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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47688 91177308-0d34-0410-b5e6-96231b3b80d8
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Evan Cheng 2008-02-27 20:26:32 +00:00
parent 21b3f31f8f
commit fd1074f171
1 changed files with 0 additions and 24 deletions
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24
lib/Target/X86/README.txt
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@ -1553,30 +1553,6 @@ abs:
//===---------------------------------------------------------------------===//
Consider:
#include <inttypes.h>
uint64_t a;
uint16_t b;
uint64_t mul(void) {
return a * b;
}
Currently, we generate the following:
mul:
movzwl b, %ecx
movl %ecx, %eax
mull a
imull a+4, %ecx
addl %edx, %ecx
movl %ecx, %edx
ret
llvm should be able to commute the addl so that the movl isn't necessary.
//===---------------------------------------------------------------------===//
Consider:
int test(unsigned long a, unsigned long b) { return -(a < b); }