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cac07a241c
Peeling assumed this doesn't happen, but didn't check it. This fixes PR32178. Differential Revision: https://reviews.llvm.org/D30757 llvm-svn: 297993
37 lines
951 B
LLVM
37 lines
951 B
LLVM
; RUN: opt < %s -S -loop-unroll -unroll-force-peel-count=1 | FileCheck %s
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; Check we don't peel loops where the latch is not the exiting block.
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; CHECK-LABEL: @invariant_backedge_irreducible
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; CHECK: entry:
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; CHECK: br label %header
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; CHECK-NOT: peel
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; CHECK: header:
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; CHECK: br i1 {{.*}} label %latch, label %exiting
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; CHECK: latch:
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; CHECK: br i1 {{.*}} label %header, label %exiting
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; CHECK: exiting:
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; CHECK: br i1 {{.*}} label %latch, label %exit
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define i32 @invariant_backedge_irreducible(i32 %a, i32 %b) {
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entry:
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br label %header
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header:
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%i = phi i32 [ 0, %entry ], [ %inc, %latch ]
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%cmp.phi = phi i1 [ false, %entry ], [ %cmp, %latch ]
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br i1 %cmp.phi, label %latch, label %exiting
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latch:
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%inc = add i32 %i, 1
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%cmp = icmp slt i32 %i, 1000
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br i1 %cmp, label %header, label %exiting
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exiting:
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%cmp.exiting = phi i1 [ %cmp.phi, %header ], [ %cmp, %latch ]
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br i1 %cmp.exiting, label %latch, label %exit
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exit:
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ret i32 0
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}
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