1; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py 2; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s --check-prefix=CHECK 3 4define i32 @fold_urem_positive_odd(i32 %x) { 5; CHECK-LABEL: fold_urem_positive_odd: 6; CHECK: # %bb.0: 7; CHECK-NEXT: movl %edi, %eax 8; CHECK-NEXT: movl %edi, %ecx 9; CHECK-NEXT: imulq $1491936009, %rcx, %rcx # imm = 0x58ED2309 10; CHECK-NEXT: shrq $32, %rcx 11; CHECK-NEXT: movl %edi, %edx 12; CHECK-NEXT: subl %ecx, %edx 13; CHECK-NEXT: shrl %edx 14; CHECK-NEXT: addl %ecx, %edx 15; CHECK-NEXT: shrl $6, %edx 16; CHECK-NEXT: imull $95, %edx, %ecx 17; CHECK-NEXT: subl %ecx, %eax 18; CHECK-NEXT: retq 19 %1 = urem i32 %x, 95 20 ret i32 %1 21} 22 23 24define i32 @fold_urem_positive_even(i32 %x) { 25; CHECK-LABEL: fold_urem_positive_even: 26; CHECK: # %bb.0: 27; CHECK-NEXT: movl %edi, %eax 28; CHECK-NEXT: movl %edi, %ecx 29; CHECK-NEXT: movl $4149100483, %edx # imm = 0xF74E3FC3 30; CHECK-NEXT: imulq %rcx, %rdx 31; CHECK-NEXT: shrq $42, %rdx 32; CHECK-NEXT: imull $1060, %edx, %ecx # imm = 0x424 33; CHECK-NEXT: subl %ecx, %eax 34; CHECK-NEXT: retq 35 %1 = urem i32 %x, 1060 36 ret i32 %1 37} 38 39 40; Don't fold if we can combine urem with udiv. 41define i32 @combine_urem_udiv(i32 %x) { 42; CHECK-LABEL: combine_urem_udiv: 43; CHECK: # %bb.0: 44; CHECK-NEXT: movl %edi, %eax 45; CHECK-NEXT: imulq $1491936009, %rax, %rcx # imm = 0x58ED2309 46; CHECK-NEXT: shrq $32, %rcx 47; CHECK-NEXT: movl %edi, %eax 48; CHECK-NEXT: subl %ecx, %eax 49; CHECK-NEXT: shrl %eax 50; CHECK-NEXT: addl %ecx, %eax 51; CHECK-NEXT: shrl $6, %eax 52; CHECK-NEXT: imull $95, %eax, %ecx 53; CHECK-NEXT: subl %ecx, %edi 54; CHECK-NEXT: addl %edi, %eax 55; CHECK-NEXT: retq 56 %1 = urem i32 %x, 95 57 %2 = udiv i32 %x, 95 58 %3 = add i32 %1, %2 59 ret i32 %3 60} 61 62; Don't fold for divisors that are a power of two. 63define i32 @dont_fold_urem_power_of_two(i32 %x) { 64; CHECK-LABEL: dont_fold_urem_power_of_two: 65; CHECK: # %bb.0: 66; CHECK-NEXT: movl %edi, %eax 67; CHECK-NEXT: andl $63, %eax 68; CHECK-NEXT: retq 69 %1 = urem i32 %x, 64 70 ret i32 %1 71} 72 73; Don't fold if the divisor is one. 74define i32 @dont_fold_urem_one(i32 %x) { 75; CHECK-LABEL: dont_fold_urem_one: 76; CHECK: # %bb.0: 77; CHECK-NEXT: xorl %eax, %eax 78; CHECK-NEXT: retq 79 %1 = urem i32 %x, 1 80 ret i32 %1 81} 82 83; Don't fold if the divisor is 2^32. 84define i32 @dont_fold_urem_i32_umax(i32 %x) { 85; CHECK-LABEL: dont_fold_urem_i32_umax: 86; CHECK: # %bb.0: 87; CHECK-NEXT: retq 88 %1 = urem i32 %x, 4294967296 89 ret i32 %1 90} 91 92; Don't fold i64 urem 93define i64 @dont_fold_urem_i64(i64 %x) { 94; CHECK-LABEL: dont_fold_urem_i64: 95; CHECK: # %bb.0: 96; CHECK-NEXT: movq %rdi, %rax 97; CHECK-NEXT: shrq %rax 98; CHECK-NEXT: movabsq $6023426636313322977, %rcx # imm = 0x5397829CBC14E5E1 99; CHECK-NEXT: mulq %rcx 100; CHECK-NEXT: shrq $4, %rdx 101; CHECK-NEXT: imulq $98, %rdx, %rax 102; CHECK-NEXT: subq %rax, %rdi 103; CHECK-NEXT: movq %rdi, %rax 104; CHECK-NEXT: retq 105 %1 = urem i64 %x, 98 106 ret i64 %1 107} 108