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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85331 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2009-10-27 22:40:45 +00:00
parent 18fec73e29
commit d8499c9b7f
1 changed files with 8 additions and 0 deletions
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8
lib/Target/X86/README.txt
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@ -1969,9 +1969,17 @@ LBB1_2:
movsbl %al, %eax movsbl %al, %eax
Better: Better:
movl %esi, %eax movl %esi, %eax
orl $-128, %eax orl $-128, %eax
andl $-128, %esi andl $-128, %esi
testb %dil, %dil testb %dil, %dil
cmovns %esi, %eax cmovns %esi, %eax
movsbl %al,%eax movsbl %al,%eax
Best (recognize this as 'b = (b & ~0x80) | (a & 0x80)'):
andb $-128, %dil
andb $127, %sil
orb %dil, %sil
movsbl %sil, %eax