forked from OSchip/llvm-project
52 lines
2.0 KiB
LLVM
52 lines
2.0 KiB
LLVM
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; RUN: opt -analyze -scalar-evolution -S < %s | FileCheck %s
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; The exit value from this loop was originally calculated as 0.
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; The actual exit condition is 256*256 == 0 (in i16).
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; CHECK: Printing analysis 'Scalar Evolution Analysis' for function 'f0':
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; CHECK-NEXT: Classifying expressions for: @f0
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; CHECK-NEXT: %v1 = phi i16 [ 0, %b0 ], [ %v2, %b1 ]
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; CHECK-NEXT: --> {0,+,-1}<%b1> U: [-255,1) S: [-255,1) Exits: -255 LoopDispositions: { %b1: Computable }
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; CHECK-NEXT: %v2 = add i16 %v1, -1
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; CHECK-NEXT: --> {-1,+,-1}<%b1> U: [-256,0) S: [-256,0) Exits: -256 LoopDispositions: { %b1: Computable }
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; CHECK-NEXT: %v3 = mul i16 %v2, %v2
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; CHECK-NEXT: --> {1,+,3,+,2}<%b1> U: full-set S: full-set Exits: 0 LoopDispositions: { %b1: Computable }
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; CHECK-NEXT: %v5 = phi i16 [ %v2, %b1 ]
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; CHECK-NEXT: --> %v5 U: [-256,0) S: [-256,0)
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; CHECK-NEXT: %v6 = phi i16 [ %v3, %b1 ]
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; CHECK-NEXT: --> %v6 U: full-set S: full-set
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; CHECK-NEXT: %v7 = sext i16 %v5 to i32
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; CHECK-NEXT: --> (sext i16 %v5 to i32) U: [-256,0) S: [-256,0)
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; CHECK-NEXT: Determining loop execution counts for: @f0
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; CHECK-NEXT: Loop %b1: backedge-taken count is 255
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; CHECK-NEXT: Loop %b1: max backedge-taken count is 255
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; CHECK-NEXT: Loop %b1: Predicated backedge-taken count is 255
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; CHECK-NEXT: Predicates:
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; CHECK-EMPTY:
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; CHECK-NEXT: Loop %b1: Trip multiple is 256
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@g0 = global i32 0, align 4
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@g1 = global i16 0, align 2
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define signext i32 @f0() {
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b0:
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br label %b1
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b1: ; preds = %b1, %b0
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%v1 = phi i16 [ 0, %b0 ], [ %v2, %b1 ]
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%v2 = add i16 %v1, -1
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%v3 = mul i16 %v2, %v2
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%v4 = icmp eq i16 %v3, 0
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br i1 %v4, label %b2, label %b1
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b2: ; preds = %b1
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%v5 = phi i16 [ %v2, %b1 ]
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%v6 = phi i16 [ %v3, %b1 ]
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%v7 = sext i16 %v5 to i32
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store i32 %v7, i32* @g0, align 4
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store i16 %v6, i16* @g1, align 2
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ret i32 0
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}
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