| ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py |
| ; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s --check-prefix=CHECK |
| |
| define i32 @fold_urem_positive_odd(i32 %x) { |
| ; CHECK-LABEL: fold_urem_positive_odd: |
| ; CHECK: # %bb.0: |
| ; CHECK-NEXT: movl %edi, %eax |
| ; CHECK-NEXT: movl %edi, %ecx |
| ; CHECK-NEXT: imulq $1491936009, %rcx, %rcx # imm = 0x58ED2309 |
| ; CHECK-NEXT: shrq $32, %rcx |
| ; CHECK-NEXT: movl %edi, %edx |
| ; CHECK-NEXT: subl %ecx, %edx |
| ; CHECK-NEXT: shrl %edx |
| ; CHECK-NEXT: addl %ecx, %edx |
| ; CHECK-NEXT: shrl $6, %edx |
| ; CHECK-NEXT: imull $95, %edx, %ecx |
| ; CHECK-NEXT: subl %ecx, %eax |
| ; CHECK-NEXT: retq |
| %1 = urem i32 %x, 95 |
| ret i32 %1 |
| } |
| |
| |
| define i32 @fold_urem_positive_even(i32 %x) { |
| ; CHECK-LABEL: fold_urem_positive_even: |
| ; CHECK: # %bb.0: |
| ; CHECK-NEXT: movl %edi, %eax |
| ; CHECK-NEXT: movl %edi, %ecx |
| ; CHECK-NEXT: movl $4149100483, %edx # imm = 0xF74E3FC3 |
| ; CHECK-NEXT: imulq %rcx, %rdx |
| ; CHECK-NEXT: shrq $42, %rdx |
| ; CHECK-NEXT: imull $1060, %edx, %ecx # imm = 0x424 |
| ; CHECK-NEXT: subl %ecx, %eax |
| ; CHECK-NEXT: retq |
| %1 = urem i32 %x, 1060 |
| ret i32 %1 |
| } |
| |
| |
| ; Don't fold if we can combine urem with udiv. |
| define i32 @combine_urem_udiv(i32 %x) { |
| ; CHECK-LABEL: combine_urem_udiv: |
| ; CHECK: # %bb.0: |
| ; CHECK-NEXT: movl %edi, %eax |
| ; CHECK-NEXT: imulq $1491936009, %rax, %rcx # imm = 0x58ED2309 |
| ; CHECK-NEXT: shrq $32, %rcx |
| ; CHECK-NEXT: movl %edi, %eax |
| ; CHECK-NEXT: subl %ecx, %eax |
| ; CHECK-NEXT: shrl %eax |
| ; CHECK-NEXT: addl %ecx, %eax |
| ; CHECK-NEXT: shrl $6, %eax |
| ; CHECK-NEXT: imull $95, %eax, %ecx |
| ; CHECK-NEXT: subl %ecx, %edi |
| ; CHECK-NEXT: addl %edi, %eax |
| ; CHECK-NEXT: retq |
| %1 = urem i32 %x, 95 |
| %2 = udiv i32 %x, 95 |
| %3 = add i32 %1, %2 |
| ret i32 %3 |
| } |
| |
| ; Don't fold for divisors that are a power of two. |
| define i32 @dont_fold_urem_power_of_two(i32 %x) { |
| ; CHECK-LABEL: dont_fold_urem_power_of_two: |
| ; CHECK: # %bb.0: |
| ; CHECK-NEXT: movl %edi, %eax |
| ; CHECK-NEXT: andl $63, %eax |
| ; CHECK-NEXT: retq |
| %1 = urem i32 %x, 64 |
| ret i32 %1 |
| } |
| |
| ; Don't fold if the divisor is one. |
| define i32 @dont_fold_urem_one(i32 %x) { |
| ; CHECK-LABEL: dont_fold_urem_one: |
| ; CHECK: # %bb.0: |
| ; CHECK-NEXT: xorl %eax, %eax |
| ; CHECK-NEXT: retq |
| %1 = urem i32 %x, 1 |
| ret i32 %1 |
| } |
| |
| ; Don't fold if the divisor is 2^32. |
| define i32 @dont_fold_urem_i32_umax(i32 %x) { |
| ; CHECK-LABEL: dont_fold_urem_i32_umax: |
| ; CHECK: # %bb.0: |
| ; CHECK-NEXT: retq |
| %1 = urem i32 %x, 4294967296 |
| ret i32 %1 |
| } |
| |
| ; Don't fold i64 urem |
| define i64 @dont_fold_urem_i64(i64 %x) { |
| ; CHECK-LABEL: dont_fold_urem_i64: |
| ; CHECK: # %bb.0: |
| ; CHECK-NEXT: movq %rdi, %rax |
| ; CHECK-NEXT: shrq %rax |
| ; CHECK-NEXT: movabsq $6023426636313322977, %rcx # imm = 0x5397829CBC14E5E1 |
| ; CHECK-NEXT: mulq %rcx |
| ; CHECK-NEXT: shrq $4, %rdx |
| ; CHECK-NEXT: imulq $98, %rdx, %rax |
| ; CHECK-NEXT: subq %rax, %rdi |
| ; CHECK-NEXT: movq %rdi, %rax |
| ; CHECK-NEXT: retq |
| %1 = urem i64 %x, 98 |
| ret i64 %1 |
| } |