[llvm-commits] [PATCH] optimization of x == -y for X86

[manman ren]

This patch optimizes codegen for if(x==-y) on x86
from
    negl    %esi
    cmpl    %esi, %edi
    je    .LBB0_2
to
    addl    %esi, %edi
    je    .L4

This case is correctly handled for ARM with "cmn".
The patch modified one source file: lib/Target/X86/X86ISelLowering.cpp

Please review & provide feedback.
Thanks,
Manman
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