Initial import of compiler-rt.
-
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@74292 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/x86_64/floatundidf.s b/lib/x86_64/floatundidf.s
new file mode 100644
index 0000000..2eb8c7a
--- /dev/null
+++ b/lib/x86_64/floatundidf.s
@@ -0,0 +1,40 @@
+//===-- floatundidf.s - Implement __floatundidf for x86_64 ----------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements __floatundidf for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+// double __floatundidf(du_int a);
+
+#ifdef __x86_64__
+
+.const
+.align 4
+twop52: .quad 0x4330000000000000
+twop84_plus_twop52:
+ .quad 0x4530000000100000
+twop84: .quad 0x4530000000000000
+
+#define REL_ADDR(_a) (_a)(%rip)
+
+.text
+.align 4
+.globl ___floatundidf
+___floatundidf:
+ movd %edi, %xmm0 // low 32 bits of a
+ shrq $32, %rdi // high 32 bits of a
+ orq REL_ADDR(twop84), %rdi // 0x1p84 + a_hi (no rounding occurs)
+ orpd REL_ADDR(twop52), %xmm0 // 0x1p52 + a_lo (no rounding occurs)
+ movd %rdi, %xmm1
+ subsd REL_ADDR(twop84_plus_twop52), %xmm1 // a_hi - 0x1p52 (no rounding occurs)
+ addsd %xmm1, %xmm0 // a_hi + a_lo (round happens here)
+ ret
+
+#endif // __x86_64__
\ No newline at end of file