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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35884 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-04-11 05:34:00 +00:00
parent 20a35c3fa5
commit b062000c23
1 changed files with 0 additions and 28 deletions
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28
lib/Target/X86/README.txt
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@ -1049,31 +1049,3 @@ int decode_byte (const decode_t* decode) {
//===---------------------------------------------------------------------===//
Consider:
int isnegative(unsigned int X) {
return !(X < 2147483648U);
}
We current compile this to:
define i32 @isnegative(i32 %X) {
icmp slt i32 %X, 0 ; <i1>:0 [#uses=1]
%retval = zext i1 %0 to i32 ; <i32> [#uses=1]
ret i32 %retval
}
and:
_isnegative:
cmpl $0, 4(%esp)
sets %al
movzbl %al, %eax
ret
We should produce:
movl 4(%esp), %eax
shrl $31, %eax
ret