50 lines
1.8 KiB
LLVM
50 lines
1.8 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
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; RUN: opt -S -analyze -enable-new-pm=0 -scalar-evolution < %s | FileCheck %s
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; RUN: opt -S -disable-output "-passes=print<scalar-evolution>" < %s 2>&1 | FileCheck %s
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; The obvious case.
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define i32 @mul(i32 %val) nounwind {
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; CHECK-LABEL: 'mul'
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; CHECK-NEXT: Classifying expressions for: @mul
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; CHECK-NEXT: %tmp1 = mul i32 %val, 16
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; CHECK-NEXT: --> (16 * %val) U: [0,-15) S: [-2147483648,2147483633)
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; CHECK-NEXT: %tmp2 = udiv i32 %tmp1, 16
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; CHECK-NEXT: --> ((16 * %val) /u 16) U: [0,268435456) S: [0,268435456)
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; CHECK-NEXT: Determining loop execution counts for: @mul
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;
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%tmp1 = mul i32 %val, 16
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%tmp2 = udiv i32 %tmp1, 16
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ret i32 %tmp2
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}
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; Or, it could be any number of equivalent patterns with mask:
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; a) x & (1 << nbits) - 1
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; b) x & ~(-1 << nbits)
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; c) x & (-1 >> (32 - y))
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; d) x << (32 - y) >> (32 - y)
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define i32 @mask_abc(i32 %val) nounwind {
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; CHECK-LABEL: 'mask_abc'
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; CHECK-NEXT: Classifying expressions for: @mask_abc
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; CHECK-NEXT: %masked = and i32 %val, 15
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; CHECK-NEXT: --> (zext i4 (trunc i32 %val to i4) to i32) U: [0,16) S: [0,16)
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; CHECK-NEXT: Determining loop execution counts for: @mask_abc
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;
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%masked = and i32 %val, 15
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ret i32 %masked
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}
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define i32 @mask_d(i32 %val) nounwind {
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; CHECK-LABEL: 'mask_d'
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; CHECK-NEXT: Classifying expressions for: @mask_d
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; CHECK-NEXT: %highbitscleared = shl i32 %val, 4
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; CHECK-NEXT: --> (16 * %val) U: [0,-15) S: [-2147483648,2147483633)
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; CHECK-NEXT: %masked = lshr i32 %highbitscleared, 4
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; CHECK-NEXT: --> ((16 * %val) /u 16) U: [0,268435456) S: [0,268435456)
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; CHECK-NEXT: Determining loop execution counts for: @mask_d
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;
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%highbitscleared = shl i32 %val, 4
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%masked = lshr i32 %highbitscleared, 4
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ret i32 %masked
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}
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