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2142edaac4
Summary: This fixes PR26682. Also add LCSSA as a preserved pass to LoopSimplify, that looks correct to me and allows to write a test for the issue. Reviewers: chandlerc, bogner, sanjoy Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D21112 llvm-svn: 272224
33 lines
852 B
LLVM
33 lines
852 B
LLVM
; RUN: opt < %s -lcssa -loop-simplify -indvars -S | FileCheck %s
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-unknown"
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@a = external global i32, align 4
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; Check that loop-simplify merges two loop exits, but preserves LCSSA form.
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; CHECK-LABEL: @foo
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; CHECK: for:
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; CHECK: %or.cond = and i1 %cmp1, %cmp2
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; CHECK-NOT: for.cond:
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; CHECK: for.end:
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; CHECK: %a.lcssa = phi i32 [ %a, %for ]
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define i32 @foo(i32 %x) {
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entry:
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br label %for
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for:
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%iv = phi i32 [ 0, %entry ], [ %iv.next, %for.cond ]
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%cmp1 = icmp eq i32 %x, 0
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%iv.next = add nuw nsw i32 %iv, 1
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%a = load i32, i32* @a
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br i1 %cmp1, label %for.cond, label %for.end
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for.cond:
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%cmp2 = icmp slt i32 %iv.next, 4
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br i1 %cmp2, label %for, label %for.end
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for.end:
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%a.lcssa = phi i32 [ %a, %for ], [ %a, %for.cond ]
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ret i32 %a.lcssa
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}
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