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only factor from expressions whose uses are empty and whose

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base is the right expression type.  This fixes PR5981.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93045 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-01-09 06:01:36 +00:00
parent d199636039
commit c2d1b6949c
2 changed files with 24 additions and 1 deletions
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5
lib/Transforms/Scalar/Reassociate.cpp
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@ -792,6 +792,11 @@ Value *Reassociate::OptimizeAdd(Instruction *I,
Instruction *DummyInst = BinaryOperator::CreateAdd(MaxOccVal, MaxOccVal); Instruction *DummyInst = BinaryOperator::CreateAdd(MaxOccVal, MaxOccVal);
SmallVector<Value*, 4> NewMulOps; SmallVector<Value*, 4> NewMulOps;
for (unsigned i = 0, e = Ops.size(); i != e; ++i) { for (unsigned i = 0, e = Ops.size(); i != e; ++i) {
// Only try to remove factors from expressions we're allowed to.
BinaryOperator *BOp = dyn_cast<BinaryOperator>(Ops[i].Op);
if (BOp == 0 || BOp->getOpcode() != Instruction::Mul || !BOp->use_empty())
continue;
if (Value *V = RemoveFactorFromExpression(Ops[i].Op, MaxOccVal)) { if (Value *V = RemoveFactorFromExpression(Ops[i].Op, MaxOccVal)) {
NewMulOps.push_back(V); NewMulOps.push_back(V);
Ops.erase(Ops.begin()+i); Ops.erase(Ops.begin()+i);

20
test/Transforms/Reassociate/crash.ll
View File

@ -2,7 +2,7 @@
; rdar://7507855 ; rdar://7507855
define fastcc i32 @test() nounwind { define fastcc i32 @test1() nounwind {
entry: entry:
%cond = select i1 undef, i32 1, i32 -1 ; <i32> [#uses=2] %cond = select i1 undef, i32 1, i32 -1 ; <i32> [#uses=2]
br label %for.cond br label %for.cond
@ -13,3 +13,21 @@ for.cond: ; preds = %for.body, %entry
%add896 = sub i32 0, %cond ; <i32> [#uses=0] %add896 = sub i32 0, %cond ; <i32> [#uses=0]
ret i32 undef ret i32 undef
} }
; PR5981
define i32 @test2() nounwind ssp {
entry:
%0 = load i32* undef, align 4
%1 = mul nsw i32 undef, %0
%2 = mul nsw i32 undef, %0
%3 = add nsw i32 undef, %1
%4 = add nsw i32 %3, %2
%5 = add nsw i32 %4, 4
%6 = shl i32 %0, 3 ; <i32> [#uses=1]
%7 = add nsw i32 %5, %6
br label %bb4.i9
bb4.i9: ; preds = %bb3.i7, %bb1.i25.i
%8 = add nsw i32 undef, %1
ret i32 0
}