derek.holloway
7502bf64a4
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61 lines
2.1 KiB
LLVM
61 lines
2.1 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>" < %s 2>&1 | FileCheck %s
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; The obvious case.
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define i32 @div(i32 %val) nounwind {
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; CHECK-LABEL: 'div'
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; CHECK-NEXT: Classifying expressions for: @div
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; CHECK-NEXT: %tmp1 = udiv i32 %val, 16
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; CHECK-NEXT: --> (%val /u 16) U: [0,268435456) S: [0,268435456)
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; CHECK-NEXT: %tmp2 = mul i32 %tmp1, 16
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; CHECK-NEXT: --> (16 * (%val /u 16))<nuw> U: [0,-15) S: [-2147483648,2147483633)
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; CHECK-NEXT: Determining loop execution counts for: @div
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;
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%tmp1 = udiv i32 %val, 16
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%tmp2 = mul i32 %tmp1, 16
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ret i32 %tmp2
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}
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define i32 @sdiv(i32 %val) nounwind {
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; CHECK-LABEL: 'sdiv'
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; CHECK-NEXT: Classifying expressions for: @sdiv
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; CHECK-NEXT: %tmp1 = sdiv i32 %val, 16
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; CHECK-NEXT: --> %tmp1 U: [-134217728,134217728) S: [-134217728,134217728)
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; CHECK-NEXT: %tmp2 = mul i32 %tmp1, 16
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; CHECK-NEXT: --> (16 * %tmp1)<nsw> U: [0,-15) S: [-2147483648,2147483633)
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; CHECK-NEXT: Determining loop execution counts for: @sdiv
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;
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%tmp1 = sdiv i32 %val, 16
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%tmp2 = mul i32 %tmp1, 16
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ret i32 %tmp2
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}
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; Or, it could be a number of equivalent patterns with mask:
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; b) x & (-1 << nbits)
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; d) x >> nbits << nbits
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define i32 @mask_b(i32 %val) nounwind {
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; CHECK-LABEL: 'mask_b'
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; CHECK-NEXT: Classifying expressions for: @mask_b
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; CHECK-NEXT: %masked = and i32 %val, -16
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; CHECK-NEXT: --> (16 * (%val /u 16))<nuw> U: [0,-15) S: [-2147483648,2147483633)
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; CHECK-NEXT: Determining loop execution counts for: @mask_b
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;
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%masked = and i32 %val, -16
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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: %lowbitscleared = lshr i32 %val, 4
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; CHECK-NEXT: --> (%val /u 16) U: [0,268435456) S: [0,268435456)
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; CHECK-NEXT: %masked = shl i32 %lowbitscleared, 4
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; CHECK-NEXT: --> (16 * (%val /u 16))<nuw> U: [0,-15) S: [-2147483648,2147483633)
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; CHECK-NEXT: Determining loop execution counts for: @mask_d
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;
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%lowbitscleared = lshr i32 %val, 4
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%masked = shl i32 %lowbitscleared, 4
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ret i32 %masked
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}
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