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move PR9803 to this readme.

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llvm-svn: 130385
This commit is contained in:
Chris Lattner 2011-04-28 05:33:16 +00:00
parent 2cd5c3603f
commit 61521f8481
1 changed files with 28 additions and 0 deletions
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28
lib/Target/X86/README.txt
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@ -2032,3 +2032,31 @@ clamp_float: # @clamp_float
with -ffast-math.
//===---------------------------------------------------------------------===//
This function (from PR9803):
int clamp2(int a) {
if (a > 5)
a = 5;
if (a < 0)
return 0;
return a;
}
Compiles to:
_clamp2: ## @clamp2
pushq %rbp
movq %rsp, %rbp
cmpl $5, %edi
movl $5, %ecx
cmovlel %edi, %ecx
testl %ecx, %ecx
movl $0, %eax
cmovnsl %ecx, %eax
popq %rbp
ret
The move of 0 could be scheduled above the test to make it is xor reg,reg.
//===---------------------------------------------------------------------===//