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(C1-X) == C2 --> X == C1-C2 (X+C1) == C2 --> X == C2-C1 This allows us to compile this: bool %X(int %X) { %Y = add int %X, 14 %Z = setne int %Y, 12345 ret bool %Z } into this: _X: cmpl $12331, 4(%esp) setne %al movzbl %al, %eax andl $1, %eax ret not this: _X: movl $14, %eax addl 4(%esp), %eax cmpl $12345, %eax setne %al movzbl %al, %eax andl $1, %eax ret Testcase here: Regression/CodeGen/X86/compare-add.ll nukage of the and coming up next. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25898 91177308-0d34-0410-b5e6-96231b3b80d8
Low Level Virtual Machine (LLVM) ================================ This directory and its subdirectories contain source code for the Low Level Virtual Machine, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments. LLVM is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt. Please see the HTML documentation provided in docs/index.html for further assistance with LLVM.
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