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ScalarEvolution: Warn if the result of setFlags/clearFlags is unused. 

This was a source of bugs in the past.

llvm-svn: 194929
This commit is contained in:
Benjamin Kramer 2013-11-16 16:25:47 +00:00
parent 5f2768c377
commit c6f955763e
1 changed files with 6 additions and 5 deletions
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11
llvm/include/llvm/Analysis/ScalarEvolution.h
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@ -189,15 +189,16 @@ namespace llvm {
/// Convenient NoWrapFlags manipulation that hides enum casts and is
/// visible in the ScalarEvolution name space.
static SCEV::NoWrapFlags maskFlags(SCEV::NoWrapFlags Flags, int Mask) {
static SCEV::NoWrapFlags LLVM_ATTRIBUTE_UNUSED_RESULT
maskFlags(SCEV::NoWrapFlags Flags, int Mask) {
return (SCEV::NoWrapFlags)(Flags & Mask);
}
static SCEV::NoWrapFlags setFlags(SCEV::NoWrapFlags Flags,
SCEV::NoWrapFlags OnFlags) {
static SCEV::NoWrapFlags LLVM_ATTRIBUTE_UNUSED_RESULT
setFlags(SCEV::NoWrapFlags Flags, SCEV::NoWrapFlags OnFlags) {
return (SCEV::NoWrapFlags)(Flags | OnFlags);
}
static SCEV::NoWrapFlags clearFlags(SCEV::NoWrapFlags Flags,
SCEV::NoWrapFlags OffFlags) {
static SCEV::NoWrapFlags LLVM_ATTRIBUTE_UNUSED_RESULT
clearFlags(SCEV::NoWrapFlags Flags, SCEV::NoWrapFlags OffFlags) {
return (SCEV::NoWrapFlags)(Flags & ~OffFlags);
}