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Try both ways to fold an add together. This allows us to generate this code

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imul %EAX, %EAX, 400
        add %ECX, %EAX
        add %ESI, DWORD PTR [%ECX + 4*%EDX]
        inc %EDX
        cmp %EDX, 100

instead of this:

        imul %EAX, %EAX, 400
        add %ECX, %EAX
        mov %EAX, %EDX
        shl %EAX, 2
        add %ECX, %EAX
        add %ESI, DWORD PTR [%ECX]
        inc %EDX
        cmp %EDX, 100


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19513 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-01-12 18:08:53 +00:00
parent 3bfbf4ea99
commit 9bbd992eb1
1 changed files with 4 additions and 0 deletions
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4
lib/Target/X86/X86ISelPattern.cpp
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@ -527,6 +527,10 @@ bool ISel::SelectAddress(SDOperand N, X86AddressMode &AM) {
!SelectAddress(N.Val->getOperand(1), AM))
return false;
AM = Backup;
if (!SelectAddress(N.Val->getOperand(1), AM) &&
!SelectAddress(N.Val->getOperand(0), AM))
return false;
AM = Backup;
break;
}
}