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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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13
lib/AsmParser/LLParser.cpp
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@@ -4534,8 +4534,17 @@ int LLParser::ParseInstruction(Instruction *&Inst, BasicBlock *BB,
case lltok::kw_and:
case lltok::kw_or:
case lltok::kw_xor: return ParseLogical(Inst, PFS, KeywordVal);
case lltok::kw_icmp:
case lltok::kw_fcmp: return ParseCompare(Inst, PFS, KeywordVal);
case lltok::kw_icmp: return ParseCompare(Inst, PFS, KeywordVal);
case lltok::kw_fcmp: {
FastMathFlags FMF = EatFastMathFlagsIfPresent();
int Res = ParseCompare(Inst, PFS, KeywordVal);
if (Res != 0)
return Res;
if (FMF.any())
Inst->setFastMathFlags(FMF);
return 0;
}
// Casts.
case lltok::kw_trunc:
case lltok::kw_zext: