+/* MUL_I16 */ "__mulhi3",
+/* MUL_I32 */ "__mulsi3",
+/* MUL_I64 */ "__muldi3",
+/* MUL_I128 */ "__multi3",
+/* MULO_I32 */ "__mulosi4",
+/* MULO_I64 */ "__mulodi4",
+/* MULO_I128 */ "__muloti4",
+/* SDIV_I8 */ "__divqi3",
+/* SDIV_I16 */ "__divhi3",
+/* SDIV_I32 */ "__divsi3",
+/* SDIV_I64 */ "__divdi3",
+/* SDIV_I128 */ "__divti3",
+/* UDIV_I8 */ "__udivqi3",
+/* UDIV_I16 */ "__udivhi3",
+/* UDIV_I32 */ "__udivsi3",
+/* UDIV_I64 */ "__udivdi3",
+/* UDIV_I128 */ "__udivti3",
+/* SREM_I8 */ "__modqi3",
+/* SREM_I16 */ "__modhi3",
+/* SREM_I32 */ "__modsi3",
+/* SREM_I64 */ "__moddi3",
+/* SREM_I128 */ "__modti3",
+/* UREM_I8 */ "__umodqi3",
+/* UREM_I16 */ "__umodhi3",
+/* UREM_I32 */ "__umodsi3",
+/* UREM_I64 */ "__umoddi3",
+/* UREM_I128 */ "__umodti3",
+/* SDIVREM_I8 */ nullptr,
+/* SDIVREM_I16 */ nullptr,
+/* SDIVREM_I32 */ nullptr,
+/* SDIVREM_I64 */ nullptr,
+/* SDIVREM_I128 */ nullptr,
+/* UDIVREM_I8 */ nullptr,
+/* UDIVREM_I16 */ nullptr,
+/* UDIVREM_I32 */ nullptr,
+/* UDIVREM_I64 */ nullptr,
+/* UDIVREM_I128 */ nullptr,
+/* NEG_I32 */ "__negsi2",
+/* NEG_I64 */ "__negdi2",
+/* ADD_F32 */ "__addsf3",
+/* ADD_F64 */ "__adddf3",
+/* ADD_F80 */ nullptr,
+/* ADD_F128 */ "__addtf3",
+/* ADD_PPCF128 */ nullptr,
+/* SUB_F32 */ "__subsf3",
+/* SUB_F64 */ "__subdf3",
+/* SUB_F80 */ nullptr,
+/* SUB_F128 */ "__subtf3",
+/* SUB_PPCF128 */ nullptr,
+/* MUL_F32 */ "__mulsf3",
+/* MUL_F64 */ "__muldf3",
+/* MUL_F80 */ nullptr,
+/* MUL_F128 */ "__multf3",
+/* MUL_PPCF128 */ nullptr,
+/* DIV_F32 */ "__divsf3",
+/* DIV_F64 */ "__divdf3",
+/* DIV_F80 */ nullptr,
+/* DIV_F128 */ "__divtf3",
+/* DIV_PPCF128 */ nullptr,
+/* REM_F32 */ "fmodf",
+/* REM_F64 */ "fmod",
+/* REM_F80 */ nullptr,
+/* REM_F128 */ "fmodl",
+/* REM_PPCF128 */ nullptr,
+/* FMA_F32 */ "fmaf",
+/* FMA_F64 */ "fma",
+/* FMA_F80 */ nullptr,
+/* FMA_F128 */ "fmal",
+/* FMA_PPCF128 */ nullptr,
+/* POWI_F32 */ "__powisf2",
+/* POWI_F64 */ "__powidf2",
+/* POWI_F80 */ nullptr,
+/* POWI_F128 */ "__powitf2",
+/* POWI_PPCF128 */ nullptr,
+/* SQRT_F32 */ "sqrtf",
+/* SQRT_F64 */ "sqrt",
+/* SQRT_F80 */ nullptr,
+/* SQRT_F128 */ "sqrtl",
+/* SQRT_PPCF128 */ nullptr,
+/* LOG_F32 */ "logf",
+/* LOG_F64 */ "log",
+/* LOG_F80 */ nullptr,
+/* LOG_F128 */ "logl",
+/* LOG_PPCF128 */ nullptr,
+/* LOG2_F32 */ "log2f",
+/* LOG2_F64 */ "log2",
+/* LOG2_F80 */ nullptr,
+/* LOG2_F128 */ "log2l",
+/* LOG2_PPCF128 */ nullptr,
+/* LOG10_F32 */ "log10f",
+/* LOG10_F64 */ "log10",
+/* LOG10_F80 */ nullptr,
+/* LOG10_F128 */ "log10l",
+/* LOG10_PPCF128 */ nullptr,
+/* EXP_F32 */ "expf",
+/* EXP_F64 */ "exp",
+/* EXP_F80 */ nullptr,
+/* EXP_F128 */ "expl",
+/* EXP_PPCF128 */ nullptr,
+/* EXP2_F32 */ "exp2f",
+/* EXP2_F64 */ "exp2",
+/* EXP2_F80 */ nullptr,
+/* EXP2_F128 */ "exp2l",
+/* EXP2_PPCF128 */ nullptr,
+/* SIN_F32 */ "sinf",
+/* SIN_F64 */ "sin",
+/* SIN_F80 */ nullptr,
+/* SIN_F128 */ "sinl",
+/* SIN_PPCF128 */ nullptr,
+/* COS_F32 */ "cosf",
+/* COS_F64 */ "cos",
+/* COS_F80 */ nullptr,
+/* COS_F128 */ "cosl",
+/* COS_PPCF128 */ nullptr,
+/* SINCOS_F32 */ "sincosf",
+/* SINCOS_F64 */ "sincos",
+/* SINCOS_F80 */ nullptr,
+/* SINCOS_F128 */ "sincosl",
+/* SINCOS_PPCF128 */ nullptr,
+/* POW_F32 */ "powf",
+/* POW_F64 */ "pow",
+/* POW_F80 */ nullptr,
+/* POW_F128 */ "powl",
+/* POW_PPCF128 */ nullptr,
+/* CEIL_F32 */ "ceilf",
+/* CEIL_F64 */ "ceil",
+/* CEIL_F80 */ nullptr,
+/* CEIL_F128 */ "ceill",
+/* CEIL_PPCF128 */ nullptr,
+/* TRUNC_F32 */ "truncf",
+/* TRUNC_F64 */ "trunc",
+/* TRUNC_F80 */ nullptr,
+/* TRUNC_F128 */ "truncl",
+/* TRUNC_PPCF128 */ nullptr,
+/* RINT_F32 */ "rintf",
+/* RINT_F64 */ "rint",
+/* RINT_F80 */ nullptr,
+/* RINT_F128 */ "rintl",
+/* RINT_PPCF128 */ nullptr,
+/* NEARBYINT_F32 */ "nearbyintf",
+/* NEARBYINT_F64 */ "nearbyint",
+/* NEARBYINT_F80 */ nullptr,
+/* NEARBYINT_F128 */ "nearbyintl",
+/* NEARBYINT_PPCF128 */ nullptr,
+/* ROUND_F32 */ "roundf",
+/* ROUND_F64 */ "round",
+/* ROUND_F80 */ nullptr,
+/* ROUND_F128 */ "roundl",
+/* ROUND_PPCF128 */ nullptr,
+/* FLOOR_F32 */ "floorf",
+/* FLOOR_F64 */ "floor",
+/* FLOOR_F80 */ nullptr,
+/* FLOOR_F128 */ "floorl",
+/* FLOOR_PPCF128 */ nullptr,
+/* COPYSIGN_F32 */ "copysignf",
+/* COPYSIGN_F64 */ "copysign",
+/* COPYSIGN_F80 */ nullptr,
+/* COPYSIGN_F128 */ "copysignl",
+/* COPYSIGN_PPCF128 */ nullptr,
+/* FMIN_F32 */ "fminf",
+/* FMIN_F64 */ "fmin",
+/* FMIN_F80 */ nullptr,
+/* FMIN_F128 */ "fminl",
+/* FMIN_PPCF128 */ nullptr,
+/* FMAX_F32 */ "fmaxf",
+/* FMAX_F64 */ "fmax",
+/* FMAX_F80 */ nullptr,
+/* FMAX_F128 */ "fmaxl",
+/* FMAX_PPCF128 */ nullptr,
+/* FPEXT_F32_PPCF128 */ nullptr,
+/* FPEXT_F64_PPCF128 */ nullptr,
+/* FPEXT_F64_F128 */ "__extenddftf2",
+/* FPEXT_F32_F128 */ "__extendsftf2",
+/* FPEXT_F32_F64 */ "__extendsfdf2",
+/* FPEXT_F16_F32 */ "__gnu_h2f_ieee",
+/* FPROUND_F32_F16 */ "__gnu_f2h_ieee",
+/* FPROUND_F64_F16 */ nullptr,
+/* FPROUND_F80_F16 */ nullptr,
+/* FPROUND_F128_F16 */ nullptr,
+/* FPROUND_PPCF128_F16 */ nullptr,
+/* FPROUND_F64_F32 */ "__truncdfsf2",
+/* FPROUND_F80_F32 */ "__truncxfsf2",
+/* FPROUND_F128_F32 */ "__trunctfsf2",
+/* FPROUND_PPCF128_F32 */ nullptr,
+/* FPROUND_F80_F64 */ "__truncxfdf2",
+/* FPROUND_F128_F64 */ "__trunctfdf2",
+/* FPROUND_PPCF128_F64 */ nullptr,
+/* FPTOSINT_F32_I32 */ "__fixsfsi",
+/* FPTOSINT_F32_I64 */ "__fixsfdi",
+/* FPTOSINT_F32_I128 */ "__fixsfti",
+/* FPTOSINT_F64_I32 */ "__fixdfsi",
+/* FPTOSINT_F64_I64 */ "__fixdfdi",
+/* FPTOSINT_F64_I128 */ "__fixdfti",
+/* FPTOSINT_F80_I32 */ "__fixxfsi",
+/* FPTOSINT_F80_I64 */ "__fixxfdi",
+/* FPTOSINT_F80_I128 */ "__fixxfti",
+/* FPTOSINT_F128_I32 */ "__fixtfsi",
+/* FPTOSINT_F128_I64 */ "__fixtfdi",
+/* FPTOSINT_F128_I128 */ "__fixtfti",
+/* FPTOSINT_PPCF128_I32 */ nullptr,
+/* FPTOSINT_PPCF128_I64 */ nullptr,
+/* FPTOSINT_PPCF128_I128 */ nullptr,
+/* FPTOUINT_F32_I32 */ "__fixunssfsi",
+/* FPTOUINT_F32_I64 */ "__fixunssfdi",
+/* FPTOUINT_F32_I128 */ "__fixunssfti",
+/* FPTOUINT_F64_I32 */ "__fixunsdfsi",
+/* FPTOUINT_F64_I64 */ "__fixunsdfdi",
+/* FPTOUINT_F64_I128 */ "__fixunsdfti",
+/* FPTOUINT_F80_I32 */ "__fixunsxfsi",
+/* FPTOUINT_F80_I64 */ "__fixunsxfdi",
+/* FPTOUINT_F80_I128 */ "__fixunsxfti",
+/* FPTOUINT_F128_I32 */ "__fixunstfsi",
+/* FPTOUINT_F128_I64 */ "__fixunstfdi",
+/* FPTOUINT_F128_I128 */ "__fixunstfti",
+/* FPTOUINT_PPCF128_I32 */ nullptr,
+/* FPTOUINT_PPCF128_I64 */ nullptr,
+/* FPTOUINT_PPCF128_I128 */ nullptr,
+/* SINTTOFP_I32_F32 */ "__floatsisf",
+/* SINTTOFP_I32_F64 */ "__floatsidf",
+/* SINTTOFP_I32_F80 */ nullptr,
+/* SINTTOFP_I32_F128 */ "__floatsitf",
+/* SINTTOFP_I32_PPCF128 */ nullptr,
+/* SINTTOFP_I64_F32 */ "__floatdisf",
+/* SINTTOFP_I64_F64 */ "__floatdidf",
+/* SINTTOFP_I64_F80 */ nullptr,
+/* SINTTOFP_I64_F128 */ "__floatditf",
+/* SINTTOFP_I64_PPCF128 */ nullptr,
+/* SINTTOFP_I128_F32 */ "__floattisf",
+/* SINTTOFP_I128_F64 */ "__floattidf",
+/* SINTTOFP_I128_F80 */ nullptr,
+/* SINTTOFP_I128_F128 */ "__floattitf",
+/* SINTTOFP_I128_PPCF128 */ nullptr,
+/* UINTTOFP_I32_F32 */ "__floatunsisf",
+/* UINTTOFP_I32_F64 */ "__floatunsidf",
+/* UINTTOFP_I32_F80 */ nullptr,
+/* UINTTOFP_I32_F128 */ "__floatunsitf",
+/* UINTTOFP_I32_PPCF128 */ nullptr,
+/* UINTTOFP_I64_F32 */ "__floatundisf",
+/* UINTTOFP_I64_F64 */ "__floatundidf",
+/* UINTTOFP_I64_F80 */ nullptr,
+/* UINTTOFP_I64_F128 */ "__floatunditf",
+/* UINTTOFP_I64_PPCF128 */ nullptr,
+/* UINTTOFP_I128_F32 */ "__floatuntisf",
+/* UINTTOFP_I128_F64 */ "__floatuntidf",
+/* UINTTOFP_I128_F80 */ nullptr,
+/* UINTTOFP_I128_F128 */ "__floatuntitf",
+/* UINTTOFP_I128_PPCF128 */ nullptr,
+/* OEQ_F32 */ "__eqsf2",
+/* OEQ_F64 */ "__eqdf2",
+/* OEQ_F128 */ "__eqtf2",
+/* OEQ_PPCF128 */ nullptr,
+/* UNE_F32 */ "__nesf2",
+/* UNE_F64 */ "__nedf2",
+/* UNE_F128 */ "__netf2",
+/* UNE_PPCF128 */ nullptr,
+/* OGE_F32 */ "__gesf2",
+/* OGE_F64 */ "__gedf2",
+/* OGE_F128 */ "__getf2",
+/* OGE_PPCF128 */ nullptr,
+/* OLT_F32 */ "__ltsf2",
+/* OLT_F64 */ "__ltdf2",
+/* OLT_F128 */ "__lttf2",
+/* OLT_PPCF128 */ nullptr,
+/* OLE_F32 */ "__lesf2",
+/* OLE_F64 */ "__ledf2",
+/* OLE_F128 */ "__letf2",
+/* OLE_PPCF128 */ nullptr,
+/* OGT_F32 */ "__gtsf2",
+/* OGT_F64 */ "__gtdf2",
+/* OGT_F128 */ "__gttf2",
+/* OGT_PPCF128 */ nullptr,
+/* UO_F32 */ "__unordsf2",
+/* UO_F64 */ "__unorddf2",
+/* UO_F128 */ "__unordtf2",
+/* UO_PPCF128 */ nullptr,
+/* O_F32 */ "__unordsf2",
+/* O_F64 */ "__unorddf2",
+/* O_F128 */ "__unordtf2",
+/* O_PPCF128 */ nullptr,
+/* MEMCPY */ "memcpy",
+/* MEMMOVE */ "memset",
+/* MEMSET */ "memmove",
+/* MEMCPY_ELEMENT_ATOMIC_1 */ "MEMCPY_ELEMENT_ATOMIC_1",
+/* MEMCPY_ELEMENT_ATOMIC_2 */ "MEMCPY_ELEMENT_ATOMIC_2",
+/* MEMCPY_ELEMENT_ATOMIC_4 */ "MEMCPY_ELEMENT_ATOMIC_4",
+/* MEMCPY_ELEMENT_ATOMIC_8 */ "MEMCPY_ELEMENT_ATOMIC_8",
+/* MEMCPY_ELEMENT_ATOMIC_16 */ "MEMCPY_ELEMENT_ATOMIC_16",
+/* UNWIND_RESUME */ "_Unwind_Resume",
+/* SYNC_VAL_COMPARE_AND_SWAP_1 */ "__sync_val_compare_and_swap_1",
+/* SYNC_VAL_COMPARE_AND_SWAP_2 */ "__sync_val_compare_and_swap_2",
+/* SYNC_VAL_COMPARE_AND_SWAP_4 */ "__sync_val_compare_and_swap_4",
+/* SYNC_VAL_COMPARE_AND_SWAP_8 */ "__sync_val_compare_and_swap_8",
+/* SYNC_VAL_COMPARE_AND_SWAP_16 */ "__sync_val_compare_and_swap_16",
+/* SYNC_LOCK_TEST_AND_SET_1 */ "__sync_lock_test_and_set_1",
+/* SYNC_LOCK_TEST_AND_SET_2 */ "__sync_lock_test_and_set_2",
+/* SYNC_LOCK_TEST_AND_SET_4 */ "__sync_lock_test_and_set_4",
+/* SYNC_LOCK_TEST_AND_SET_8 */ "__sync_lock_test_and_set_8",
+/* SYNC_LOCK_TEST_AND_SET_16 */ "__sync_lock_test_and_set_16",
+/* SYNC_FETCH_AND_ADD_1 */ "__sync_fetch_and_add_1",
+/* SYNC_FETCH_AND_ADD_2 */ "__sync_fetch_and_add_2",
+/* SYNC_FETCH_AND_ADD_4 */ "__sync_fetch_and_add_4",
+/* SYNC_FETCH_AND_ADD_8 */ "__sync_fetch_and_add_8",
+/* SYNC_FETCH_AND_ADD_16 */ "__sync_fetch_and_add_16",
+/* SYNC_FETCH_AND_SUB_1 */ "__sync_fetch_and_sub_1",
+/* SYNC_FETCH_AND_SUB_2 */ "__sync_fetch_and_sub_2",
+/* SYNC_FETCH_AND_SUB_4 */ "__sync_fetch_and_sub_4",
+/* SYNC_FETCH_AND_SUB_8 */ "__sync_fetch_and_sub_8",
+/* SYNC_FETCH_AND_SUB_16 */ "__sync_fetch_and_sub_16",
+/* SYNC_FETCH_AND_AND_1 */ "__sync_fetch_and_and_1",
+/* SYNC_FETCH_AND_AND_2 */ "__sync_fetch_and_and_2",
+/* SYNC_FETCH_AND_AND_4 */ "__sync_fetch_and_and_4",
+/* SYNC_FETCH_AND_AND_8 */ "__sync_fetch_and_and_8",
+/* SYNC_FETCH_AND_AND_16 */ "__sync_fetch_and_and_16",
+/* SYNC_FETCH_AND_OR_1 */ "__sync_fetch_and_or_1",
+/* SYNC_FETCH_AND_OR_2 */ "__sync_fetch_and_or_2",
+/* SYNC_FETCH_AND_OR_4 */ "__sync_fetch_and_or_4",
+/* SYNC_FETCH_AND_OR_8 */ "__sync_fetch_and_or_8",
+/* SYNC_FETCH_AND_OR_16 */ "__sync_fetch_and_or_16",
+/* SYNC_FETCH_AND_XOR_1 */ "__sync_fetch_and_xor_1",
+/* SYNC_FETCH_AND_XOR_2 */ "__sync_fetch_and_xor_2",
+/* SYNC_FETCH_AND_XOR_4 */ "__sync_fetch_and_xor_4",
+/* SYNC_FETCH_AND_XOR_8 */ "__sync_fetch_and_xor_8",
+/* SYNC_FETCH_AND_XOR_16 */ "__sync_fetch_and_xor_16",
+/* SYNC_FETCH_AND_NAND_1 */ "__sync_fetch_and_nand_1",
+/* SYNC_FETCH_AND_NAND_2 */ "__sync_fetch_and_nand_2",
+/* SYNC_FETCH_AND_NAND_4 */ "__sync_fetch_and_nand_4",
+/* SYNC_FETCH_AND_NAND_8 */ "__sync_fetch_and_nand_8",
+/* SYNC_FETCH_AND_NAND_16 */ "__sync_fetch_and_nand_16",
+/* SYNC_FETCH_AND_MAX_1 */ "__sync_fetch_and_max_1",
+/* SYNC_FETCH_AND_MAX_2 */ "__sync_fetch_and_max_2",
+/* SYNC_FETCH_AND_MAX_4 */ "__sync_fetch_and_max_4",
+/* SYNC_FETCH_AND_MAX_8 */ "__sync_fetch_and_max_8",
+/* SYNC_FETCH_AND_MAX_16 */ "__sync_fetch_and_max_16",
+/* SYNC_FETCH_AND_UMAX_1 */ "__sync_fetch_and_umax_1",
+/* SYNC_FETCH_AND_UMAX_2 */ "__sync_fetch_and_umax_2",
+/* SYNC_FETCH_AND_UMAX_4 */ "__sync_fetch_and_umax_4",
+/* SYNC_FETCH_AND_UMAX_8 */ "__sync_fetch_and_umax_8",
+/* SYNC_FETCH_AND_UMAX_16 */ "__sync_fetch_and_umax_16",
+/* SYNC_FETCH_AND_MIN_1 */ "__sync_fetch_and_min_1",
+/* SYNC_FETCH_AND_MIN_2 */ "__sync_fetch_and_min_2",
+/* SYNC_FETCH_AND_MIN_4 */ "__sync_fetch_and_min_4",
+/* SYNC_FETCH_AND_MIN_8 */ "__sync_fetch_and_min_8",
+/* SYNC_FETCH_AND_MIN_16 */ "__sync_fetch_and_min_16",
+/* SYNC_FETCH_AND_UMIN_1 */ "__sync_fetch_and_umin_1",
+/* SYNC_FETCH_AND_UMIN_2 */ "__sync_fetch_and_umin_2",
+/* SYNC_FETCH_AND_UMIN_4 */ "__sync_fetch_and_umin_4",
+/* SYNC_FETCH_AND_UMIN_8 */ "__sync_fetch_and_umin_8",
+/* SYNC_FETCH_AND_UMIN_16 */ "__sync_fetch_and_umin_16",
+
+/* ATOMIC_LOAD */ "__atomic_load",
+/* ATOMIC_LOAD_1 */ "__atomic_load_1",
+/* ATOMIC_LOAD_2 */ "__atomic_load_2",
+/* ATOMIC_LOAD_4 */ "__atomic_load_4",
+/* ATOMIC_LOAD_8 */ "__atomic_load_8",
+/* ATOMIC_LOAD_16 */ "__atomic_load_16",
+
+/* ATOMIC_STORE */ "__atomic_store",
+/* ATOMIC_STORE_1 */ "__atomic_store_1",
+/* ATOMIC_STORE_2 */ "__atomic_store_2",
+/* ATOMIC_STORE_4 */ "__atomic_store_4",
+/* ATOMIC_STORE_8 */ "__atomic_store_8",
+/* ATOMIC_STORE_16 */ "__atomic_store_16",
+
+/* ATOMIC_EXCHANGE */ "__atomic_exchange",
+/* ATOMIC_EXCHANGE_1 */ "__atomic_exchange_1",
+/* ATOMIC_EXCHANGE_2 */ "__atomic_exchange_2",
+/* ATOMIC_EXCHANGE_4 */ "__atomic_exchange_4",
+/* ATOMIC_EXCHANGE_8 */ "__atomic_exchange_8",
+/* ATOMIC_EXCHANGE_16 */ "__atomic_exchange_16",
+
+/* ATOMIC_COMPARE_EXCHANGE */ "__atomic_compare_exchange",
+/* ATOMIC_COMPARE_EXCHANGE_1 */ "__atomic_compare_exchange_1",
+/* ATOMIC_COMPARE_EXCHANGE_2 */ "__atomic_compare_exchange_2",
+/* ATOMIC_COMPARE_EXCHANGE_4 */ "__atomic_compare_exchange_4",
+/* ATOMIC_COMPARE_EXCHANGE_8 */ "__atomic_compare_exchange_8",
+/* ATOMIC_COMPARE_EXCHANGE_16 */ "__atomic_compare_exchange_16",
+
+/* ATOMIC_FETCH_ADD_1 */ "__atomic_fetch_add_1",
+/* ATOMIC_FETCH_ADD_2 */ "__atomic_fetch_add_2",
+/* ATOMIC_FETCH_ADD_4 */ "__atomic_fetch_add_4",
+/* ATOMIC_FETCH_ADD_8 */ "__atomic_fetch_add_8",
+/* ATOMIC_FETCH_ADD_16 */ "__atomic_fetch_add_16",
+/* ATOMIC_FETCH_SUB_1 */ "__atomic_fetch_sub_1",
+/* ATOMIC_FETCH_SUB_2 */ "__atomic_fetch_sub_2",
+/* ATOMIC_FETCH_SUB_4 */ "__atomic_fetch_sub_4",
+/* ATOMIC_FETCH_SUB_8 */ "__atomic_fetch_sub_8",
+/* ATOMIC_FETCH_SUB_16 */ "__atomic_fetch_sub_16",
+/* ATOMIC_FETCH_AND_1 */ "__atomic_fetch_and_1",
+/* ATOMIC_FETCH_AND_2 */ "__atomic_fetch_and_2",
+/* ATOMIC_FETCH_AND_4 */ "__atomic_fetch_and_4",
+/* ATOMIC_FETCH_AND_8 */ "__atomic_fetch_and_8",
+/* ATOMIC_FETCH_AND_16 */ "__atomic_fetch_and_16",
+/* ATOMIC_FETCH_OR_1 */ "__atomic_fetch_or_1",
+/* ATOMIC_FETCH_OR_2 */ "__atomic_fetch_or_2",
+/* ATOMIC_FETCH_OR_4 */ "__atomic_fetch_or_4",
+/* ATOMIC_FETCH_OR_8 */ "__atomic_fetch_or_8",
+/* ATOMIC_FETCH_OR_16 */ "__atomic_fetch_or_16",
+/* ATOMIC_FETCH_XOR_1 */ "__atomic_fetch_xor_1",
+/* ATOMIC_FETCH_XOR_2 */ "__atomic_fetch_xor_2",
+/* ATOMIC_FETCH_XOR_4 */ "__atomic_fetch_xor_4",
+/* ATOMIC_FETCH_XOR_8 */ "__atomic_fetch_xor_8",
+/* ATOMIC_FETCH_XOR_16 */ "__atomic_fetch_xor_16",
+/* ATOMIC_FETCH_NAND_1 */ "__atomic_fetch_nand_1",
+/* ATOMIC_FETCH_NAND_2 */ "__atomic_fetch_nand_2",
+/* ATOMIC_FETCH_NAND_4 */ "__atomic_fetch_nand_4",
+/* ATOMIC_FETCH_NAND_8 */ "__atomic_fetch_nand_8",
+/* ATOMIC_FETCH_NAND_16 */ "__atomic_fetch_nand_16",
+
+/* STACKPROTECTOR_CHECK_FAIL */ "__stack_chk_fail",
+
+/* DEOPTIMIZE */ "__llvm_deoptimize",
+};
+
+void llvm::GetSignature(const WebAssemblySubtarget &Subtarget,
+                        RTLIB::Libcall LC,
+                        SmallVectorImpl<unsigned> &Rets,
+                        SmallVectorImpl<unsigned> &Params)
+{
+  assert(Rets.empty());
+  assert(Params.empty());
+
+  WebAssembly::ExprType iPTR = Subtarget.hasAddr64() ?
+                               WebAssembly::ExprType::I64 :
+                               WebAssembly::ExprType::I32;
+
+  switch (RuntimeLibcallSignatures[LC]) {
+  case func:
+    break;
+  case f32_func_f32:
+    Rets.push_back(unsigned(WebAssembly::ExprType::F32));
+    Params.push_back(unsigned(WebAssembly::ExprType::F32));
+    break;
+  case f32_func_f64:
+    Rets.push_back(unsigned(WebAssembly::ExprType::F32));
+    Params.push_back(unsigned(WebAssembly::ExprType::F64));
+    break;
+  case f32_func_i32:
+    Rets.push_back(unsigned(WebAssembly::ExprType::F32));
+    Params.push_back(unsigned(WebAssembly::ExprType::I32));
+    break;
+  case f32_func_i64:
+    Rets.push_back(unsigned(WebAssembly::ExprType::F32));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    break;
+  case f32_func_i16:
+    Rets.push_back(unsigned(WebAssembly::ExprType::F32));
+    Params.push_back(unsigned(WebAssembly::ExprType::I32));
+    break;
+  case f64_func_f32:
+    Rets.push_back(unsigned(WebAssembly::ExprType::F64));
+    Params.push_back(unsigned(WebAssembly::ExprType::F32));
+    break;
+  case f64_func_f64:
+    Rets.push_back(unsigned(WebAssembly::ExprType::F64));
+    Params.push_back(unsigned(WebAssembly::ExprType::F64));
+    break;
+  case f64_func_i32:
+    Rets.push_back(unsigned(WebAssembly::ExprType::F64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I32));
+    break;
+  case f64_func_i64:
+    Rets.push_back(unsigned(WebAssembly::ExprType::F64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    break;
+  case i32_func_f32:
+    Rets.push_back(unsigned(WebAssembly::ExprType::I32));
+    Params.push_back(unsigned(WebAssembly::ExprType::F32));
+    break;
+  case i32_func_f64:
+    Rets.push_back(unsigned(WebAssembly::ExprType::I32));
+    Params.push_back(unsigned(WebAssembly::ExprType::F64));
+    break;
+  case i32_func_i32:
+    Rets.push_back(unsigned(WebAssembly::ExprType::I32));
+    Params.push_back(unsigned(WebAssembly::ExprType::I32));
+    break;
+  case i64_func_f32:
+    Rets.push_back(unsigned(WebAssembly::ExprType::I64));
+    Params.push_back(unsigned(WebAssembly::ExprType::F32));
+    break;
+  case i64_func_f64:
+    Rets.push_back(unsigned(WebAssembly::ExprType::I64));
+    Params.push_back(unsigned(WebAssembly::ExprType::F64));
+    break;
+  case i64_func_i64:
+    Rets.push_back(unsigned(WebAssembly::ExprType::I64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    break;
+  case f32_func_f32_f32:
+    Rets.push_back(unsigned(WebAssembly::ExprType::F32));
+    Params.push_back(unsigned(WebAssembly::ExprType::F32));
+    Params.push_back(unsigned(WebAssembly::ExprType::F32));
+    break;
+  case f32_func_f32_i32:
+    Rets.push_back(unsigned(WebAssembly::ExprType::F32));
+    Params.push_back(unsigned(WebAssembly::ExprType::F32));
+    Params.push_back(unsigned(WebAssembly::ExprType::I32));
+    break;
+  case f32_func_i64_i64:
+    Rets.push_back(unsigned(WebAssembly::ExprType::F32));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    break;
+  case f64_func_f64_f64:
+    Rets.push_back(unsigned(WebAssembly::ExprType::F64));
+    Params.push_back(unsigned(WebAssembly::ExprType::F64));
+    Params.push_back(unsigned(WebAssembly::ExprType::F64));
+    break;
+  case f64_func_f64_i32:
+    Rets.push_back(unsigned(WebAssembly::ExprType::F64));
+    Params.push_back(unsigned(WebAssembly::ExprType::F64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I32));
+    break;
+  case f64_func_i64_i64:
+    Rets.push_back(unsigned(WebAssembly::ExprType::F64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    break;
+  case i16_func_f32:
+    Rets.push_back(unsigned(WebAssembly::ExprType::I32));
+    Params.push_back(unsigned(WebAssembly::ExprType::F32));
+    break;
+  case i8_func_i8_i8:
+    Rets.push_back(unsigned(WebAssembly::ExprType::I32));
+    Params.push_back(unsigned(WebAssembly::ExprType::I32));
+    Params.push_back(unsigned(WebAssembly::ExprType::I32));
+    break;
+  case func_f32_iPTR_iPTR:
+    Params.push_back(unsigned(WebAssembly::ExprType::F32));
+    Params.push_back(unsigned(iPTR));
+    Params.push_back(unsigned(iPTR));
+    break;
+  case func_f64_iPTR_iPTR:
+    Params.push_back(unsigned(WebAssembly::ExprType::F64));
+    Params.push_back(unsigned(iPTR));
+    Params.push_back(unsigned(iPTR));
+    break;
+  case i16_func_i16_i16:
+    Rets.push_back(unsigned(WebAssembly::ExprType::I32));
+    Params.push_back(unsigned(WebAssembly::ExprType::I32));
+    Params.push_back(unsigned(WebAssembly::ExprType::I32));
+    break;
+  case i32_func_f32_f32:
+    Rets.push_back(unsigned(WebAssembly::ExprType::I32));
+    Params.push_back(unsigned(WebAssembly::ExprType::F32));
+    Params.push_back(unsigned(WebAssembly::ExprType::F32));
+    break;
+  case i32_func_f64_f64:
+    Rets.push_back(unsigned(WebAssembly::ExprType::I32));
+    Params.push_back(unsigned(WebAssembly::ExprType::F64));
+    Params.push_back(unsigned(WebAssembly::ExprType::F64));
+    break;
+  case i32_func_i32_i32:
+    Rets.push_back(unsigned(WebAssembly::ExprType::I32));
+    Params.push_back(unsigned(WebAssembly::ExprType::I32));
+    Params.push_back(unsigned(WebAssembly::ExprType::I32));
+    break;
+  case i64_func_i64_i64:
+    Rets.push_back(unsigned(WebAssembly::ExprType::I64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    break;
+  case i64_i64_func_f32:
+#if 0 // TODO: Enable this when wasm gets multiple-return-value support.
+    Rets.push_back(unsigned(WebAssembly::ExprType::I64));
+    Rets.push_back(unsigned(WebAssembly::ExprType::I64));
+#else
+    Params.push_back(unsigned(iPTR));
+#endif
+    Params.push_back(unsigned(WebAssembly::ExprType::F32));
+    break;
+  case i64_i64_func_f64:
+#if 0 // TODO: Enable this when wasm gets multiple-return-value support.
+    Rets.push_back(unsigned(WebAssembly::ExprType::I64));
+    Rets.push_back(unsigned(WebAssembly::ExprType::I64));
+#else
+    Params.push_back(unsigned(iPTR));
+#endif
+    Params.push_back(unsigned(WebAssembly::ExprType::F64));
+    break;
+  case i16_i16_func_i16_i16:
+#if 0 // TODO: Enable this when wasm gets multiple-return-value support.
+    Rets.push_back(unsigned(WebAssembly::ExprType::I32));
+    Rets.push_back(unsigned(WebAssembly::ExprType::I32));
+#else
+    Params.push_back(unsigned(iPTR));
+#endif
+    Params.push_back(unsigned(WebAssembly::ExprType::I32));
+    Params.push_back(unsigned(WebAssembly::ExprType::I32));
+    break;
+  case i32_i32_func_i32_i32:
+#if 0 // TODO: Enable this when wasm gets multiple-return-value support.
+    Rets.push_back(unsigned(WebAssembly::ExprType::I32));
+    Rets.push_back(unsigned(WebAssembly::ExprType::I32));
+#else
+    Params.push_back(unsigned(iPTR));
+#endif
+    Params.push_back(unsigned(WebAssembly::ExprType::I32));
+    Params.push_back(unsigned(WebAssembly::ExprType::I32));
+    break;
+  case i64_i64_func_i64_i64:
+#if 0 // TODO: Enable this when wasm gets multiple-return-value support.
+    Rets.push_back(unsigned(WebAssembly::ExprType::I64));
+    Rets.push_back(unsigned(WebAssembly::ExprType::I64));
+#else
+    Params.push_back(unsigned(iPTR));
+#endif
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    break;
+  case i64_i64_func_i64_i64_i64_i64:
+#if 0 // TODO: Enable this when wasm gets multiple-return-value support.
+    Rets.push_back(unsigned(WebAssembly::ExprType::I64));
+    Rets.push_back(unsigned(WebAssembly::ExprType::I64));
+#else
+    Params.push_back(unsigned(iPTR));
+#endif
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    break;
+  case i64_i64_i64_i64_func_i64_i64_i64_i64:
+#if 0 // TODO: Enable this when wasm gets multiple-return-value support.
+    Rets.push_back(unsigned(WebAssembly::ExprType::I64));
+    Rets.push_back(unsigned(WebAssembly::ExprType::I64));
+    Rets.push_back(unsigned(WebAssembly::ExprType::I64));
+    Rets.push_back(unsigned(WebAssembly::ExprType::I64));
+#else
+    Params.push_back(unsigned(iPTR));
+#endif
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    break;
+  case i64_i64_func_i64_i64_i32:
+#if 0 // TODO: Enable this when wasm gets multiple-return-value support.
+    Rets.push_back(unsigned(WebAssembly::ExprType::I64));
+    Rets.push_back(unsigned(WebAssembly::ExprType::I64));
+    Rets.push_back(unsigned(WebAssembly::ExprType::I64));
+    Rets.push_back(unsigned(WebAssembly::ExprType::I64));
+#else
+    Params.push_back(unsigned(iPTR));
+#endif
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I32));
+    break;
+  case iPTR_func_iPTR_i32_iPTR:
+    Rets.push_back(unsigned(iPTR));
+    Params.push_back(unsigned(iPTR));
+    Params.push_back(unsigned(WebAssembly::ExprType::I32));
+    Params.push_back(unsigned(iPTR));
+    break;
+  case iPTR_func_iPTR_iPTR_iPTR:
+    Rets.push_back(unsigned(iPTR));
+    Params.push_back(unsigned(iPTR));
+    Params.push_back(unsigned(iPTR));
+    Params.push_back(unsigned(iPTR));
+    break;
+  case f32_func_f32_f32_f32:
+    Rets.push_back(unsigned(WebAssembly::ExprType::F32));
+    Params.push_back(unsigned(WebAssembly::ExprType::F32));
+    Params.push_back(unsigned(WebAssembly::ExprType::F32));
+    Params.push_back(unsigned(WebAssembly::ExprType::F32));
+    break;
+  case f64_func_f64_f64_f64:
+    Rets.push_back(unsigned(WebAssembly::ExprType::F64));
+    Params.push_back(unsigned(WebAssembly::ExprType::F64));
+    Params.push_back(unsigned(WebAssembly::ExprType::F64));
+    Params.push_back(unsigned(WebAssembly::ExprType::F64));
+    break;
+  case func_i64_i64_iPTR_iPTR:
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    Params.push_back(unsigned(iPTR));
+    Params.push_back(unsigned(iPTR));
+    break;
+  case func_iPTR_f32:
+    Params.push_back(unsigned(iPTR));
+    Params.push_back(unsigned(WebAssembly::ExprType::F32));
+    break;
+  case func_iPTR_f64:
+    Params.push_back(unsigned(iPTR));
+    Params.push_back(unsigned(WebAssembly::ExprType::F64));
+    break;
+  case func_iPTR_i32:
+    Params.push_back(unsigned(iPTR));
+    Params.push_back(unsigned(WebAssembly::ExprType::I32));
+    break;
+  case func_iPTR_i64:
+    Params.push_back(unsigned(iPTR));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    break;
+  case func_iPTR_i64_i64:
+    Params.push_back(unsigned(iPTR));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    break;
+  case func_iPTR_i64_i64_i64_i64:
+    Params.push_back(unsigned(iPTR));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    break;
+  case func_iPTR_i64_i64_i64_i64_i64_i64:
+    Params.push_back(unsigned(iPTR));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    break;
+  case i32_func_i64_i64:
+    Rets.push_back(unsigned(WebAssembly::ExprType::I32));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    break;
+  case i32_func_i64_i64_i64_i64:
+    Rets.push_back(unsigned(WebAssembly::ExprType::I32));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    Params.push_back(unsigned(WebAssembly::ExprType::I64));
+    break;
+  case unsupported:
+    llvm_unreachable("unsupported runtime library signature");
+  }
+}
+
+void llvm::GetSignature(const WebAssemblySubtarget &Subtarget,
+                        const char *Name,
+                        SmallVectorImpl<unsigned> &Rets,
+                        SmallVectorImpl<unsigned> &Params)
+{
+  assert(strcmp(RuntimeLibcallNames[RTLIB::DEOPTIMIZE], "__llvm_deoptimize") ==
+         0);
+
+  for (size_t i = 0, e = RTLIB::UNKNOWN_LIBCALL; i < e; ++i)
+    if (RuntimeLibcallNames[i] && strcmp(RuntimeLibcallNames[i], Name) == 0)
+      return GetSignature(Subtarget, RTLIB::Libcall(i), Rets, Params);
+
+  llvm_unreachable("unexpected runtime library name");
+}