diff options
| -rw-r--r-- | include/llvm/Analysis/InstructionSimplify.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/llvm/Analysis/InstructionSimplify.h b/include/llvm/Analysis/InstructionSimplify.h index b653e799f7..06e4432967 100644 --- a/include/llvm/Analysis/InstructionSimplify.h +++ b/include/llvm/Analysis/InstructionSimplify.h @@ -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 |