derek.holloway
7502bf64a4
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88 lines
2.1 KiB
LLVM
88 lines
2.1 KiB
LLVM
; RUN: opt < %s -passes=lcssa -S -o - | FileCheck %s
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target triple = "x86_64-unknown-linux-gnu"
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; PR28424
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; Here LCSSA adds phi-nodes for %x into the loop exits. Then, SSAUpdater needs
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; to insert phi-nodes to merge these values. That creates a new def, which in
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; its turn needs another LCCSA phi-node, and this test ensures that we insert
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; it.
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; CHECK-LABEL: @foo1
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define internal i32 @foo1(i1 %arg) {
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entry:
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br label %header
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header:
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%x = add i32 0, 1
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br i1 %arg, label %if, label %loopexit1
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if:
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br i1 %arg, label %latch, label %loopexit2
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latch:
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br i1 %arg, label %header, label %loopexit3
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; CHECK: loopexit1:
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; CHECK: %x.lcssa = phi i32 [ %x, %header ]
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loopexit1:
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br label %loop_with_insert_point
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; CHECK: loopexit2:
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; CHECK: %x.lcssa1 = phi i32 [ %x, %if ]
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loopexit2:
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br label %exit
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; CHECK: loopexit3:
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; CHECK: %x.lcssa2 = phi i32 [ %x, %latch ]
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loopexit3:
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br label %loop_with_insert_point
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; CHECK: loop_with_insert_point:
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; CHECK: %x4 = phi i32 [ %x4, %loop_with_insert_point ], [ %x.lcssa2, %loopexit3 ], [ %x.lcssa, %loopexit1 ]
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loop_with_insert_point:
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br i1 %arg, label %loop_with_insert_point, label %bb
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; CHECK: bb:
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; CHECK: %x4.lcssa = phi i32 [ %x4, %loop_with_insert_point ]
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bb:
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br label %exit
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; CHECK: exit:
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; CHECK: %x3 = phi i32 [ %x4.lcssa, %bb ], [ %x.lcssa1, %loopexit2 ]
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exit:
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ret i32 %x
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}
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; CHECK-LABEL: @foo2
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define internal i32 @foo2(i1 %arg) {
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entry:
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br label %header
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header:
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%x = add i32 0, 1
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br i1 %arg, label %latch, label %loopexit1
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latch:
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br i1 %arg, label %header, label %loopexit2
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; CHECK: loopexit1:
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; CHECK: %x.lcssa = phi i32 [ %x, %header ]
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loopexit1:
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br label %loop_with_insert_point
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; CHECK: loopexit2:
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; CHECK: %x.lcssa1 = phi i32 [ %x, %latch ]
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loopexit2:
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br label %loop_with_insert_point
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; CHECK: loop_with_insert_point:
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; CHECK: %x2 = phi i32 [ %x2, %loop_with_insert_point ], [ %x.lcssa1, %loopexit2 ], [ %x.lcssa, %loopexit1 ]
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loop_with_insert_point:
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br i1 %arg, label %loop_with_insert_point, label %exit
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; CHECK: exit:
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; CHECK: %x2.lcssa = phi i32 [ %x2, %loop_with_insert_point ]
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exit:
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ret i32 %x
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}
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