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It turns out that with the current scev organization ReuseOrCreateCast cannot

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know where users will be added. Because of this, it cannot use
Builder.GetInsertPoint at all.

This patch
* removes the FIXME about adding the assert.
* adds a comment explaining hy we don't have one.
* removes a broken logic that only works for some callers and is not needed
  since r150884.
* adds an assert to caller that would have caught the bug fixed by r150884.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151015 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2012-02-21 01:19:51 +00:00
parent fd6d3217d3
commit 4b04578d65
1 changed files with 9 additions and 9 deletions
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18
lib/Analysis/ScalarEvolutionExpander.cpp
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@ -31,13 +31,11 @@ using namespace llvm;
Value *SCEVExpander::ReuseOrCreateCast(Value *V, Type *Ty,
Instruction::CastOps Op,
BasicBlock::iterator IP) {
// All new or reused instructions must strictly dominate the Builder's
// InsertPt to ensure that the expression's expansion dominates its uses.
// Assert that the requested insertion point works at least for new
// instructions.
// FIXME: disabled to make the bots happy.
//assert(SE.DT->dominates(IP, Builder.GetInsertPoint()));
// All new or reused instructions must strictly dominate their uses.
// It would be nice to assert this here, but we don't always know where
// the next instructions will be added as the the caller can move the
// Builder's InsertPt before creating them and we might be called with
// an invalid InsertPt.
// Check to see if there is already a cast!
for (Value::use_iterator UI = V->use_begin(), E = V->use_end();
@ -47,8 +45,7 @@ Value *SCEVExpander::ReuseOrCreateCast(Value *V, Type *Ty,
if (CastInst *CI = dyn_cast<CastInst>(U))
if (CI->getOpcode() == Op) {
// If the cast isn't where we want it, fix it.
if (BasicBlock::iterator(CI) != IP
|| IP == Builder.GetInsertPoint()) {
if (BasicBlock::iterator(CI) != IP) {
// Create a new cast, and leave the old cast in place in case
// it is being used as an insert point. Clear its operand
// so that it doesn't hold anything live.
@ -506,6 +503,9 @@ Value *SCEVExpander::expandAddToGEP(const SCEV *const *op_begin,
V = InsertNoopCastOfTo(V,
Type::getInt8PtrTy(Ty->getContext(), PTy->getAddressSpace()));
Instruction *Inst = dyn_cast<Instruction>(V);
assert(!Inst || SE.DT->properlyDominates(Inst, Builder.GetInsertPoint()));
// Expand the operands for a plain byte offset.
Value *Idx = expandCodeFor(SE.getAddExpr(Ops), Ty);