From b3a6901e66f55b35aa9e01bcb24134e6a65ea004 Mon Sep 17 00:00:00 2001
From: Daniel Dunbar <daniel@zuster.org>
Date: Fri, 26 Jun 2009 16:47:03 +0000
Subject: Initial import of compiler-rt.  -

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@74292 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/i386/floatdidf.s | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 lib/i386/floatdidf.s

(limited to 'lib/i386/floatdidf.s')

diff --git a/lib/i386/floatdidf.s b/lib/i386/floatdidf.s
new file mode 100644
index 000000000..34736ac58
--- /dev/null
+++ b/lib/i386/floatdidf.s
@@ -0,0 +1,32 @@
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+
+// double __floatundidf(du_int a);
+
+#ifdef __i386__
+
+.const
+.align 4
+twop52: .quad 0x4330000000000000
+twop32: .quad 0x41f0000000000000
+
+#define REL_ADDR(_a)	(_a)-0b(%eax)
+
+.text
+.align 4
+.globl ___floatdidf
+___floatdidf:
+	cvtsi2sd	8(%esp),			%xmm1
+	movss		4(%esp),			%xmm0 // low 32 bits of a
+	calll		0f
+0:	popl		%eax
+	mulsd		REL_ADDR(twop32),	%xmm1 // a_hi as a double (without rounding)
+	movsd		REL_ADDR(twop52),	%xmm2 // 0x1.0p52
+	subsd		%xmm2,				%xmm1 // a_hi - 0x1p52 (no rounding occurs)
+	orpd		%xmm2,				%xmm0 // 0x1p52 + a_lo (no rounding occurs)
+	addsd		%xmm1,				%xmm0 // a_hi + a_lo   (round happens here)
+	movsd		%xmm0,			   4(%esp)
+	fldl	   4(%esp)
+	ret
+	
+#endif // __i386__
-- 
cgit v1.2.3