61 lines · plain
1; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py2; RUN: opt -S -disable-output "-passes=print<scalar-evolution>" < %s 2>&1 | FileCheck %s3 4; The obvious case.5define i32 @div(i32 %val) nounwind {6; CHECK-LABEL: 'div'7; CHECK-NEXT: Classifying expressions for: @div8; CHECK-NEXT: %tmp1 = udiv i32 %val, 169; CHECK-NEXT: --> (%val /u 16) U: [0,268435456) S: [0,268435456)10; CHECK-NEXT: %tmp2 = mul i32 %tmp1, 1611; CHECK-NEXT: --> (16 * (%val /u 16))<nuw> U: [0,-15) S: [-2147483648,2147483633)12; CHECK-NEXT: Determining loop execution counts for: @div13;14 %tmp1 = udiv i32 %val, 1615 %tmp2 = mul i32 %tmp1, 1616 ret i32 %tmp217}18 19define i32 @sdiv(i32 %val) nounwind {20; CHECK-LABEL: 'sdiv'21; CHECK-NEXT: Classifying expressions for: @sdiv22; CHECK-NEXT: %tmp1 = sdiv i32 %val, 1623; CHECK-NEXT: --> %tmp1 U: [-134217728,134217728) S: [-134217728,134217728)24; CHECK-NEXT: %tmp2 = mul i32 %tmp1, 1625; CHECK-NEXT: --> (16 * %tmp1)<nsw> U: [0,-15) S: [-2147483648,2147483633)26; CHECK-NEXT: Determining loop execution counts for: @sdiv27;28 %tmp1 = sdiv i32 %val, 1629 %tmp2 = mul i32 %tmp1, 1630 ret i32 %tmp231}32 33; Or, it could be a number of equivalent patterns with mask:34; b) x & (-1 << nbits)35; d) x >> nbits << nbits36 37define i32 @mask_b(i32 %val) nounwind {38; CHECK-LABEL: 'mask_b'39; CHECK-NEXT: Classifying expressions for: @mask_b40; CHECK-NEXT: %masked = and i32 %val, -1641; CHECK-NEXT: --> (16 * (%val /u 16))<nuw> U: [0,-15) S: [-2147483648,2147483633)42; CHECK-NEXT: Determining loop execution counts for: @mask_b43;44 %masked = and i32 %val, -1645 ret i32 %masked46}47 48define i32 @mask_d(i32 %val) nounwind {49; CHECK-LABEL: 'mask_d'50; CHECK-NEXT: Classifying expressions for: @mask_d51; CHECK-NEXT: %lowbitscleared = lshr i32 %val, 452; CHECK-NEXT: --> (%val /u 16) U: [0,268435456) S: [0,268435456)53; CHECK-NEXT: %masked = shl i32 %lowbitscleared, 454; CHECK-NEXT: --> (16 * (%val /u 16))<nuw> U: [0,-15) S: [-2147483648,2147483633)55; CHECK-NEXT: Determining loop execution counts for: @mask_d56;57 %lowbitscleared = lshr i32 %val, 458 %masked = shl i32 %lowbitscleared, 459 ret i32 %masked60}61