bitcode support change for fast flags compatibility

Summary: The discussion and as per need, each vendor needs a way to keep the old fast flags and the new fast flags in the auto upgrade path of the IR upgrader.  This revision addresses that issue.

Patched by Michael Berg

Reviewers: qcolombet, hans, steven_wu

Reviewed By: qcolombet, steven_wu

Subscribers: dexonsmith, vsk, mehdi_amini, andrewrk, MatzeB, wristow, spatel

Differential Revision: https://reviews.llvm.org/D43253

llvm-svn: 325525

1 files changed, 9 insertions, 7 deletions

diff --git a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
index f38f7df0803..582298136ae 100644
--- a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
+++ b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
@@ -1047,19 +1047,21 @@ static Comdat::SelectionKind getDecodedComdatSelectionKind(unsigned Val) {
 
 static FastMathFlags getDecodedFastMathFlags(unsigned Val) {
   FastMathFlags FMF;
-  if (0 != (Val & FastMathFlags::AllowReassoc))
+  if (0 != (Val & bitc::UnsafeAlgebra))
+    FMF.setFast();
+  if (0 != (Val & bitc::AllowReassoc))
     FMF.setAllowReassoc();
-  if (0 != (Val & FastMathFlags::NoNaNs))
+  if (0 != (Val & bitc::NoNaNs))
     FMF.setNoNaNs();
-  if (0 != (Val & FastMathFlags::NoInfs))
+  if (0 != (Val & bitc::NoInfs))
     FMF.setNoInfs();
-  if (0 != (Val & FastMathFlags::NoSignedZeros))
+  if (0 != (Val & bitc::NoSignedZeros))
     FMF.setNoSignedZeros();
-  if (0 != (Val & FastMathFlags::AllowReciprocal))
+  if (0 != (Val & bitc::AllowReciprocal))
     FMF.setAllowReciprocal();
-  if (0 != (Val & FastMathFlags::AllowContract))
+  if (0 != (Val & bitc::AllowContract))
     FMF.setAllowContract(true);
-  if (0 != (Val & FastMathFlags::ApproxFunc))
+  if (0 != (Val & bitc::ApproxFunc))
     FMF.setApproxFunc();
   return FMF;
 }