forked from OSchip/llvm-project
46 lines
2.3 KiB
LLVM
46 lines
2.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
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; RUN: opt -analyze -enable-new-pm=0 -scalar-evolution < %s | FileCheck %s
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; RUN: opt -disable-output "-passes=print<scalar-evolution>" < %s 2>&1 | FileCheck %s
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define void @f(i1 %c) {
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; CHECK-LABEL: 'f'
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; CHECK-NEXT: Classifying expressions for: @f
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; CHECK-NEXT: %start = select i1 %c, i32 100, i32 0
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; CHECK-NEXT: --> %start U: [0,101) S: [0,101)
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; CHECK-NEXT: %step = select i1 %c, i32 -1, i32 1
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; CHECK-NEXT: --> %step U: [1,0) S: [-2,2)
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; CHECK-NEXT: %iv = phi i32 [ %start, %entry ], [ %iv.dec, %loop ]
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; CHECK-NEXT: --> {%start,+,%step}<nsw><%loop> U: [0,101) S: [0,101) Exits: ((99 * %step)<nsw> + %start) LoopDispositions: { %loop: Computable }
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; CHECK-NEXT: %iv.tc = phi i32 [ 0, %entry ], [ %iv.tc.inc, %loop ]
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; CHECK-NEXT: --> {0,+,1}<%loop> U: [0,100) S: [0,100) Exits: 99 LoopDispositions: { %loop: Computable }
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; CHECK-NEXT: %iv.tc.inc = add i32 %iv.tc, 1
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; CHECK-NEXT: --> {1,+,1}<%loop> U: [1,101) S: [1,101) Exits: 100 LoopDispositions: { %loop: Computable }
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; CHECK-NEXT: %iv.dec = add nsw i32 %iv, %step
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; CHECK-NEXT: --> {(%step + %start),+,%step}<nw><%loop> U: [-200,201) S: [-200,201) Exits: ((100 * %step)<nsw> + %start) LoopDispositions: { %loop: Computable }
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; CHECK-NEXT: %iv.sext = sext i32 %iv to i64
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; CHECK-NEXT: --> {(zext i32 %start to i64),+,(sext i32 %step to i64)}<nsw><%loop> U: [0,101) S: [0,101) Exits: ((zext i32 %start to i64) + (99 * (sext i32 %step to i64))<nsw>) LoopDispositions: { %loop: Computable }
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; CHECK-NEXT: Determining loop execution counts for: @f
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; CHECK-NEXT: Loop %loop: backedge-taken count is 99
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; CHECK-NEXT: Loop %loop: max backedge-taken count is 99
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; CHECK-NEXT: Loop %loop: Predicated backedge-taken count is 99
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; CHECK-NEXT: Predicates:
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; CHECK: Loop %loop: Trip multiple is 100
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;
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entry:
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%start = select i1 %c, i32 100, i32 0
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%step = select i1 %c, i32 -1, i32 1
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br label %loop
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loop:
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%iv = phi i32 [ %start, %entry ], [ %iv.dec, %loop ]
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%iv.tc = phi i32 [ 0, %entry ], [ %iv.tc.inc, %loop ]
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%iv.tc.inc = add i32 %iv.tc, 1
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%iv.dec = add nsw i32 %iv, %step
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%iv.sext = sext i32 %iv to i64
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%be = icmp ne i32 %iv.tc.inc, 100
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br i1 %be, label %loop, label %leave
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leave:
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ret void
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}
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