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 ; These testcases aren't *identical* but they have the same/similar meaning. 5 6 ; The obvious case. 7 define i32 @div(i32 %val, i32 %num) nounwind { 8 ; CHECK-LABEL: 'div' 9 ; CHECK-NEXT: Classifying expressions for: @div 10 ; CHECK-NEXT: %tmp1 = udiv i32 %val, %num 11 ; CHECK-NEXT: --> (%val /u %num) U: full-set S: full-set 12 ; CHECK-NEXT: %tmp2 = mul i32 %tmp1, %num 13 ; CHECK-NEXT: --> ((%val /u %num) * %num) U: full-set S: full-set 14 ; CHECK-NEXT: Determining loop execution counts for: @div 15 ; 16 %tmp1 = udiv i32 %val, %num 17 %tmp2 = mul i32 %tmp1, %num 18 ret i32 %tmp2 19 } 20 21 define i32 @sdiv(i32 %val, i32 %num) nounwind { 22 ; CHECK-LABEL: 'sdiv' 23 ; CHECK-NEXT: Classifying expressions for: @sdiv 24 ; CHECK-NEXT: %tmp1 = sdiv i32 %val, %num 25 ; CHECK-NEXT: --> %tmp1 U: full-set S: full-set 26 ; CHECK-NEXT: %tmp2 = mul i32 %tmp1, %num 27 ; CHECK-NEXT: --> (%num * %tmp1) U: full-set S: full-set 28 ; CHECK-NEXT: Determining loop execution counts for: @sdiv 29 ; 30 %tmp1 = sdiv i32 %val, %num 31 %tmp2 = mul i32 %tmp1, %num 32 ret i32 %tmp2 33 } 34 35 ; Or, it could be a number of equivalent patterns with mask: 36 ; b) x & (-1 << nbits) 37 ; d) x >> (32 - y) << (32 - y) 38 39 define i32 @mask_b(i32 %val, i32 %numlowbits) nounwind { 40 ; CHECK-LABEL: 'mask_b' 41 ; CHECK-NEXT: Classifying expressions for: @mask_b 42 ; CHECK-NEXT: %mask = shl i32 -1, %numlowbits 43 ; CHECK-NEXT: --> %mask U: full-set S: full-set 44 ; CHECK-NEXT: %masked = and i32 %mask, %val 45 ; CHECK-NEXT: --> %masked U: full-set S: full-set 46 ; CHECK-NEXT: Determining loop execution counts for: @mask_b 47 ; 48 %mask = shl i32 -1, %numlowbits 49 %masked = and i32 %mask, %val 50 ret i32 %masked 51 } 52 53 define i32 @mask_d(i32 %val, i32 %lowbits) nounwind { 54 ; CHECK-LABEL: 'mask_d' 55 ; CHECK-NEXT: Classifying expressions for: @mask_d 56 ; CHECK-NEXT: %numlowbits = sub i32 32, %lowbits 57 ; CHECK-NEXT: --> (32 + (-1 * %lowbits)) U: full-set S: full-set 58 ; CHECK-NEXT: %lowbitscleared = lshr i32 %val, %numlowbits 59 ; CHECK-NEXT: --> %lowbitscleared U: full-set S: full-set 60 ; CHECK-NEXT: %masked = shl i32 %lowbitscleared, %numlowbits 61 ; CHECK-NEXT: --> %masked U: full-set S: full-set 62 ; CHECK-NEXT: Determining loop execution counts for: @mask_d 63 ; 64 %numlowbits = sub i32 32, %lowbits 65 %lowbitscleared = lshr i32 %val, %numlowbits 66 %masked = shl i32 %lowbitscleared, %numlowbits 67 ret i32 %masked 68 } 69
