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; Remove 'S' Scalar Dependencies #119345
; Scalar dependencies are not handled correctly, so they were removed to avoid
; miscompiles. The loop nest in this test case used to be interchanged, but it's
; no longer triggering. XFAIL'ing this test to indicate that this test should
; interchanged if scalar deps are handled correctly.
;
; XFAIL: *
; RUN: opt -passes=loop-interchange -cache-line-size=64 -verify-loop-lcssa %s -pass-remarks-output=%t -disable-output
; RUN: FileCheck -input-file %t %s
; Tests for PR43797.
@wdtdr = external dso_local global [5 x [5 x double]], align 16
; CHECK: --- !Passed
; CHECK-NEXT: Pass: loop-interchange
; CHECK-NEXT: Name: Interchanged
; CHECK-NEXT: Function: test1
; CHECK-NEXT: Args:
; CHECK-NEXT: - String: Loop interchanged with enclosing loop.
; CHECK-NEXT: ...
define void @test1() {
entry:
br label %outer.header
outer.header: ; preds = %for.inc27, %entry
%outer.idx = phi i64 [ 0, %entry ], [ %outer.idx.inc, %outer.latch ]
%arrayidx8 = getelementptr inbounds [5 x [5 x double]], ptr @wdtdr, i64 0, i64 0, i64 %outer.idx
br label %inner.header
inner.header: ; preds = %for.inc, %for.body
%inner.idx = phi i64 [ 0, %outer.header ], [ %inner.idx.inc, %inner.latch]
%0 = load double, ptr %arrayidx8, align 8
store double undef, ptr %arrayidx8, align 8
br label %inner.latch
inner.latch: ; preds = %for.body6
%inner.idx.inc = add nsw i64 %inner.idx, 1
br i1 false, label %inner.header, label %inner.exit
inner.exit: ; preds = %for.inc
%outer.v = add nsw i64 %outer.idx, 1
br label %outer.latch
outer.latch: ; preds = %for.end
%outer.idx.inc = add nsw i64 %outer.idx, 1
br i1 false, label %outer.header, label %outer.exit
outer.exit: ; preds = %for.inc27
%exit1.lcssa = phi i64 [ %outer.v, %outer.latch ]
%exit2.lcssa = phi i64 [ %outer.idx.inc, %outer.latch ]
ret void
}
; CHECK: --- !Passed
; CHECK-NEXT: Pass: loop-interchange
; CHECK-NEXT: Name: Interchanged
; CHECK-NEXT: Function: test2
; CHECK-NEXT: Args:
; CHECK-NEXT: - String: Loop interchanged with enclosing loop.
; CHECK-NEXT: ...
define void @test2(i1 %cond) {
entry:
br i1 %cond, label %outer.header, label %outer.exit
outer.header: ; preds = %for.inc27, %entry
%outer.idx = phi i64 [ 0, %entry ], [ %outer.idx.inc, %outer.latch ]
%arrayidx8 = getelementptr inbounds [5 x [5 x double]], ptr @wdtdr, i64 0, i64 0, i64 %outer.idx
br label %inner.header
inner.header: ; preds = %for.inc, %for.body
%inner.idx = phi i64 [ 0, %outer.header ], [ %inner.idx.inc, %inner.latch]
%0 = load double, ptr %arrayidx8, align 8
store double undef, ptr %arrayidx8, align 8
br label %inner.latch
inner.latch: ; preds = %for.body6
%inner.idx.inc = add nsw i64 %inner.idx , 1
br i1 false, label %inner.header, label %inner.exit
inner.exit: ; preds = %for.inc
%outer.v = add nsw i64 %outer.idx, 1
br label %outer.latch
outer.latch: ; preds = %for.end
%outer.idx.inc = add nsw i64 %outer.idx, 1
br i1 false, label %outer.header, label %outer.exit
outer.exit: ; preds = %for.inc27
%exit1.lcssa = phi i64 [ 0, %entry ], [ %outer.v, %outer.latch ]
%exit2.lcssa = phi i64 [ 0, %entry ], [ %outer.idx.inc, %outer.latch ]
ret void
}
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