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[LoopLoadElim] Add test showing that LoopLoadElim doesn't work correctly with new PM

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This commit is contained in:
Max Kazantsev 2020-04-08 17:22:53 +07:00
parent f88aa39e68
commit 986d90607e
2 changed files with 28 additions and 0 deletions
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1
lib/Transforms/Scalar/LoopLoadElimination.cpp
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@ -432,6 +432,7 @@ public:
Value *Ptr = Cand.Load->getPointerOperand(); Value *Ptr = Cand.Load->getPointerOperand();
auto *PtrSCEV = cast<SCEVAddRecExpr>(PSE.getSCEV(Ptr)); auto *PtrSCEV = cast<SCEVAddRecExpr>(PSE.getSCEV(Ptr));
auto *PH = L->getLoopPreheader(); auto *PH = L->getLoopPreheader();
assert(PH && "Preheader should exist!");
Value *InitialPtr = SEE.expandCodeFor(PtrSCEV->getStart(), Ptr->getType(), Value *InitialPtr = SEE.expandCodeFor(PtrSCEV->getStart(), Ptr->getType(),
PH->getTerminator()); PH->getTerminator());
Value *Initial = new LoadInst( Value *Initial = new LoadInst(

27
test/Transforms/LoopLoadElim/new-pm-preheader-problem.ll Normal file
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@ -0,0 +1,27 @@
; XFAIL: *
; RUN: opt -passes=loop-load-elim -S < %s | FileCheck %s
; This test demonstrates an assertion failure due to missing preheader in new PM.
; REQUIRES: asserts
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
define void @test(i32* noalias nocapture %A, i32* noalias nocapture readonly %B, i64 %N, i1 %C) {
entry:
br i1 %C, label %for.body, label %for.end
; CHECK: test
for.body:
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%arrayidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
%load = load i32, i32* %arrayidx, align 4
%arrayidx2 = getelementptr inbounds i32, i32* %B, i64 %indvars.iv
%load_1 = load i32, i32* %arrayidx2, align 4
%add = add i32 %load_1, %load
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%arrayidx_next = getelementptr inbounds i32, i32* %A, i64 %indvars.iv.next
store i32 %add, i32* %arrayidx_next, align 4
%exitcond = icmp eq i64 %indvars.iv.next, %N
br i1 %exitcond, label %for.end, label %for.body
for.end:
ret void
}