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add a simple hack

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45343 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-12-24 19:27:46 +00:00
parent 97d37260df
commit 44cb8efdc1
1 changed files with 12 additions and 0 deletions
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12
lib/Target/X86/README.txt
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@ -1573,3 +1573,15 @@ _test:
//===---------------------------------------------------------------------===//
We can fold a store into "zeroing a reg". Instead of:
xorl %eax, %eax
movl %eax, 124(%esp)
we should get:
movl $0, 124(%esp)
if the flags of the xor are dead.
//===---------------------------------------------------------------------===//