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Add a comment mentioning that InstructionSimplify routines do,

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in fact, resolve undef uses.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173721 91177308-0d34-0410-b5e6-96231b3b80d8
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Dan Gohman 2013-01-28 21:45:32 +00:00
parent ae70224a3e
commit c4e441804e
1 changed files with 6 additions and 0 deletions
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6
include/llvm/Analysis/InstructionSimplify.h
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@ -14,6 +14,12 @@
// ("and i32 %x, %x" -> "%x"). If the simplification is also an instruction
// then it dominates the original instruction.
//
// These routines implicitly resolve undef uses. The easiest way to be safe when
// using these routines to obtain simplified values for existing instructions is
// to always replace all uses of the instructions with the resulting simplified
// values. This will prevent other code from seeing the same undef uses and
// resolving them to different values.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_ANALYSIS_INSTRUCTIONSIMPLIFY_H