64 lines
2.3 KiB
LLVM
64 lines
2.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; We run -indvars before -simple-loop-unswitch to compute SCEV exit counts before
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; running -simple-loop-unswitch.
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; RUN: opt -indvars -simple-loop-unswitch -S %s -verify-scev | FileCheck %s
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; Test for PR43972.
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; We have a 3 nested loops (l1 <- l2 <- l3). %for.cond.5 is the exit block of
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; l3 and the loop for it is l2. But it is also the exiting block of l1. That
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; means we have to invalidate l1 to preserve SCEV.
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define void @f() {
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; CHECK-LABEL: @f(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[LNOT:%.*]] = xor i1 undef, true
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; CHECK-NEXT: br label [[FOR_COND:%.*]]
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; CHECK: for.cond.loopexit:
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; CHECK-NEXT: br label [[FOR_COND]]
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; CHECK: for.cond:
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; CHECK-NEXT: br label [[FOR_BODY:%.*]]
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; CHECK: for.cond1:
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; CHECK-NEXT: br i1 true, label [[FOR_BODY]], label [[FOR_COND_LOOPEXIT:%.*]]
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; CHECK: for.body:
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; CHECK-NEXT: br i1 [[LNOT]], label [[FOR_BODY_SPLIT:%.*]], label [[FOR_COND5_SPLIT:%.*]]
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; CHECK: for.body.split:
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; CHECK-NEXT: br label [[LAND_RHS:%.*]]
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; CHECK: for.cond2:
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; CHECK-NEXT: br i1 true, label [[LAND_RHS]], label [[FOR_COND5:%.*]]
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; CHECK: land.rhs:
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; CHECK-NEXT: br label [[FOR_COND2:%.*]]
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; CHECK: for.cond5:
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; CHECK-NEXT: br label [[FOR_COND5_SPLIT]]
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; CHECK: for.cond5.split:
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; CHECK-NEXT: br i1 true, label [[FOR_BODY7:%.*]], label [[FOR_COND1:%.*]]
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; CHECK: for.body7:
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; CHECK-NEXT: ret void
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;
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entry:
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%lnot = xor i1 undef, true
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br label %for.cond
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for.cond: ; preds = %for.cond1, %entry
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br label %for.body
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for.cond1: ; preds = %for.cond5
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br i1 true, label %for.body, label %for.cond
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for.body: ; preds = %for.cond1, %for.cond
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br label %land.rhs
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for.cond2: ; preds = %land.rhs
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br i1 true, label %land.rhs, label %for.cond5
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land.rhs: ; preds = %for.cond2, %for.body
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br i1 %lnot, label %for.cond2, label %for.cond5
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for.cond5: ; preds = %land.rhs, %for.cond2
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br i1 true, label %for.body7, label %for.cond1
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for.body7: ; preds = %for.cond5
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ret void
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}
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