derek.holloway
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85 lines
3.8 KiB
LLVM
85 lines
3.8 KiB
LLVM
; Remove 'S' Scalar Dependencies #119345
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; Scalar dependencies are not handled correctly, so they were removed to avoid
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; miscompiles. The loop nest in this test case used to be interchanged, but it's
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; no longer triggering. XFAIL'ing this test to indicate that this test should
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; interchanged if scalar deps are handled correctly.
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;
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; XFAIL: *
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; RUN: opt < %s -passes=loop-interchange -verify-dom-info -verify-loop-info -pass-remarks-output=%t -disable-output
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; RUN: FileCheck -input-file %t %s
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@a = common global i32 0, align 4
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@d = common dso_local local_unnamed_addr global [1 x [6 x i32]] zeroinitializer, align 4
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; After interchanging the innermost and the middle loop, we should not continue
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; doing interchange for the (new) middle loop and the outermost loop, because of
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; values defined in the new innermost loop not available in the exiting block of
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; the entire loop nest.
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;
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; CHECK: --- !Passed
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; CHECK: Pass: loop-interchange
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; CHECK: Name: Interchanged
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; CHECK: Function: innermost_latch_uses_values_in_middle_header
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; CHECK: Args:
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; CHECK: - String: Loop interchanged with enclosing loop.
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; CHECK: ...
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; CHECK: --- !Missed
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; CHECK: Pass: loop-interchange
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; CHECK: Name: UnsupportedInnerLatchPHI
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; CHECK: Function: innermost_latch_uses_values_in_middle_header
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; CHECK: Args:
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; CHECK: - String: Cannot interchange loops because unsupported PHI nodes found in inner loop latch.
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; CHECK: ...
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; CHECK: --- !Missed
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; CHECK: Pass: loop-interchange
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; CHECK: Name: UnsupportedExitPHI
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; CHECK: Function: innermost_latch_uses_values_in_middle_header
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; CHECK: Args:
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; CHECK: - String: Found unsupported PHI node in loop exit.
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; CHECK: ...
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;
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define void @innermost_latch_uses_values_in_middle_header() {
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entry:
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%0 = load i32, ptr @a, align 4
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%b = add i32 80, 1
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br label %outermost.header
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outermost.header: ; preds = %outermost.latch, %entry
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%indvar.outermost = phi i32 [ 10, %entry ], [ %indvar.outermost.next, %outermost.latch ]
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%tobool71.i = icmp eq i32 %0, 0
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br i1 %tobool71.i, label %middle.header, label %outermost.latch
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middle.header: ; preds = %middle.latch, %outermost.header
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%indvar.middle = phi i64 [ 4, %outermost.header ], [ %indvar.middle.next, %middle.latch ]
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%indvar.middle.wide = zext i32 %b to i64 ; a def in the middle header
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br label %innermost.header
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innermost.header: ; preds = %middle.header, %innermost.latch
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%indvar.innermost = phi i64 [ %indvar.innermost.next, %innermost.latch ], [ 4, %middle.header ]
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br label %innermost.body
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innermost.body: ; preds = %innermost.header
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%arrayidx9.i = getelementptr inbounds [1 x [6 x i32]], ptr @d, i64 0, i64 %indvar.innermost, i64 %indvar.middle
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store i32 0, ptr %arrayidx9.i, align 4
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br label %innermost.latch
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innermost.latch: ; preds = %innermost.body
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%indvar.innermost.next = add nsw i64 %indvar.innermost, 1
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%tobool5.i = icmp eq i64 %indvar.innermost.next, %indvar.middle.wide ; corresponding use in the innermost latch
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br i1 %tobool5.i, label %middle.latch, label %innermost.header
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middle.latch: ; preds = %innermost.latch
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%indvar.middle.next = add nsw i64 %indvar.middle, -1
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%tobool2.i = icmp eq i64 %indvar.middle.next, 0
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br i1 %tobool2.i, label %outermost.latch, label %middle.header
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outermost.latch: ; preds = %middle.latch, %outermost.header
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%indvar.outermost.next = add nsw i32 %indvar.outermost, -5
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%tobool.i = icmp eq i32 %indvar.outermost.next, 0
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br i1 %tobool.i, label %outermost.exit, label %outermost.header
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outermost.exit: ; preds = %outermost.latch
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ret void
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}
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