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Rename isLoopGuardedByCond to isLoopEntryGuardedByCond, to emphasise

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that it's only testing for the entry condition, not full loop-invariant
conditions.

llvm-svn: 100979
This commit is contained in:
Dan Gohman 2010-04-11 19:27:13 +00:00
parent adc8df5270
commit 9ca5efece4
4 changed files with 21 additions and 21 deletions
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8
include/llvm/Analysis/ScalarEvolution.h
View File

@ -554,11 +554,11 @@ namespace llvm {
/// getSCEVAtScope(getSCEV(V), L).
const SCEV *getSCEVAtScope(Value *V, const Loop *L);
/// isLoopGuardedByCond - Test whether entry to the loop is protected by
/// a conditional between LHS and RHS. This is used to help avoid max
/// isLoopEntryGuardedByCond - Test whether entry to the loop is protected
/// by a conditional between LHS and RHS. This is used to help avoid max
/// expressions in loop trip counts, and to eliminate casts.
bool isLoopGuardedByCond(const Loop *L, ICmpInst::Predicate Pred,
const SCEV *LHS, const SCEV *RHS);
bool isLoopEntryGuardedByCond(const Loop *L, ICmpInst::Predicate Pred,
const SCEV *LHS, const SCEV *RHS);
/// isLoopBackedgeGuardedByCond - Test whether the backedge of the loop is
/// protected by a conditional between LHS and RHS. This is used to

8
lib/Analysis/PointerTracking.cpp
View File

@ -183,17 +183,17 @@ enum SolverResult PointerTracking::isLoopGuardedBy(const Loop *L,
Predicate Pred,
const SCEV *A,
const SCEV *B) const {
if (SE->isLoopGuardedByCond(L, Pred, A, B))
if (SE->isLoopEntryGuardedByCond(L, Pred, A, B))
return AlwaysTrue;
Pred = ICmpInst::getSwappedPredicate(Pred);
if (SE->isLoopGuardedByCond(L, Pred, B, A))
if (SE->isLoopEntryGuardedByCond(L, Pred, B, A))
return AlwaysTrue;
Pred = ICmpInst::getInversePredicate(Pred);
if (SE->isLoopGuardedByCond(L, Pred, B, A))
if (SE->isLoopEntryGuardedByCond(L, Pred, B, A))
return AlwaysFalse;
Pred = ICmpInst::getSwappedPredicate(Pred);
if (SE->isLoopGuardedByCond(L, Pred, A, B))
if (SE->isLoopEntryGuardedByCond(L, Pred, A, B))
return AlwaysTrue;
return Unknown;
}

24
lib/Analysis/ScalarEvolution.cpp
View File

@ -955,7 +955,7 @@ const SCEV *ScalarEvolution::getZeroExtendExpr(const SCEV *Op,
const SCEV *N = getConstant(APInt::getMinValue(BitWidth) -
getUnsignedRange(Step).getUnsignedMax());
if (isLoopBackedgeGuardedByCond(L, ICmpInst::ICMP_ULT, AR, N) ||
(isLoopGuardedByCond(L, ICmpInst::ICMP_ULT, Start, N) &&
(isLoopEntryGuardedByCond(L, ICmpInst::ICMP_ULT, Start, N) &&
isLoopBackedgeGuardedByCond(L, ICmpInst::ICMP_ULT,
AR->getPostIncExpr(*this), N)))
// Return the expression with the addrec on the outside.
@ -966,7 +966,7 @@ const SCEV *ScalarEvolution::getZeroExtendExpr(const SCEV *Op,
const SCEV *N = getConstant(APInt::getMaxValue(BitWidth) -
getSignedRange(Step).getSignedMin());
if (isLoopBackedgeGuardedByCond(L, ICmpInst::ICMP_UGT, AR, N) &&
(isLoopGuardedByCond(L, ICmpInst::ICMP_UGT, Start, N) ||
(isLoopEntryGuardedByCond(L, ICmpInst::ICMP_UGT, Start, N) ||
isLoopBackedgeGuardedByCond(L, ICmpInst::ICMP_UGT,
AR->getPostIncExpr(*this), N)))
// Return the expression with the addrec on the outside.
@ -1090,7 +1090,7 @@ const SCEV *ScalarEvolution::getSignExtendExpr(const SCEV *Op,
const SCEV *N = getConstant(APInt::getSignedMinValue(BitWidth) -
getSignedRange(Step).getSignedMax());
if (isLoopBackedgeGuardedByCond(L, ICmpInst::ICMP_SLT, AR, N) ||
(isLoopGuardedByCond(L, ICmpInst::ICMP_SLT, Start, N) &&
(isLoopEntryGuardedByCond(L, ICmpInst::ICMP_SLT, Start, N) &&
isLoopBackedgeGuardedByCond(L, ICmpInst::ICMP_SLT,
AR->getPostIncExpr(*this), N)))
// Return the expression with the addrec on the outside.
@ -1101,7 +1101,7 @@ const SCEV *ScalarEvolution::getSignExtendExpr(const SCEV *Op,
const SCEV *N = getConstant(APInt::getSignedMaxValue(BitWidth) -
getSignedRange(Step).getSignedMin());
if (isLoopBackedgeGuardedByCond(L, ICmpInst::ICMP_SGT, AR, N) ||
(isLoopGuardedByCond(L, ICmpInst::ICMP_SGT, Start, N) &&
(isLoopEntryGuardedByCond(L, ICmpInst::ICMP_SGT, Start, N) &&
isLoopBackedgeGuardedByCond(L, ICmpInst::ICMP_SGT,
AR->getPostIncExpr(*this), N)))
// Return the expression with the addrec on the outside.
@ -4751,13 +4751,13 @@ ScalarEvolution::isLoopBackedgeGuardedByCond(const Loop *L,
LoopContinuePredicate->getSuccessor(0) != L->getHeader());
}
/// isLoopGuardedByCond - Test whether entry to the loop is protected
/// isLoopEntryGuardedByCond - Test whether entry to the loop is protected
/// by a conditional between LHS and RHS. This is used to help avoid max
/// expressions in loop trip counts, and to eliminate casts.
bool
ScalarEvolution::isLoopGuardedByCond(const Loop *L,
ICmpInst::Predicate Pred,
const SCEV *LHS, const SCEV *RHS) {
ScalarEvolution::isLoopEntryGuardedByCond(const Loop *L,
ICmpInst::Predicate Pred,
const SCEV *LHS, const SCEV *RHS) {
// Interpret a null as meaning no loop, where there is obviously no guard
// (interprocedural conditions notwithstanding).
if (!L) return false;
@ -5154,10 +5154,10 @@ ScalarEvolution::HowManyLessThans(const SCEV *LHS, const SCEV *RHS,
// only know that it will execute (max(m,n)-n)/s times. In both cases,
// the division must round up.
const SCEV *End = RHS;
if (!isLoopGuardedByCond(L,
isSigned ? ICmpInst::ICMP_SLT :
ICmpInst::ICMP_ULT,
getMinusSCEV(Start, Step), RHS))
if (!isLoopEntryGuardedByCond(L,
isSigned ? ICmpInst::ICMP_SLT :
ICmpInst::ICMP_ULT,
getMinusSCEV(Start, Step), RHS))
End = isSigned ? getSMaxExpr(RHS, Start)
: getUMaxExpr(RHS, Start);

2
lib/Transforms/Scalar/IndVarSimplify.cpp
View File

@ -147,7 +147,7 @@ ICmpInst *IndVarSimplify::LinearFunctionTestReplace(Loop *L,
SE->getAddExpr(BackedgeTakenCount,
SE->getIntegerSCEV(1, BackedgeTakenCount->getType()));
if ((isa<SCEVConstant>(N) && !N->isZero()) ||
SE->isLoopGuardedByCond(L, ICmpInst::ICMP_NE, N, Zero)) {
SE->isLoopEntryGuardedByCond(L, ICmpInst::ICMP_NE, N, Zero)) {
// No overflow. Cast the sum.
RHS = SE->getTruncateOrZeroExtend(N, IndVar->getType());
} else {