derek.holloway
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51 lines
2.2 KiB
LLVM
51 lines
2.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; REQUIRES: asserts
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; RUN: opt -S -enable-loop-simplifycfg-term-folding=true -passes='require<domtree>,loop(loop-simplifycfg)' -debug-only=loop-simplifycfg -verify-loop-info -verify-dom-info -verify-loop-lcssa 2>&1 < %s | FileCheck %s
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; RUN: opt -S -enable-loop-simplifycfg-term-folding=true -passes=loop-simplifycfg -verify-memoryssa -debug-only=loop-simplifycfg -verify-loop-info -verify-dom-info -verify-loop-lcssa 2>&1 < %s | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128-ni:1"
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; This test has irreducible CFG, and RPO may be the following:
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; Header, Dead, Irreducible2, Latch, Irreducible3, Irreducible1.
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; As result, we will process Irreducible2 before its predecessor Irreducible1.
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; The current algorithm gets confused in this case. We may support irreducible
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; CFG in the future.
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define void @irreducible_cfg(i1 %cond) {
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; CHECK-LABEL: @irreducible_cfg(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[HEADER:%.*]]
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; CHECK: header:
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; CHECK-NEXT: br i1 false, label [[DEAD:%.*]], label [[IRREDUCIBLE1:%.*]]
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; CHECK: dead:
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; CHECK-NEXT: br label [[IRREDUCIBLE2:%.*]]
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; CHECK: irreducible2:
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; CHECK-NEXT: br i1 [[COND:%.*]], label [[LATCH:%.*]], label [[IRREDUCIBLE3:%.*]]
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; CHECK: latch:
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; CHECK-NEXT: br label [[HEADER]]
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; CHECK: irreducible3:
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; CHECK-NEXT: br label [[IRREDUCIBLE1]]
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; CHECK: irreducible1:
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; CHECK-NEXT: br label [[IRREDUCIBLE2]]
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;
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entry:
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br label %header
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header: ; preds = %latch, %entry
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br i1 false, label %dead, label %irreducible1
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dead: ; preds = %header
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br label %irreducible2
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irreducible2: ; preds = %irreducible1, %dead
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br i1 %cond, label %latch, label %irreducible3
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latch: ; preds = %irreducible2
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br label %header
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irreducible3: ; preds = %irreducible2
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br label %irreducible1
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irreducible1: ; preds = %irreducible3, %header
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br label %irreducible2
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}
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