| commit | 7a0678cae6c549a1e11ac0767e04c273c298c0b7 | [log] [tgz] |
|---|---|---|
| author | Christopher Lamb <christopher.lamb@gmail.com> | Tue Dec 18 21:32:20 2007 +0000 |
| committer | Christopher Lamb <christopher.lamb@gmail.com> | Tue Dec 18 21:32:20 2007 +0000 |
| tree | ab9fedb8e4176350b31a3713954215b415645cf1 | |
| parent | feb8893d1757cc4f9400a5969df7f926606e246e [diff] |
Fold subtracts into integer compares vs. zero. This improves generate code for this case on X86
from
_foo:
movl $99, %ecx
movl 4(%esp), %eax
subl %eax, %ecx
xorl %edx, %edx
testl %ecx, %ecx
cmovs %edx, %eax
ret
to
_foo:
xorl %ecx, %ecx
movl 4(%esp), %eax
cmpl $99, %eax
cmovg %ecx, %eax
ret
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45173 91177308-0d34-0410-b5e6-96231b3b80d8