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Another missed optimization.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42546 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2007-10-02 20:42:59 +00:00
parent c720279ac7
commit 6aab4910cd
1 changed files with 28 additions and 0 deletions
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28
lib/Target/X86/README.txt
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@ -1239,3 +1239,31 @@ _test:
//===---------------------------------------------------------------------===//
The following code:
LBB3_5: # bb114.preheader
movswl -68(%ebp), %eax
movl $32, %ecx
movl %ecx, -80(%ebp)
subl %eax, -80(%ebp)
movswl -52(%ebp), %eax
movl %ecx, -84(%ebp)
subl %eax, -84(%ebp)
movswl -70(%ebp), %eax
movl %ecx, -88(%ebp)
subl %eax, -88(%ebp)
movswl -50(%ebp), %eax
subl %eax, %ecx
movl %ecx, -76(%ebp)
movswl -42(%ebp), %eax
movl %eax, -92(%ebp)
movswl -66(%ebp), %eax
movl %eax, -96(%ebp)
movw $0, -98(%ebp)
has redundant subtractions of %eax from a stack slot. However, %ecx doesn't
change, so we could simply subtract %eax from %ecx first and then use %ecx (or
vice-versa).
//===---------------------------------------------------------------------===//