[PowerPC] Add global named register support
Support for the intrinsics that read from and write to global named registers
is added for r1, r2 and r13 (depending on the subtarget).
llvm-svn: 208509
diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
index e5fa0d6..2fd5e10 100644
--- a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -18,6 +18,7 @@
#include "PPCTargetMachine.h"
#include "PPCTargetObjectFile.h"
#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/StringSwitch.h"
#include "llvm/CodeGen/CallingConvLower.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
@@ -8757,6 +8758,30 @@
return FrameAddr;
}
+// FIXME? Maybe this could be a TableGen attribute on some registers and
+// this table could be generated automatically from RegInfo.
+unsigned PPCTargetLowering::getRegisterByName(const char* RegName,
+ EVT VT) const {
+ bool isPPC64 = PPCSubTarget.isPPC64();
+ bool isDarwinABI = PPCSubTarget.isDarwinABI();
+
+ if ((isPPC64 && VT != MVT::i64 && VT != MVT::i32) ||
+ (!isPPC64 && VT != MVT::i32))
+ report_fatal_error("Invalid register global variable type");
+
+ bool is64Bit = isPPC64 && VT == MVT::i64;
+ unsigned Reg = StringSwitch<unsigned>(RegName)
+ .Case("r1", is64Bit ? PPC::X1 : PPC::R1)
+ .Case("r2", isDarwinABI ? 0 : (is64Bit ? PPC::X2 : PPC::R2))
+ .Case("r13", (!isPPC64 && isDarwinABI) ? 0 :
+ (is64Bit ? PPC::X13 : PPC::R13))
+ .Default(0);
+
+ if (Reg)
+ return Reg;
+ report_fatal_error("Invalid register name global variable");
+}
+
bool
PPCTargetLowering::isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const {
// The PowerPC target isn't yet aware of offsets.