[IR] Add AllowContract to FastMathFlags

-ffp-contract=fast does not currently work with LTO because it's passed as a
TargetOption to the backend rather than in the IR. This adds it to
FastMathFlags.

This is toward fixing PR25721

Differential Revision: https://reviews.llvm.org/D31164

llvm-svn: 298939

3 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/AsmParser/LLLexer.cpp b/llvm/lib/AsmParser/LLLexer.cpp
index 752942fc9fc..49a8ce4bed0 100644
--- a/llvm/lib/AsmParser/LLLexer.cpp
+++ b/llvm/lib/AsmParser/LLLexer.cpp
@@ -548,6 +548,7 @@ lltok::Kind LLLexer::LexIdentifier() {
   KEYWORD(ninf);
   KEYWORD(nsz);
   KEYWORD(arcp);
+  KEYWORD(contract);
   KEYWORD(fast);
   KEYWORD(nuw);
   KEYWORD(nsw);
diff --git a/llvm/lib/AsmParser/LLParser.h b/llvm/lib/AsmParser/LLParser.h
index 7dae33480ed..3a794142172 100644
--- a/llvm/lib/AsmParser/LLParser.h
+++ b/llvm/lib/AsmParser/LLParser.h
@@ -193,6 +193,10 @@ namespace llvm {
         case lltok::kw_ninf: FMF.setNoInfs();          Lex.Lex(); continue;
         case lltok::kw_nsz:  FMF.setNoSignedZeros();   Lex.Lex(); continue;
         case lltok::kw_arcp: FMF.setAllowReciprocal(); Lex.Lex(); continue;
+        case lltok::kw_contract:
+          FMF.setAllowContract(true);
+          Lex.Lex();
+          continue;
         default: return FMF;
         }
       return FMF;
diff --git a/llvm/lib/AsmParser/LLToken.h b/llvm/lib/AsmParser/LLToken.h
index 048aeee90b3..33f8e63daa0 100644
--- a/llvm/lib/AsmParser/LLToken.h
+++ b/llvm/lib/AsmParser/LLToken.h
@@ -98,6 +98,7 @@ enum Kind {
   kw_ninf,
   kw_nsz,
   kw_arcp,
+  kw_contract,
   kw_fast,
   kw_nuw,
   kw_nsw,