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0afc9b33fe
I could not come up with a test case for this one; but I don't think `getPreStartForSignExtend` can assume `AR` is `nsw` -- there is one place in scalar evolution that calls `getSignExtendAddRecStart(AR, ...)` without proving that `AR` is `nsw` (line 1564) OperandExtendedAdd = getAddExpr(WideStart, getMulExpr(WideMaxBECount, getZeroExtendExpr(Step, WideTy))); if (SAdd == OperandExtendedAdd) { // If AR wraps around then // // abs(Step) * MaxBECount > unsigned-max(AR->getType()) // => SAdd != OperandExtendedAdd // // Thus (AR is not NW => SAdd != OperandExtendedAdd) <=> // (SAdd == OperandExtendedAdd => AR is NW) const_cast<SCEVAddRecExpr *>(AR)->setNoWrapFlags(SCEV::FlagNW); // Return the expression with the addrec on the outside. return getAddRecExpr(getSignExtendAddRecStart(AR, Ty, this), getZeroExtendExpr(Step, Ty), L, AR->getNoWrapFlags()); } Differential Revision: http://reviews.llvm.org/D7640 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229594 91177308-0d34-0410-b5e6-96231b3b80d8 |
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Analysis | ||
AsmParser | ||
Bitcode | ||
CodeGen | ||
DebugInfo | ||
ExecutionEngine | ||
Fuzzer | ||
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CMakeLists.txt | ||
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