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Note corrected.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85332 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2009-10-27 22:43:24 +00:00
parent d8499c9b7f
commit de020736c0
1 changed files with 5 additions and 3 deletions
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8
lib/Target/X86/README.txt
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@ -1955,12 +1955,13 @@ information to add the "lock" prefix.
//===---------------------------------------------------------------------===//
int func(int a, int b) { if (a & 0x80) b |= 0x80; else b &= 0x80; return b; }
int func(int a, int b) { if (a & 0x80) b |= 0x80; else b &= ~0x80; return b; }
Current:
movb %sil, %al
andb $-128, %sil
andb $127, %sil
orb $-128, %al
testb %dil, %dil
js LBB1_2
@ -1968,11 +1969,12 @@ Current:
LBB1_2:
movsbl %al, %eax
Better:
movl %esi, %eax
orl $-128, %eax
andl $-128, %esi
andl $127, %esi
testb %dil, %dil
cmovns %esi, %eax
movsbl %al,%eax