| ; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py |
| ; RUN: opt -S -disable-output "-passes=print<scalar-evolution>" < %s 2>&1 | FileCheck %s |
| |
| ; The obvious case. |
| define i32 @div(i32 %val) nounwind { |
| ; CHECK-LABEL: 'div' |
| ; CHECK-NEXT: Classifying expressions for: @div |
| ; CHECK-NEXT: %tmp1 = udiv i32 %val, 16 |
| ; CHECK-NEXT: --> (%val /u 16) U: [0,268435456) S: [0,268435456) |
| ; CHECK-NEXT: %tmp2 = mul i32 %tmp1, 16 |
| ; CHECK-NEXT: --> (16 * (%val /u 16))<nuw> U: [0,-15) S: [-2147483648,2147483633) |
| ; CHECK-NEXT: Determining loop execution counts for: @div |
| ; |
| %tmp1 = udiv i32 %val, 16 |
| %tmp2 = mul i32 %tmp1, 16 |
| ret i32 %tmp2 |
| } |
| |
| define i32 @sdiv(i32 %val) nounwind { |
| ; CHECK-LABEL: 'sdiv' |
| ; CHECK-NEXT: Classifying expressions for: @sdiv |
| ; CHECK-NEXT: %tmp1 = sdiv i32 %val, 16 |
| ; CHECK-NEXT: --> %tmp1 U: [-134217728,134217728) S: [-134217728,134217728) |
| ; CHECK-NEXT: %tmp2 = mul i32 %tmp1, 16 |
| ; CHECK-NEXT: --> (16 * %tmp1)<nsw> U: [0,-15) S: [-2147483648,2147483633) |
| ; CHECK-NEXT: Determining loop execution counts for: @sdiv |
| ; |
| %tmp1 = sdiv i32 %val, 16 |
| %tmp2 = mul i32 %tmp1, 16 |
| ret i32 %tmp2 |
| } |
| |
| ; Or, it could be a number of equivalent patterns with mask: |
| ; b) x & (-1 << nbits) |
| ; d) x >> nbits << nbits |
| |
| define i32 @mask_b(i32 %val) nounwind { |
| ; CHECK-LABEL: 'mask_b' |
| ; CHECK-NEXT: Classifying expressions for: @mask_b |
| ; CHECK-NEXT: %masked = and i32 %val, -16 |
| ; CHECK-NEXT: --> (16 * (%val /u 16))<nuw> U: [0,-15) S: [-2147483648,2147483633) |
| ; CHECK-NEXT: Determining loop execution counts for: @mask_b |
| ; |
| %masked = and i32 %val, -16 |
| ret i32 %masked |
| } |
| |
| define i32 @mask_d(i32 %val) nounwind { |
| ; CHECK-LABEL: 'mask_d' |
| ; CHECK-NEXT: Classifying expressions for: @mask_d |
| ; CHECK-NEXT: %lowbitscleared = lshr i32 %val, 4 |
| ; CHECK-NEXT: --> (%val /u 16) U: [0,268435456) S: [0,268435456) |
| ; CHECK-NEXT: %masked = shl i32 %lowbitscleared, 4 |
| ; CHECK-NEXT: --> (16 * (%val /u 16))<nuw> U: [0,-15) S: [-2147483648,2147483633) |
| ; CHECK-NEXT: Determining loop execution counts for: @mask_d |
| ; |
| %lowbitscleared = lshr i32 %val, 4 |
| %masked = shl i32 %lowbitscleared, 4 |
| ret i32 %masked |
| } |