derek.holloway
7502bf64a4
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69 lines
4.0 KiB
LLVM
69 lines
4.0 KiB
LLVM
; RUN: opt < %s -passes='print<scalar-evolution>,loop(loop-rotate),invalidate<scalar-evolution>,print<scalar-evolution>' -disable-output 2>&1 | FileCheck -check-prefixes CHECK-SCEV %s
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; RUN: opt < %s -passes='print<scalar-evolution>,loop(loop-rotate),print<scalar-evolution>' -disable-output 2>&1 | FileCheck -check-prefixes CHECK-SCEV %s
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; RUN: opt < %s -passes='loop(canon-freeze),loop(loop-rotate),print<scalar-evolution>' -disable-output
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; In the first two RUN lines print<scalar-evolution> is used to populate the
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; analysis cache before loop-rotate. That was enough to see the problem by
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; examining print<scalar-evolution> printouts after loop-rotate. However, the
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; crashes where only observed when using canon-freeze as a trigger to populate
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; the analysis cache, so that is why canon-freeze is used in the third RUN
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; line.
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; Verify that we get the same SCEV expressions after loop-rotate, regardless
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; if we invalidate scalar-evolution before the final printing or not.
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;
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; This used to fail as described by PR51981 (some expressions still referred
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; to (trunc i32 %div210 to i16) but after the rotation it should be (trunc i32
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; %div2102 to i16).
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;
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; CHECK-SCEV: Classifying expressions for: @test_function
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; CHECK-SCEV: %wide = load i32, ptr @offset, align 1
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; CHECK-SCEV: --> %wide U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %loop.outer.header: Variant, %loop.inner: Invariant }
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; CHECK-SCEV: %narrow = trunc i32 %wide to i16
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; CHECK-SCEV: --> (trunc i32 %wide to i16) U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %loop.outer.header: Variant, %loop.inner: Invariant }
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; CHECK-SCEV: %iv = phi i16 [ %narrow, %loop.inner.ph ], [ %iv.plus, %loop.inner ]
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; CHECK-SCEV: --> {(trunc i32 %wide to i16),+,1}<nw><%loop.inner> U: full-set S: full-set Exits: (-1 + (700 umax (1 + (trunc i32 %wide to i16)))) LoopDispositions: { %loop.inner: Computable, %loop.outer.header: Variant }
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;
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; CHECK-SCEV: Classifying expressions for: @test_function
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; CHECK-SCEV: %wide1 = load i32, ptr @offset, align 1
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; CHECK-SCEV: --> %wide1 U: full-set S: full-set
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; CHECK-SCEV: %wide2 = phi i32 [ %wide1, %loop.inner.ph.lr.ph ], [ %wide, %loop.outer.latch ]
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; CHECK-SCEV: --> %wide2 U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %loop.inner.ph: Variant, %loop.inner: Invariant }
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; CHECK-SCEV: %narrow = trunc i32 %wide2 to i16
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; CHECK-SCEV: --> (trunc i32 %wide2 to i16) U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %loop.inner.ph: Variant, %loop.inner: Invariant }
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; CHECK-SCEV: %iv = phi i16 [ %narrow, %loop.inner.ph ], [ %iv.plus, %loop.inner ]
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; CHECK-SCEV: --> {(trunc i32 %wide2 to i16),+,1}<nw><%loop.inner> U: full-set S: full-set Exits: (-1 + (700 umax (1 + (trunc i32 %wide2 to i16)))) LoopDispositions: { %loop.inner: Computable, %loop.inner.ph: Variant }
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@offset = external dso_local global i32, align 1
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@array = internal global [11263 x i32] zeroinitializer, align 1
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define void @test_function(i1 %cond) {
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entry:
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br label %loop.outer.header
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loop.outer.header: ; preds = %loop.outer.latch, %entry
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%wide = load i32, ptr @offset, align 1
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br i1 %cond, label %exit, label %loop.inner.ph
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loop.inner.ph: ; preds = %loop.outer.header
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%narrow = trunc i32 %wide to i16
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br label %loop.inner
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loop.inner: ; preds = %loop.inner, %loop.inner.ph
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%iv = phi i16 [ %narrow, %loop.inner.ph ], [ %iv.plus, %loop.inner ]
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%iv.promoted = zext i16 %iv to i32
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%gep = getelementptr inbounds [11263 x i32], ptr @array, i32 0, i32 %iv.promoted
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store i32 7, ptr %gep, align 1
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%iv.plus = add i16 %iv, 1
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%cmp = icmp ult i16 %iv.plus, 700
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br i1 %cmp, label %loop.inner, label %loop.outer.latch
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loop.outer.latch: ; preds = %loop.inner
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br label %loop.outer.header
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exit: ; preds = %loop.outer.header
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ret void
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}
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