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Added SCEV::NoWrapFlags to manage unsigned, signed, and self wrap

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properties.
Added the self-wrap flag for SCEV::AddRecExpr.
A slew of temporary FIXMEs indicate the intention of the no-self-wrap flag
without changing behavior in this revision.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127590 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
2011-03-14 16:50:06 +00:00
parent d99b39e43b
commit 3228cc259b
7 changed files with 307 additions and 182 deletions
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3
lib/Analysis/ScalarEvolutionNormalization.cpp
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@ -97,7 +97,8 @@ const SCEV *llvm::TransformForPostIncUse(TransformKind Kind,
const SCEV *N = TransformForPostIncUse(Kind, O, LUser, 0, Loops, SE, DT);
Operands.push_back(N);
}
const SCEV *Result = SE.getAddRecExpr(Operands, L);
// Conservatively use AnyWrap until/unless we need FlagNW.
const SCEV *Result = SE.getAddRecExpr(Operands, L, SCEV::FlagAnyWrap);
switch (Kind) {
default: llvm_unreachable("Unexpected transform name!");
case NormalizeAutodetect: