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Add a comment mentioning that InstructionSimplify routines do,

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in fact, resolve undef uses.

llvm-svn: 173721
This commit is contained in:
Dan Gohman 2013-01-28 21:45:32 +00:00
parent a3d3900178
commit 4dd335efb1
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 // ("and i32 %x, %x" -> "%x"). If the simplification is also an instruction
// then it dominates the original 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 #ifndef LLVM_ANALYSIS_INSTRUCTIONSIMPLIFY_H