derek.holloway
7502bf64a4
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54 lines
1.9 KiB
LLVM
54 lines
1.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes='loop-mssa(loop-instsimplify,loop-simplifycfg,simple-loop-unswitch)' -S %s | FileCheck %s
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; Test case from PR54023. After SimpleLoopUnswitch, one of the loops processed
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; by LoopSimplifyCFG will have exit blocks with predecessors outside the loop
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; (i.e. it is not in loop-simplify/canonical form).
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define i32 @test(i32 %v, i1 %c.1, i1 %c.2) {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[OUTER_HEADER:%.*]]
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; CHECK: outer.header:
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; CHECK-NEXT: br i1 [[C_1:%.*]], label [[OUTER_LATCH:%.*]], label [[INNER_HEADER_PREHEADER:%.*]]
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; CHECK: inner.header.preheader:
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; CHECK-NEXT: br label [[INNER_HEADER:%.*]]
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; CHECK: inner.header:
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; CHECK-NEXT: [[CMP_2:%.*]] = icmp ne i32 [[V:%.*]], 0
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; CHECK-NEXT: br i1 [[CMP_2]], label [[EXIT:%.*]], label [[INNER_LATCH:%.*]]
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; CHECK: inner.latch:
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; CHECK-NEXT: br i1 [[C_2:%.*]], label [[OUTER_LATCH_LOOPEXIT:%.*]], label [[INNER_HEADER]]
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; CHECK: outer.latch.loopexit:
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; CHECK-NEXT: br label [[OUTER_LATCH]]
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; CHECK: outer.latch:
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; CHECK-NEXT: br label [[OUTER_HEADER]]
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; CHECK: exit:
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; CHECK-NEXT: [[RES:%.*]] = phi i32 [ [[V]], [[INNER_HEADER]] ]
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; CHECK-NEXT: br label [[EXIT_SPLIT:%.*]]
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; CHECK: exit.split:
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; CHECK-NEXT: [[RES_SPLIT:%.*]] = phi i32 [ [[RES]], [[EXIT]] ]
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; CHECK-NEXT: ret i32 [[RES_SPLIT]]
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;
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entry:
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br label %outer.header
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outer.header:
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%g.0 = phi i32 [ 10, %outer.latch ], [ 1, %entry ]
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%cmp.1 = icmp eq i32 %g.0, 0
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br i1 %c.1, label %outer.latch, label %inner.header
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inner.header:
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%cmp.2 = icmp ne i32 %v, 0
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%or.cond = or i1 %cmp.1, %cmp.2
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br i1 %or.cond, label %exit, label %inner.latch
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inner.latch:
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br i1 %c.2, label %outer.latch, label %inner.header
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outer.latch:
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br label %outer.header
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exit:
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%res = phi i32 [ %v, %inner.header ]
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ret i32 %res
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}
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