derek.holloway
7502bf64a4
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99 lines
2.7 KiB
LLVM
99 lines
2.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s --check-prefix=CHECK
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define i32 @fold_urem_positive_odd(i32 %x) {
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; CHECK-LABEL: fold_urem_positive_odd:
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; CHECK: # %bb.0:
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; CHECK-NEXT: movl %edi, %eax
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; CHECK-NEXT: movabsq $194176253438197760, %rcx # imm = 0x2B1DA4612000000
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; CHECK-NEXT: mulq %rcx
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; CHECK-NEXT: imull $95, %edx, %eax
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; CHECK-NEXT: subl %eax, %edi
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; CHECK-NEXT: movl %edi, %eax
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; CHECK-NEXT: retq
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%1 = urem i32 %x, 95
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ret i32 %1
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}
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define i32 @fold_urem_positive_even(i32 %x) {
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; CHECK-LABEL: fold_urem_positive_even:
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; CHECK: # %bb.0:
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; CHECK-NEXT: movl %edi, %eax
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; CHECK-NEXT: movl %edi, %ecx
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; CHECK-NEXT: movl $4149100483, %edx # imm = 0xF74E3FC3
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; CHECK-NEXT: imulq %rcx, %rdx
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; CHECK-NEXT: shrq $42, %rdx
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; CHECK-NEXT: imull $1060, %edx, %ecx # imm = 0x424
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; CHECK-NEXT: subl %ecx, %eax
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; CHECK-NEXT: retq
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%1 = urem i32 %x, 1060
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ret i32 %1
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}
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; Don't fold if we can combine urem with udiv.
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define i32 @combine_urem_udiv(i32 %x) {
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; CHECK-LABEL: combine_urem_udiv:
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; CHECK: # %bb.0:
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; CHECK-NEXT: # kill: def $edi killed $edi def $rdi
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; CHECK-NEXT: movl %edi, %eax
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; CHECK-NEXT: movabsq $194176253438197760, %rcx # imm = 0x2B1DA4612000000
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; CHECK-NEXT: mulq %rcx
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; CHECK-NEXT: imull $95, %edx, %eax
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; CHECK-NEXT: subl %eax, %edi
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; CHECK-NEXT: leal (%rdi,%rdx), %eax
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; CHECK-NEXT: retq
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%1 = urem i32 %x, 95
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%2 = udiv i32 %x, 95
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%3 = add i32 %1, %2
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ret i32 %3
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}
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; Don't fold for divisors that are a power of two.
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define i32 @dont_fold_urem_power_of_two(i32 %x) {
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; CHECK-LABEL: dont_fold_urem_power_of_two:
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; CHECK: # %bb.0:
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; CHECK-NEXT: movl %edi, %eax
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; CHECK-NEXT: andl $63, %eax
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; CHECK-NEXT: retq
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%1 = urem i32 %x, 64
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ret i32 %1
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}
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; Don't fold if the divisor is one.
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define i32 @dont_fold_urem_one(i32 %x) {
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; CHECK-LABEL: dont_fold_urem_one:
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; CHECK: # %bb.0:
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; CHECK-NEXT: xorl %eax, %eax
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; CHECK-NEXT: retq
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%1 = urem i32 %x, 1
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ret i32 %1
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}
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; Don't fold if the divisor is 2^32.
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define i32 @dont_fold_urem_i32_umax(i32 %x) {
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; CHECK-LABEL: dont_fold_urem_i32_umax:
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; CHECK: # %bb.0:
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; CHECK-NEXT: retq
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%1 = urem i32 %x, 4294967296
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ret i32 %1
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}
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; Don't fold i64 urem
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define i64 @dont_fold_urem_i64(i64 %x) {
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; CHECK-LABEL: dont_fold_urem_i64:
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; CHECK: # %bb.0:
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; CHECK-NEXT: movq %rdi, %rax
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; CHECK-NEXT: shrq %rax
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; CHECK-NEXT: movabsq $6023426636313322977, %rcx # imm = 0x5397829CBC14E5E1
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; CHECK-NEXT: mulq %rcx
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; CHECK-NEXT: shrq $4, %rdx
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; CHECK-NEXT: imulq $98, %rdx, %rax
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; CHECK-NEXT: subq %rax, %rdi
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; CHECK-NEXT: movq %rdi, %rax
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; CHECK-NEXT: retq
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%1 = urem i64 %x, 98
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ret i64 %1
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}
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