6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-12-15 04:30:12 +00:00
Code Issues Projects Releases Wiki Activity

Set NSW/NUW flags on SCEVAddExpr when the operation is flagged as

Browse Source 
such.

I'm doing this now for completeness because I can't think of/remember
any reason that it was left out. I'm not sure it will help anything,
but if we don't do it we need to explain why in comments.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139450 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2011-09-10 01:09:50 +00:00
parent 2e3734e2d9
commit 543376743c
1 changed files with 7 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
lib/Analysis/ScalarEvolution.cpp
View File

@ -3546,7 +3546,13 @@ const SCEV *ScalarEvolution::createSCEV(Value *V) {
AddOps.push_back(Op1); AddOps.push_back(Op1);
} }
AddOps.push_back(getSCEV(U->getOperand(0))); AddOps.push_back(getSCEV(U->getOperand(0)));
return getAddExpr(AddOps); SCEV::NoWrapFlags Flags = SCEV::FlagAnyWrap;
OverflowingBinaryOperator *OBO = cast<OverflowingBinaryOperator>(V);
if (OBO->hasNoSignedWrap())
setFlags(Flags, SCEV::FlagNSW);
if (OBO->hasNoUnsignedWrap())
setFlags(Flags, SCEV::FlagNUW);
return getAddExpr(AddOps, Flags);
} }
case Instruction::Mul: { case Instruction::Mul: {
// See the Add code above. // See the Add code above.