derek.holloway
7502bf64a4
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106 lines
4.2 KiB
LLVM
106 lines
4.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py UTC_ARGS: --version 5
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; RUN: opt -passes='print<scalar-evolution>' -scalar-evolution-classify-expressions=0 -disable-output %s 2>&1 | FileCheck %s
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; %i and %i + 1 can overflow.
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define void @test1(i64 %x, ptr %a, ptr %b) {
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; CHECK-LABEL: 'test1'
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; CHECK-NEXT: Determining loop execution counts for: @test1
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; CHECK-NEXT: Loop %header: <multiple exits> Unpredictable backedge-taken count.
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; CHECK-NEXT: exit count for header: ***COULDNOTCOMPUTE***
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; CHECK-NEXT: exit count for latch: ***COULDNOTCOMPUTE***
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; CHECK-NEXT: predicated exit count for latch: (-1 + (1 umax %x))
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; CHECK-NEXT: Predicates:
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; CHECK-NEXT: {1,+,1}<%header> Added Flags: <nusw>
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; CHECK-EMPTY:
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; CHECK-NEXT: Loop %header: Unpredictable constant max backedge-taken count.
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; CHECK-NEXT: Loop %header: Unpredictable symbolic max backedge-taken count.
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; CHECK-NEXT: symbolic max exit count for header: ***COULDNOTCOMPUTE***
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; CHECK-NEXT: symbolic max exit count for latch: ***COULDNOTCOMPUTE***
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; CHECK-NEXT: predicated symbolic max exit count for latch: (-1 + (1 umax %x))
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; CHECK-NEXT: Predicates:
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; CHECK-NEXT: {1,+,1}<%header> Added Flags: <nusw>
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; CHECK-EMPTY:
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; CHECK-NEXT: Loop %header: Predicated constant max backedge-taken count is i64 -2
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; CHECK-NEXT: Predicates:
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; CHECK-NEXT: {1,+,1}<%header> Added Flags: <nusw>
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; CHECK-NEXT: Loop %header: Predicated symbolic max backedge-taken count is (-1 + (1 umax %x))
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; CHECK-NEXT: Predicates:
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; CHECK-NEXT: {1,+,1}<%header> Added Flags: <nusw>
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;
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entry:
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br label %header
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header:
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%conv11 = phi i64 [ 0, %entry ], [ %conv, %latch ]
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%i.010 = phi i32 [ 0, %entry ], [ %add, %latch ]
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%add = add i32 %i.010, 1
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%idxprom = zext i32 %add to i64
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%arrayidx = getelementptr inbounds i32, ptr %a, i64 %idxprom
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%ld = load i32, ptr %arrayidx, align 4
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%uncountable.c = icmp eq i32 %ld, 10
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br i1 %uncountable.c, label %exit, label %latch
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latch:
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%add2 = add nsw i32 %ld, 1
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%arrayidx4 = getelementptr inbounds i32, ptr %b, i64 %conv11
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store i32 %add2, ptr %arrayidx4, align 4
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%conv = zext i32 %add to i64
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%cmp = icmp ult i64 %conv, %x
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br i1 %cmp, label %header, label %exit
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exit:
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ret void
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}
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; %i can overflow.
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;
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; We need to check that i doesn't wrap, but we don't need a run-time alias
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; check. We also need an extra no-wrap check to get the backedge taken count.
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define void @test2(i64 %x, ptr %a) {
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; CHECK-LABEL: 'test2'
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; CHECK-NEXT: Determining loop execution counts for: @test2
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; CHECK-NEXT: Loop %header: <multiple exits> Unpredictable backedge-taken count.
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; CHECK-NEXT: exit count for header: ***COULDNOTCOMPUTE***
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; CHECK-NEXT: exit count for latch: ***COULDNOTCOMPUTE***
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; CHECK-NEXT: predicated exit count for latch: (-1 + (1 umax %x))
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; CHECK-NEXT: Predicates:
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; CHECK-NEXT: {1,+,1}<%header> Added Flags: <nusw>
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; CHECK-EMPTY:
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; CHECK-NEXT: Loop %header: Unpredictable constant max backedge-taken count.
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; CHECK-NEXT: Loop %header: Unpredictable symbolic max backedge-taken count.
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; CHECK-NEXT: symbolic max exit count for header: ***COULDNOTCOMPUTE***
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; CHECK-NEXT: symbolic max exit count for latch: ***COULDNOTCOMPUTE***
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; CHECK-NEXT: predicated symbolic max exit count for latch: (-1 + (1 umax %x))
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; CHECK-NEXT: Predicates:
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; CHECK-NEXT: {1,+,1}<%header> Added Flags: <nusw>
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; CHECK-EMPTY:
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; CHECK-NEXT: Loop %header: Predicated constant max backedge-taken count is i64 -2
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; CHECK-NEXT: Predicates:
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; CHECK-NEXT: {1,+,1}<%header> Added Flags: <nusw>
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; CHECK-NEXT: Loop %header: Predicated symbolic max backedge-taken count is (-1 + (1 umax %x))
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; CHECK-NEXT: Predicates:
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; CHECK-NEXT: {1,+,1}<%header> Added Flags: <nusw>
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;
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entry:
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br label %header
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header:
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%conv11 = phi i64 [ 0, %entry ], [ %conv, %latch ]
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%i.010 = phi i32 [ 0, %entry ], [ %inc, %latch ]
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%arrayidx = getelementptr inbounds i32, ptr %a, i64 %conv11
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%ld = load i32, ptr %arrayidx, align 4
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%uncountable.c = icmp eq i32 %ld, 10
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br i1 %uncountable.c, label %exit, label %latch
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latch:
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%add = add nsw i32 %ld, 1
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store i32 %add, ptr %arrayidx, align 4
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%inc = add i32 %i.010, 1
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%conv = zext i32 %inc to i64
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%cmp = icmp ult i64 %conv, %x
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br i1 %cmp, label %header, label %exit
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exit:
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ret void
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}
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