1; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
2; RUN: opt -S -analyze -scalar-evolution < %s | FileCheck %s
3
4; The obvious case.
5define i32 @div(i32 %val) nounwind {
6; CHECK-LABEL: 'div'
7; CHECK-NEXT:  Classifying expressions for: @div
8; CHECK-NEXT:    %tmp1 = udiv i32 %val, 16
9; CHECK-NEXT:    -->  (%val /u 16) U: [0,268435456) S: [0,268435456)
10; CHECK-NEXT:    %tmp2 = mul i32 %tmp1, 16
11; CHECK-NEXT:    -->  (16 * (%val /u 16))<nuw> U: [0,-15) S: [-2147483648,2147483633)
12; CHECK-NEXT:  Determining loop execution counts for: @div
13;
14  %tmp1 = udiv i32 %val, 16
15  %tmp2 = mul i32 %tmp1, 16
16  ret i32 %tmp2
17}
18
19define i32 @sdiv(i32 %val) nounwind {
20; CHECK-LABEL: 'sdiv'
21; CHECK-NEXT:  Classifying expressions for: @sdiv
22; CHECK-NEXT:    %tmp1 = sdiv i32 %val, 16
23; CHECK-NEXT:    -->  %tmp1 U: full-set S: [-134217728,134217728)
24; CHECK-NEXT:    %tmp2 = mul i32 %tmp1, 16
25; CHECK-NEXT:    -->  (16 * %tmp1)<nsw> U: [0,-15) S: [-2147483648,2147483633)
26; CHECK-NEXT:  Determining loop execution counts for: @sdiv
27;
28  %tmp1 = sdiv i32 %val, 16
29  %tmp2 = mul i32 %tmp1, 16
30  ret i32 %tmp2
31}
32
33; Or, it could be a number of equivalent patterns with mask:
34;   b) x &  (-1 << nbits)
35;   d) x >> nbits << nbits
36
37define i32 @mask_b(i32 %val) nounwind {
38; CHECK-LABEL: 'mask_b'
39; CHECK-NEXT:  Classifying expressions for: @mask_b
40; CHECK-NEXT:    %masked = and i32 %val, -16
41; CHECK-NEXT:    -->  (16 * (%val /u 16))<nuw> U: [0,-15) S: [-2147483648,2147483633)
42; CHECK-NEXT:  Determining loop execution counts for: @mask_b
43;
44  %masked = and i32 %val, -16
45  ret i32 %masked
46}
47
48define i32 @mask_d(i32 %val) nounwind {
49; CHECK-LABEL: 'mask_d'
50; CHECK-NEXT:  Classifying expressions for: @mask_d
51; CHECK-NEXT:    %lowbitscleared = lshr i32 %val, 4
52; CHECK-NEXT:    -->  (%val /u 16) U: [0,268435456) S: [0,268435456)
53; CHECK-NEXT:    %masked = shl i32 %lowbitscleared, 4
54; CHECK-NEXT:    -->  (16 * (%val /u 16))<nuw> U: [0,-15) S: [-2147483648,2147483633)
55; CHECK-NEXT:  Determining loop execution counts for: @mask_d
56;
57  %lowbitscleared = lshr i32 %val, 4
58  %masked = shl i32 %lowbitscleared, 4
59  ret i32 %masked
60}
61