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Add support for fast-math flags to the FCmp instruction.

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FCmp behaves a lot like a floating-point binary operator in many ways,
and can benefit from fast-math information. Flags such as nsz and nnan
can affect if this fcmp (in combination with a select) can be treated
as a fminnum/fmaxnum operation.

This adds backwards-compatible bitcode support, IR parsing and writing,
LangRef changes and IRBuilder changes. I'll need to audit InstSimplify
and InstCombine in a followup to find places where flags should be
copied.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241901 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
James Molloy
2015-07-10 12:52:00 +00:00
parent e57b60a7f9
commit ee0d992b07
8 changed files with 149 additions and 54 deletions
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6
lib/Bitcode/Writer/BitcodeWriter.cpp
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@@ -1759,13 +1759,17 @@ static void WriteInstruction(const Instruction &I, unsigned InstID,
pushValue(I.getOperand(2), InstID, Vals, VE);
break;
case Instruction::ICmp:
case Instruction::FCmp:
case Instruction::FCmp: {
// compare returning Int1Ty or vector of Int1Ty
Code = bitc::FUNC_CODE_INST_CMP2;
PushValueAndType(I.getOperand(0), InstID, Vals, VE);
pushValue(I.getOperand(1), InstID, Vals, VE);
Vals.push_back(cast<CmpInst>(I).getPredicate());
uint64_t Flags = GetOptimizationFlags(&I);
if (Flags != 0)
Vals.push_back(Flags);
break;
}
case Instruction::Ret:
{