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Fix a bug Brian found.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12754 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-04-07 16:16:11 +00:00
parent 2d26135b90
commit 627018b4b3
1 changed files with 3 additions and 2 deletions
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5
lib/Analysis/ScalarEvolution.cpp
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@ -924,6 +924,7 @@ SCEVHandle SCEVZeroExtendExpr::get(const SCEVHandle &Op, const Type *Ty) {
// get - Get a canonical add expression, or something simpler if possible.
SCEVHandle SCEVAddExpr::get(std::vector<SCEVHandle> &Ops) {
assert(!Ops.empty() && "Cannot get empty add!");
if (Ops.size() == 1) return Ops[0];
// Sort by complexity, this groups all similar expression types together.
std::sort(Ops.begin(), Ops.end(), SCEVComplexityCompare());
@ -932,6 +933,7 @@ SCEVHandle SCEVAddExpr::get(std::vector<SCEVHandle> &Ops) {
unsigned Idx = 0;
if (SCEVConstant *LHSC = dyn_cast<SCEVConstant>(Ops[0])) {
++Idx;
assert(Idx < Ops.size());
while (SCEVConstant *RHSC = dyn_cast<SCEVConstant>(Ops[Idx])) {
// We found two constants, fold them together!
Constant *Fold = ConstantExpr::getAdd(LHSC->getValue(), RHSC->getValue());
@ -954,8 +956,7 @@ SCEVHandle SCEVAddExpr::get(std::vector<SCEVHandle> &Ops) {
}
}
if (Ops.size() == 1)
return Ops[0];
if (Ops.size() == 1) return Ops[0];
// Okay, check to see if the same value occurs in the operand list twice. If
// so, merge them together into an multiply expression. Since we sorted the