8b5b294ec2
When printing the result of SCEV's analysis, we can avoid printing the predicated backedge taken count and the predicates if the predicates are empty and no new information is provided. This helps to reduce the verbosity of the output.
42 lines
1.9 KiB
LLVM
42 lines
1.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
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; RUN: opt < %s -disable-output "-passes=print<scalar-evolution>" 2>&1 | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; Previously in this case the max backedge count would be computed as 1/0, which
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; is correct but undesirable. It would also not fold as a constant, tripping
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; asserts in SCEV.
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define void @pluto(i32 %arg) {
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; CHECK-LABEL: 'pluto'
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; CHECK-NEXT: Classifying expressions for: @pluto
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; CHECK-NEXT: %tmp = ashr i32 %arg, 31
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; CHECK-NEXT: --> %tmp U: [-1,1) S: [-1,1)
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; CHECK-NEXT: %tmp1 = add nsw i32 %tmp, 2
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; CHECK-NEXT: --> (2 + %tmp)<nsw> U: [1,3) S: [1,3)
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; CHECK-NEXT: %tmp3 = phi i32 [ 0, %bb ], [ %tmp4, %bb2 ]
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; CHECK-NEXT: --> {0,+,(2 + %tmp)<nsw>}<nuw><nsw><%bb2> U: [0,3) S: [0,3) Exits: ((2 + %tmp)<nsw> * (1 /u (2 + %tmp)<nsw>))<nuw> LoopDispositions: { %bb2: Computable }
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; CHECK-NEXT: %tmp4 = add nuw nsw i32 %tmp1, %tmp3
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; CHECK-NEXT: --> {(2 + %tmp)<nsw>,+,(2 + %tmp)<nsw>}<nuw><nsw><%bb2> U: [1,5) S: [1,5) Exits: (2 + ((2 + %tmp)<nsw> * (1 /u (2 + %tmp)<nsw>))<nuw> + %tmp) LoopDispositions: { %bb2: Computable }
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; CHECK-NEXT: Determining loop execution counts for: @pluto
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; CHECK-NEXT: Loop %bb2: backedge-taken count is (1 /u (2 + %tmp)<nsw>)
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; CHECK-NEXT: Loop %bb2: constant max backedge-taken count is i32 1
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; CHECK-NEXT: Loop %bb2: symbolic max backedge-taken count is (1 /u (2 + %tmp)<nsw>)
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; CHECK-NEXT: Loop %bb2: Trip multiple is 1
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;
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bb:
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%tmp = ashr i32 %arg, 31
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%tmp1 = add nsw i32 %tmp, 2
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br label %bb2
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bb2: ; preds = %bb2, %bb
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%tmp3 = phi i32 [ 0, %bb ], [ %tmp4, %bb2 ]
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%tmp4 = add nuw nsw i32 %tmp1, %tmp3
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%tmp5 = icmp ult i32 %tmp4, 2
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br i1 %tmp5, label %bb2, label %bb6
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bb6: ; preds = %bb2
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ret void
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}
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