diff options
author | Daniel Dunbar <daniel@zuster.org> | 2009-06-26 16:47:03 +0000 |
---|---|---|
committer | Daniel Dunbar <daniel@zuster.org> | 2009-06-26 16:47:03 +0000 |
commit | b3a6901e66f55b35aa9e01bcb24134e6a65ea004 (patch) | |
tree | 4d57d73575ea3f7e30bf430920d6e96fa2a369c1 /lib/i386/floatdixf.s | |
parent | 8cbe163cba77c772621f89ddb33793ac170b1fa2 (diff) | |
download | compiler-rt-b3a6901e66f55b35aa9e01bcb24134e6a65ea004.tar.gz |
Initial import of compiler-rt.
-
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@74292 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/i386/floatdixf.s')
-rw-r--r-- | lib/i386/floatdixf.s | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/lib/i386/floatdixf.s b/lib/i386/floatdixf.s new file mode 100644 index 000000000..71e2d2abc --- /dev/null +++ b/lib/i386/floatdixf.s @@ -0,0 +1,28 @@ +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. + +// float __floatdixf(di_int a); + +#ifdef __i386__ + +// This routine has some extra memory traffic, loading the 64-bit input via two +// 32-bit loads, then immediately storing it back to the stack via a single 64-bit +// store. This is to avoid a write-small, read-large stall. +// However, if callers of this routine can be safely assumed to store the argument +// via a 64-bt store, this is unnecessary memory traffic, and should be avoided. +// It can be turned off by defining the TRUST_CALLERS_USE_64_BIT_STORES macro. + +.text +.align 4 +.globl ___floatdixf +___floatdixf: +#ifndef TRUST_CALLERS_USE_64_BIT_STORES + movd 4(%esp), %xmm0 + movd 8(%esp), %xmm1 + punpckldq %xmm1, %xmm0 + movq %xmm0, 4(%esp) +#endif + fildll 4(%esp) + ret + +#endif // __i386__
\ No newline at end of file |