Rename isLoopGuardedByCond to isLoopEntryGuardedByCond, to emphasise
that it's only testing for the entry condition, not full loop-invariant
conditions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100979 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp
index 41c8550..c67cb71 100644
--- a/lib/Analysis/ScalarEvolution.cpp
+++ b/lib/Analysis/ScalarEvolution.cpp
@@ -955,7 +955,7 @@
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 *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 *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 *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 @@
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 @@
// 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);