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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45280 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2007-12-21 01:31:58 +00:00
parent 56bf2f8288
commit 0b0102b172
1 changed files with 15 additions and 0 deletions
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15
lib/Target/X86/README-SSE.txt
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@ -741,3 +741,18 @@ save, as a really-signed value would be undefined for pslld.
//===---------------------------------------------------------------------===//
#include <math.h>
int t1(double d) { return signbit(d); }
This currently compiles to:
subl $12, %esp
movsd 16(%esp), %xmm0
movsd %xmm0, (%esp)
movl 4(%esp), %eax
shrl $31, %eax
addl $12, %esp
ret
We should use movmskp{s|d} instead.