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[FPEnv] Add some comments to IRBuilder.h 

As requested via post-commit comment for D71467, this adds comments
documenting CreateFCmp vs. CreateFCmpS to the header file.
This commit is contained in:
Ulrich Weigand 2020-01-14 14:19:02 +01:00
parent dee6e39c75
commit 6aca3e8dfa
1 changed files with 6 additions and 0 deletions
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6
llvm/include/llvm/IR/IRBuilder.h
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@ -2361,6 +2361,9 @@ public:
return Insert(new ICmpInst(P, LHS, RHS), Name);
}
// Create a quiet floating-point comparison (i.e. one that raises an FP
// exception only in the case where an input is a signaling NaN).
// Note that this differs from CreateFCmpS only if IsFPConstrained is true.
Value *CreateFCmp(CmpInst::Predicate P, Value *LHS, Value *RHS,
const Twine &Name = "", MDNode *FPMathTag = nullptr) {
if (IsFPConstrained)
@ -2373,6 +2376,9 @@ public:
return Insert(setFPAttrs(new FCmpInst(P, LHS, RHS), FPMathTag, FMF), Name);
}
// Create a signaling floating-point comparison (i.e. one that raises an FP
// exception whenever an input is any NaN, signaling or quiet).
// Note that this differs from CreateFCmp only if IsFPConstrained is true.
Value *CreateFCmpS(CmpInst::Predicate P, Value *LHS, Value *RHS,
const Twine &Name = "", MDNode *FPMathTag = nullptr) {
if (IsFPConstrained)