derek.holloway
7502bf64a4
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64 lines
1.7 KiB
LLVM
64 lines
1.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -passes=simplifycfg < %s | FileCheck %s
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; This used to infinitely thread between loop and loop.latch without reaching a
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; fixed point.
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declare void @dummy()
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define i32 @main(i1 %c1, i1 %c2, i32 %y) {
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; CHECK-LABEL: @main(
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; CHECK-NEXT: br i1 [[C1:%.*]], label [[EXIT:%.*]], label [[LOOP_PRE_PREHEADER:%.*]]
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; CHECK: loop.pre.preheader:
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; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i32 [[Y:%.*]], -1
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; CHECK-NEXT: br i1 [[CMP]], label [[LOOP_PREHEADER:%.*]], label [[EXIT]]
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; CHECK: loop.preheader:
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; CHECK-NEXT: [[CMP2:%.*]] = icmp eq i32 [[Y]], 0
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: br i1 [[C1]], label [[LOOP2:%.*]], label [[LOOP_LATCH:%.*]]
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; CHECK: loop.latch:
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; CHECK-NEXT: br i1 [[CMP]], label [[LOOP]], label [[EXIT]]
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; CHECK: loop2:
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; CHECK-NEXT: br i1 [[CMP2]], label [[JOIN:%.*]], label [[IF:%.*]]
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; CHECK: if:
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; CHECK-NEXT: call void @dummy()
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; CHECK-NEXT: br label [[JOIN]]
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; CHECK: join:
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; CHECK-NEXT: br i1 [[C2:%.*]], label [[LOOP2]], label [[LOOP_LATCH]]
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; CHECK: exit:
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; CHECK-NEXT: ret i32 0
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;
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br i1 %c1, label %exit, label %loop.pre.preheader
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loop.pre.preheader:
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%cmp = icmp sgt i32 %y, -1
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br i1 %cmp, label %loop.preheader, label %exit
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loop.preheader:
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%cmp2 = icmp eq i32 %y, 0
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br label %loop
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loop:
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br i1 %c1, label %loop2, label %loop.latch
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loop.latch:
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br i1 %cmp, label %loop, label %exit
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loop2:
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br i1 %cmp2, label %join, label %if
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if:
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call void @dummy()
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br label %join
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join:
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br i1 %c2, label %loop2, label %loop.latch
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exit:
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ret i32 0
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; uselistorder directives
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uselistorder label %loop2, { 1, 0 }
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}
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