derek.holloway
7502bf64a4
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47 lines
1.8 KiB
LLVM
47 lines
1.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=gvn -S -verify-loop-info %s | FileCheck %s
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; Make sure we do not try to preserve loop-simplify form, if it would mean
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; splitting blocks with indirectbr predecessors.
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declare i1 @cond()
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define i32 @foo(ptr %p1, ptr %p2, ptr %p3) {
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; CHECK-LABEL: @foo(
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; CHECK-NEXT: bb:
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; CHECK-NEXT: br label [[LOOP_HEADER:%.*]]
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; CHECK: loop.header:
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; CHECK-NEXT: store i32 0, ptr [[P3:%.*]], align 4
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; CHECK-NEXT: indirectbr ptr [[P1:%.*]], [label [[LOOP_LATCH1:%.*]], label %loop.latch2]
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; CHECK: loop.latch1:
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; CHECK-NEXT: [[C:%.*]] = call i1 @cond()
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; CHECK-NEXT: br i1 [[C]], label [[LOOP_HEADER]], label [[LOOP_LATCH1_EXIT_CRIT_EDGE:%.*]]
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; CHECK: loop.latch1.exit_crit_edge:
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; CHECK-NEXT: [[X_PRE:%.*]] = load i32, ptr [[P3]], align 4
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; CHECK-NEXT: br label [[EXIT:%.*]]
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; CHECK: loop.latch2:
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; CHECK-NEXT: indirectbr ptr [[P2:%.*]], [label [[LOOP_HEADER]], label %exit]
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; CHECK: exit:
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; CHECK-NEXT: [[X:%.*]] = phi i32 [ [[X_PRE]], [[LOOP_LATCH1_EXIT_CRIT_EDGE]] ], [ 0, [[LOOP_LATCH2:%.*]] ]
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; CHECK-NEXT: ret i32 [[X]]
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;
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bb:
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br label %loop.header
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loop.header: ; preds = %loop.latch2, %loop.latch1, %bb
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store i32 0, ptr %p3, align 4
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indirectbr ptr %p1, [label %loop.latch1, label %loop.latch2]
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loop.latch1: ; preds = %loop.header
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%c = call i1 @cond()
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br i1 %c, label %loop.header, label %exit
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loop.latch2: ; preds = %loop.header
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indirectbr ptr %p2, [label %loop.header, label %exit]
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exit: ; preds = %loop.latch2, %loop.latch1
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%x = load i32, ptr %p3, align 4
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%y = add i32 %x, 0
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ret i32 %y
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}
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