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[LoopVectorize] Pointer indicies may be wider than the pointer

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If we are dealing with a pointer induction variable, isInductionPHI
gives back a step value of Stride / size of pointer.  However, we might
be indexing with a legal type wider than the pointer width.
Handle this by inserting casts where appropriate instead of crashing.

This fixes PR23954.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240877 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Majnemer 2015-06-27 08:38:17 +00:00
parent 1166ce2460
commit 8a8d8b3e59
2 changed files with 30 additions and 3 deletions
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13
lib/Transforms/Vectorize/LoopVectorize.cpp
View File

@ -850,6 +850,8 @@ public:
return B.CreateAdd(StartValue, Index);
case IK_PtrInduction:
assert(Index->getType() == StepValue->getType() &&
"Index type does not match StepValue type");
if (StepValue->isMinusOne())
Index = B.CreateNeg(Index);
else if (!StepValue->isOne())
@ -2798,7 +2800,10 @@ void InnerLoopVectorizer::createEmptyLoop() {
break;
}
case LoopVectorizationLegality::IK_PtrInduction: {
EndValue = II.transform(BypassBuilder, CountRoundDown);
Value *CRD = BypassBuilder.CreateSExtOrTrunc(CountRoundDown,
II.StepValue->getType(),
"cast.crd");
EndValue = II.transform(BypassBuilder, CRD);
EndValue->setName("ptr.ind.end");
break;
}
@ -3448,12 +3453,14 @@ void InnerLoopVectorizer::widenPHIInstruction(Instruction *PN,
// This is the normalized GEP that starts counting at zero.
Value *NormalizedIdx =
Builder.CreateSub(Induction, ExtendedIdx, "normalized.idx");
NormalizedIdx =
Builder.CreateSExtOrTrunc(NormalizedIdx, II.StepValue->getType());
// This is the vector of results. Notice that we don't generate
// vector geps because scalar geps result in better code.
for (unsigned part = 0; part < UF; ++part) {
if (VF == 1) {
int EltIndex = part;
Constant *Idx = ConstantInt::get(Induction->getType(), EltIndex);
Constant *Idx = ConstantInt::get(NormalizedIdx->getType(), EltIndex);
Value *GlobalIdx = Builder.CreateAdd(NormalizedIdx, Idx);
Value *SclrGep = II.transform(Builder, GlobalIdx);
SclrGep->setName("next.gep");
@ -3464,7 +3471,7 @@ void InnerLoopVectorizer::widenPHIInstruction(Instruction *PN,
Value *VecVal = UndefValue::get(VectorType::get(P->getType(), VF));
for (unsigned int i = 0; i < VF; ++i) {
int EltIndex = i + part * VF;
Constant *Idx = ConstantInt::get(Induction->getType(), EltIndex);
Constant *Idx = ConstantInt::get(NormalizedIdx->getType(), EltIndex);
Value *GlobalIdx = Builder.CreateAdd(NormalizedIdx, Idx);
Value *SclrGep = II.transform(Builder, GlobalIdx);
SclrGep->setName("next.gep");

20
test/Transforms/LoopVectorize/X86/ptr-indvar-crash.ll Normal file
View File

@ -0,0 +1,20 @@
; RUN: opt -slp-vectorizer -S %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
define void @f(i128 %p1) {
entry:
br label %while.body
while.body:
%p.05 = phi i8* [ %add.ptr, %while.body ], [ null, %entry ]
%p1.addr.04 = phi i128 [ %sub, %while.body ], [ %p1, %entry ]
%add.ptr = getelementptr inbounds i8, i8* %p.05, i32 2
%sub = add nsw i128 %p1.addr.04, -2
%tobool = icmp eq i128 %sub, 0
br i1 %tobool, label %while.end, label %while.body
while.end:
ret void
}