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[Test] Add test showing missing opportunity in range inference for SCEV
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‎llvm/test/Analysis/ScalarEvolution/outer_phi.ll

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; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
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; RUN: opt < %s -S -disable-output "-passes=print<scalar-evolution>" 2>&1 | FileCheck %s
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declare i1 @cond()
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define i32 @test_01(i32 %a, i32 %b) {
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; CHECK-LABEL: 'test_01'
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; CHECK-NEXT: Classifying expressions for: @test_01
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; CHECK-NEXT: %outer.iv = phi i32 [ 0, %entry ], [ %iv.next, %outer.backedge ]
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; CHECK-NEXT: --> %outer.iv U: [0,-2147483647) S: [0,-2147483647) Exits: <<Unknown>> LoopDispositions: { %outer: Variant, %inner: Invariant }
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; CHECK-NEXT: %iv = phi i32 [ 0, %outer ], [ %iv.next, %inner.backedge ]
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; CHECK-NEXT: --> {0,+,1}<nuw><nsw><%inner> U: [0,-2147483648) S: [0,-2147483648) Exits: <<Unknown>> LoopDispositions: { %inner: Computable, %outer: Variant }
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; CHECK-NEXT: %iv.next = add nuw nsw i32 %iv, 1
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; CHECK-NEXT: --> {1,+,1}<nuw><%inner> U: [1,-2147483647) S: [1,-2147483647) Exits: <<Unknown>> LoopDispositions: { %inner: Computable, %outer: Variant }
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; CHECK-NEXT: %inner.loop.cond = call i1 @cond()
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; CHECK-NEXT: --> %inner.loop.cond U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %inner: Variant, %outer: Variant }
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; CHECK-NEXT: %outer.loop.cond = call i1 @cond()
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; CHECK-NEXT: --> %outer.loop.cond U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %outer: Variant, %inner: Invariant }
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; CHECK-NEXT: Determining loop execution counts for: @test_01
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; CHECK-NEXT: Loop %inner: <multiple exits> Unpredictable backedge-taken count.
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; CHECK-NEXT: exit count for inner: %b
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; CHECK-NEXT: exit count for inner.backedge: ***COULDNOTCOMPUTE***
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; CHECK-NEXT: Loop %inner: max backedge-taken count is 2147483647
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; CHECK-NEXT: Loop %inner: Unpredictable predicated backedge-taken count.
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; CHECK-NEXT: Loop %outer: <multiple exits> Unpredictable backedge-taken count.
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; CHECK-NEXT: exit count for inner: ***COULDNOTCOMPUTE***
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; CHECK-NEXT: exit count for outer.backedge: ***COULDNOTCOMPUTE***
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; CHECK-NEXT: Loop %outer: Unpredictable max backedge-taken count.
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; CHECK-NEXT: Loop %outer: Unpredictable predicated backedge-taken count.
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;
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entry:
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%b_is_non_negative = icmp sge i32 %b, 0
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br i1 %b_is_non_negative, label %outer, label %failure
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outer:
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%outer.iv = phi i32 [0, %entry], [%iv.next, %outer.backedge]
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br label %inner
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inner:
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%iv = phi i32 [0, %outer], [%iv.next, %inner.backedge]
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%signed_cond = icmp slt i32 %iv, %b
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br i1 %signed_cond, label %inner.backedge, label %side.exit
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inner.backedge:
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%iv.next = add nuw nsw i32 %iv, 1
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%inner.loop.cond = call i1 @cond()
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br i1 %inner.loop.cond, label %inner, label %outer.backedge
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outer.backedge:
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%outer.loop.cond = call i1 @cond()
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br i1 %outer.loop.cond, label %outer, label %exit
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failure:
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unreachable
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side.exit:
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ret i32 0
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exit:
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ret i32 1
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}
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; FIXME: both outer.iv and iv here can be proved non-negative.
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define i32 @test_02(i32 %a, i32 %b) {
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; CHECK-LABEL: 'test_02'
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; CHECK-NEXT: Classifying expressions for: @test_02
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; CHECK-NEXT: %outer.iv = phi i32 [ 0, %entry ], [ %iv.next, %outer.backedge ]
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; CHECK-NEXT: --> %outer.iv U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %outer: Variant, %inner: Invariant }
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; CHECK-NEXT: %iv = phi i32 [ %outer.iv, %outer ], [ %iv.next, %inner.backedge ]
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; CHECK-NEXT: --> {%outer.iv,+,1}<nuw><nsw><%inner> U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %inner: Computable, %outer: Variant }
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; CHECK-NEXT: %iv.next = add nuw nsw i32 %iv, 1
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; CHECK-NEXT: --> {(1 + %outer.iv),+,1}<nw><%inner> U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %inner: Computable, %outer: Variant }
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; CHECK-NEXT: %inner.loop.cond = call i1 @cond()
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; CHECK-NEXT: --> %inner.loop.cond U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %inner: Variant, %outer: Variant }
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; CHECK-NEXT: %outer.loop.cond = call i1 @cond()
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; CHECK-NEXT: --> %outer.loop.cond U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %outer: Variant, %inner: Invariant }
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; CHECK-NEXT: Determining loop execution counts for: @test_02
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; CHECK-NEXT: Loop %inner: <multiple exits> Unpredictable backedge-taken count.
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; CHECK-NEXT: exit count for inner: ((-1 * %outer.iv) + (%b smax %outer.iv))
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; CHECK-NEXT: exit count for inner.backedge: ***COULDNOTCOMPUTE***
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; CHECK-NEXT: Loop %inner: max backedge-taken count is -1
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; CHECK-NEXT: Loop %inner: Unpredictable predicated backedge-taken count.
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; CHECK-NEXT: Loop %outer: <multiple exits> Unpredictable backedge-taken count.
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; CHECK-NEXT: exit count for inner: ***COULDNOTCOMPUTE***
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; CHECK-NEXT: exit count for outer.backedge: ***COULDNOTCOMPUTE***
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; CHECK-NEXT: Loop %outer: Unpredictable max backedge-taken count.
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; CHECK-NEXT: Loop %outer: Unpredictable predicated backedge-taken count.
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;
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entry:
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%b_is_non_negative = icmp sge i32 %b, 0
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br i1 %b_is_non_negative, label %outer, label %failure
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outer:
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%outer.iv = phi i32 [0, %entry], [%iv.next, %outer.backedge]
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br label %inner
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inner:
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%iv = phi i32 [%outer.iv, %outer], [%iv.next, %inner.backedge]
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%signed_cond = icmp slt i32 %iv, %b
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br i1 %signed_cond, label %inner.backedge, label %side.exit
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inner.backedge:
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%iv.next = add nuw nsw i32 %iv, 1
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%inner.loop.cond = call i1 @cond()
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br i1 %inner.loop.cond, label %inner, label %outer.backedge
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outer.backedge:
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%outer.loop.cond = call i1 @cond()
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br i1 %outer.loop.cond, label %outer, label %exit
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failure:
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unreachable
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side.exit:
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ret i32 0
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exit:
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ret i32 1
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}

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