xref: /llvm-project/llvm/test/CodeGen/X86/srem-lkk.ll (revision 41c934acaf8539dedad4b48bbc88580c74fed25a) 
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_srem_positive_odd(i32 %x) {
5; CHECK-LABEL: fold_srem_positive_odd:
6; CHECK:       # %bb.0:
7; CHECK-NEXT:    movslq %edi, %rax
8; CHECK-NEXT:    imulq $-1401515643, %rax, %rcx # imm = 0xAC769185
9; CHECK-NEXT:    shrq $32, %rcx
10; CHECK-NEXT:    addl %eax, %ecx
11; CHECK-NEXT:    movl %ecx, %edx
12; CHECK-NEXT:    shrl $31, %edx
13; CHECK-NEXT:    sarl $6, %ecx
14; CHECK-NEXT:    addl %edx, %ecx
15; CHECK-NEXT:    imull $95, %ecx, %ecx
16; CHECK-NEXT:    subl %ecx, %eax
17; CHECK-NEXT:    # kill: def $eax killed $eax killed $rax
18; CHECK-NEXT:    retq
19  %1 = srem i32 %x, 95
20  ret i32 %1
21}
22
23
24define i32 @fold_srem_positive_even(i32 %x) {
25; CHECK-LABEL: fold_srem_positive_even:
26; CHECK:       # %bb.0:
27; CHECK-NEXT:    movslq %edi, %rax
28; CHECK-NEXT:    imulq $1037275121, %rax, %rcx # imm = 0x3DD38FF1
29; CHECK-NEXT:    movq %rcx, %rdx
30; CHECK-NEXT:    shrq $63, %rdx
31; CHECK-NEXT:    sarq $40, %rcx
32; CHECK-NEXT:    addl %edx, %ecx
33; CHECK-NEXT:    imull $1060, %ecx, %ecx # imm = 0x424
34; CHECK-NEXT:    subl %ecx, %eax
35; CHECK-NEXT:    # kill: def $eax killed $eax killed $rax
36; CHECK-NEXT:    retq
37  %1 = srem i32 %x, 1060
38  ret i32 %1
39}
40
41
42define i32 @fold_srem_negative_odd(i32 %x) {
43; CHECK-LABEL: fold_srem_negative_odd:
44; CHECK:       # %bb.0:
45; CHECK-NEXT:    movslq %edi, %rax
46; CHECK-NEXT:    imulq $-1520762971, %rax, %rcx # imm = 0xA55AFFA5
47; CHECK-NEXT:    movq %rcx, %rdx
48; CHECK-NEXT:    shrq $63, %rdx
49; CHECK-NEXT:    sarq $40, %rcx
50; CHECK-NEXT:    addl %edx, %ecx
51; CHECK-NEXT:    imull $-723, %ecx, %ecx # imm = 0xFD2D
52; CHECK-NEXT:    subl %ecx, %eax
53; CHECK-NEXT:    # kill: def $eax killed $eax killed $rax
54; CHECK-NEXT:    retq
55  %1 = srem i32 %x, -723
56  ret i32 %1
57}
58
59
60define i32 @fold_srem_negative_even(i32 %x) {
61; CHECK-LABEL: fold_srem_negative_even:
62; CHECK:       # %bb.0:
63; CHECK-NEXT:    movslq %edi, %rax
64; CHECK-NEXT:    imulq $-47844377, %rax, %rcx # imm = 0xFD25F3E7
65; CHECK-NEXT:    movq %rcx, %rdx
66; CHECK-NEXT:    shrq $63, %rdx
67; CHECK-NEXT:    sarq $40, %rcx
68; CHECK-NEXT:    addl %edx, %ecx
69; CHECK-NEXT:    imull $-22981, %ecx, %ecx # imm = 0xA63B
70; CHECK-NEXT:    subl %ecx, %eax
71; CHECK-NEXT:    # kill: def $eax killed $eax killed $rax
72; CHECK-NEXT:    retq
73  %1 = srem i32 %x, -22981
74  ret i32 %1
75}
76
77
78; Don't fold if we can combine srem with sdiv.
79define i32 @combine_srem_sdiv(i32 %x) {
80; CHECK-LABEL: combine_srem_sdiv:
81; CHECK:       # %bb.0:
82; CHECK-NEXT:    movslq %edi, %rax
83; CHECK-NEXT:    imulq $-1401515643, %rax, %rcx # imm = 0xAC769185
84; CHECK-NEXT:    shrq $32, %rcx
85; CHECK-NEXT:    addl %eax, %ecx
86; CHECK-NEXT:    movl %ecx, %edx
87; CHECK-NEXT:    shrl $31, %edx
88; CHECK-NEXT:    sarl $6, %ecx
89; CHECK-NEXT:    addl %edx, %ecx
90; CHECK-NEXT:    imull $95, %ecx, %edx
91; CHECK-NEXT:    subl %edx, %eax
92; CHECK-NEXT:    addl %ecx, %eax
93; CHECK-NEXT:    # kill: def $eax killed $eax killed $rax
94; CHECK-NEXT:    retq
95  %1 = srem i32 %x, 95
96  %2 = sdiv i32 %x, 95
97  %3 = add i32 %1, %2
98  ret i32 %3
99}
100
101; Don't fold for divisors that are a power of two.
102define i32 @dont_fold_srem_power_of_two(i32 %x) {
103; CHECK-LABEL: dont_fold_srem_power_of_two:
104; CHECK:       # %bb.0:
105; CHECK-NEXT:    movl %edi, %eax
106; CHECK-NEXT:    leal 63(%rax), %ecx
107; CHECK-NEXT:    testl %edi, %edi
108; CHECK-NEXT:    cmovnsl %edi, %ecx
109; CHECK-NEXT:    andl $-64, %ecx
110; CHECK-NEXT:    subl %ecx, %eax
111; CHECK-NEXT:    # kill: def $eax killed $eax killed $rax
112; CHECK-NEXT:    retq
113  %1 = srem i32 %x, 64
114  ret i32 %1
115}
116
117; Don't fold if the divisor is one.
118define i32 @dont_fold_srem_one(i32 %x) {
119; CHECK-LABEL: dont_fold_srem_one:
120; CHECK:       # %bb.0:
121; CHECK-NEXT:    xorl %eax, %eax
122; CHECK-NEXT:    retq
123  %1 = srem i32 %x, 1
124  ret i32 %1
125}
126
127; Don't fold if the divisor is 2^31.
128define i32 @dont_fold_srem_i32_smax(i32 %x) {
129; CHECK-LABEL: dont_fold_srem_i32_smax:
130; CHECK:       # %bb.0:
131; CHECK-NEXT:    # kill: def $edi killed $edi def $rdi
132; CHECK-NEXT:    leal 2147483647(%rdi), %eax
133; CHECK-NEXT:    testl %edi, %edi
134; CHECK-NEXT:    cmovnsl %edi, %eax
135; CHECK-NEXT:    andl $-2147483648, %eax # imm = 0x80000000
136; CHECK-NEXT:    addl %edi, %eax
137; CHECK-NEXT:    retq
138  %1 = srem i32 %x, 2147483648
139  ret i32 %1
140}
141
142; Don't fold i64 srem
143define i64 @dont_fold_srem_i64(i64 %x) {
144; CHECK-LABEL: dont_fold_srem_i64:
145; CHECK:       # %bb.0:
146; CHECK-NEXT:    movabsq $6023426636313322977, %rcx # imm = 0x5397829CBC14E5E1
147; CHECK-NEXT:    movq %rdi, %rax
148; CHECK-NEXT:    imulq %rcx
149; CHECK-NEXT:    movq %rdx, %rax
150; CHECK-NEXT:    shrq $63, %rax
151; CHECK-NEXT:    sarq $5, %rdx
152; CHECK-NEXT:    addq %rax, %rdx
153; CHECK-NEXT:    imulq $98, %rdx, %rax
154; CHECK-NEXT:    subq %rax, %rdi
155; CHECK-NEXT:    movq %rdi, %rax
156; CHECK-NEXT:    retq
157  %1 = srem i64 %x, 98
158  ret i64 %1
159}
160