7c3c981442
DFAJumpThreading JumpThreading LibCallsShrink LoopVectorize SLPVectorizer DeadStoreElimination AggressiveDCE CorrelatedValuePropagation IndVarSimplify These are part of the optimization pipeline, of which the legacy version is deprecated and being removed.
44 lines
1.5 KiB
LLVM
44 lines
1.5 KiB
LLVM
; RUN: opt %s -passes=indvars,loop-instsimplify,loop-reduce
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; We are only checking that there is no crash!
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; https://bugs.llvm.org/show_bug.cgi?id=37936
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; The problem is as follows:
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; 1. indvars marks %dec as NUW.
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; 2. loop-instsimplify runs instsimplify, which constant-folds %dec to -1
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; 3. loop-reduce tries to do some further modification, but crashes
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; with an type assertion in cast, because %dec is no longer an Instruction,
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; even though the SCEV data indicated it was.
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; If the runline is split into two, i.e. -indvars -loop-instsimplify first, that
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; stored into a file, and then -loop-reduce is run on that, there is no crash.
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; So it looks like the problem is due to -loop-instsimplify not discarding SCEV.
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target datalayout = "n16"
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@a = external global i16, align 1
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define void @f1() {
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entry:
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br label %for.cond
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for.cond: ; preds = %land.end, %entry
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%c.0 = phi i16 [ 0, %entry ], [ %dec, %land.end ]
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br i1 undef, label %for.body, label %for.cond.cleanup
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for.cond.cleanup: ; preds = %for.cond
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ret void
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for.body: ; preds = %for.cond
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%0 = load i16, ptr @a, align 1
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%cmp = icmp sgt i16 %0, %c.0
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br i1 %cmp, label %land.rhs, label %land.end
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land.rhs: ; preds = %for.body
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unreachable
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land.end: ; preds = %for.body
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%dec = add nsw i16 %c.0, -1
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br label %for.cond
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}
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