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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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22
lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@ -253,7 +253,8 @@ static void DoInitialMatch(const SCEV *S, Loop *L,
DoInitialMatch(AR->getStart(), L, Good, Bad, SE);
DoInitialMatch(SE.getAddRecExpr(SE.getConstant(AR->getType(), 0),
AR->getStepRecurrence(SE),
AR->getLoop()),
// FIXME: AR->getNoWrapFlags()
AR->getLoop(), SCEV::FlagAnyWrap),
L, Good, Bad, SE);
return;
}
@ -455,7 +456,10 @@ static const SCEV *getExactSDiv(const SCEV *LHS, const SCEV *RHS,
const SCEV *Start = getExactSDiv(AR->getStart(), RHS, SE,
IgnoreSignificantBits);
if (!Start) return 0;
return SE.getAddRecExpr(Start, Step, AR->getLoop());
// FlagNW is independent of the start value, step direction, and is
// preserved with smaller magnitude steps.
// FIXME: AR->getNoWrapFlags(SCEV::FlagNW)
return SE.getAddRecExpr(Start, Step, AR->getLoop(), SCEV::FlagAnyWrap);
}
return 0;
}
@ -520,7 +524,9 @@ static int64_t ExtractImmediate(const SCEV *&S, ScalarEvolution &SE) {
SmallVector<const SCEV *, 8> NewOps(AR->op_begin(), AR->op_end());
int64_t Result = ExtractImmediate(NewOps.front(), SE);
if (Result != 0)
S = SE.getAddRecExpr(NewOps, AR->getLoop());
S = SE.getAddRecExpr(NewOps, AR->getLoop(),
// FIXME: AR->getNoWrapFlags(SCEV::FlagNW)
SCEV::FlagAnyWrap);
return Result;
}
return 0;
@ -545,7 +551,9 @@ static GlobalValue *ExtractSymbol(const SCEV *&S, ScalarEvolution &SE) {
SmallVector<const SCEV *, 8> NewOps(AR->op_begin(), AR->op_end());
GlobalValue *Result = ExtractSymbol(NewOps.front(), SE);
if (Result)
S = SE.getAddRecExpr(NewOps, AR->getLoop());
S = SE.getAddRecExpr(NewOps, AR->getLoop(),
// FIXME: AR->getNoWrapFlags(SCEV::FlagNW)
SCEV::FlagAnyWrap);
return Result;
}
return 0;
@ -2236,7 +2244,9 @@ static void CollectSubexprs(const SCEV *S, const SCEVConstant *C,
if (!AR->getStart()->isZero()) {
CollectSubexprs(SE.getAddRecExpr(SE.getConstant(AR->getType(), 0),
AR->getStepRecurrence(SE),
AR->getLoop()),
AR->getLoop(),
//FIXME: AR->getNoWrapFlags(SCEV::FlagNW)
SCEV::FlagAnyWrap),
C, Ops, L, SE);
CollectSubexprs(AR->getStart(), C, Ops, L, SE);
return;
@ -3047,7 +3057,7 @@ void LSRInstance::NarrowSearchSpaceByCollapsingUnrolledCode() {
}
}
/// NarrowSearchSpaceByRefilteringUndesirableDedicatedRegisters - Call
/// NarrowSearchSpaceByRefilteringUndesirableDedicatedRegisters - Call
/// FilterOutUndesirableDedicatedRegisters again, if necessary, now that
/// we've done more filtering, as it may be able to find more formulae to
/// eliminate.