1 files changed, 33 insertions, 0 deletions
diff --git a/lib/x86_64/floatundisf.S b/lib/x86_64/floatundisf.S
new file mode 100644
index 000000000000..fe209632a38e
--- /dev/null
+++ b/lib/x86_64/floatundisf.S
@@ -0,0 +1,33 @@
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+
+#include "../assembly.h"
+
+// float __floatundisf(du_int a);
+
+#ifdef __x86_64__
+
+#ifndef __ELF__
+.literal4
+#endif
+two: .single 2.0
+
+#define REL_ADDR(_a)	(_a)(%rip)
+
+.text
+.align 4
+DEFINE_COMPILERRT_FUNCTION(__floatundisf)
+	movq		$1,			%rsi
+	testq		%rdi,		%rdi
+	js			1f
+	cvtsi2ssq	%rdi,		%xmm0
+	ret
+	
+1:	andq		%rdi,		%rsi
+	shrq		%rdi
+	orq			%rsi,		%rdi
+	cvtsi2ssq	%rdi,		%xmm0
+	mulss	REL_ADDR(two),	%xmm0
+	ret
+	
+#endif // __x86_64__