1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2 ; RUN: opt < %s -div-rem-pairs -S -mtriple=mips-unknown-unknown | FileCheck %s
4 declare void @foo(i32, i32)
6 define void @decompose_illegal_srem_same_block(i32 %a, i32 %b) {
7 ; CHECK-LABEL: @decompose_illegal_srem_same_block(
8 ; CHECK-NEXT: [[A_FROZEN:%.*]] = freeze i32 [[A:%.*]]
9 ; CHECK-NEXT: [[B_FROZEN:%.*]] = freeze i32 [[B:%.*]]
10 ; CHECK-NEXT: [[DIV:%.*]] = sdiv i32 [[A_FROZEN]], [[B_FROZEN]]
11 ; CHECK-NEXT: [[TMP1:%.*]] = mul i32 [[DIV]], [[B_FROZEN]]
12 ; CHECK-NEXT: [[REM_DECOMPOSED:%.*]] = sub i32 [[A_FROZEN]], [[TMP1]]
13 ; CHECK-NEXT: call void @foo(i32 [[REM_DECOMPOSED]], i32 [[DIV]])
14 ; CHECK-NEXT: ret void
16 %rem = srem i32 %a, %b
17 %div = sdiv i32 %a, %b
18 call void @foo(i32 %rem, i32 %div)
22 define void @decompose_illegal_urem_same_block(i32 %a, i32 %b) {
23 ; CHECK-LABEL: @decompose_illegal_urem_same_block(
24 ; CHECK-NEXT: [[A_FROZEN:%.*]] = freeze i32 [[A:%.*]]
25 ; CHECK-NEXT: [[B_FROZEN:%.*]] = freeze i32 [[B:%.*]]
26 ; CHECK-NEXT: [[DIV:%.*]] = udiv i32 [[A_FROZEN]], [[B_FROZEN]]
27 ; CHECK-NEXT: [[TMP1:%.*]] = mul i32 [[DIV]], [[B_FROZEN]]
28 ; CHECK-NEXT: [[REM_DECOMPOSED:%.*]] = sub i32 [[A_FROZEN]], [[TMP1]]
29 ; CHECK-NEXT: call void @foo(i32 [[REM_DECOMPOSED]], i32 [[DIV]])
30 ; CHECK-NEXT: ret void
32 %div = udiv i32 %a, %b
33 %rem = urem i32 %a, %b
34 call void @foo(i32 %rem, i32 %div)
38 ; Hoist and optionally decompose the sdiv because it's safe and free.
39 ; PR31028 - https://bugs.llvm.org/show_bug.cgi?id=31028
41 define i32 @hoist_sdiv(i32 %a, i32 %b) {
42 ; CHECK-LABEL: @hoist_sdiv(
44 ; CHECK-NEXT: [[A_FROZEN:%.*]] = freeze i32 [[A:%.*]]
45 ; CHECK-NEXT: [[B_FROZEN:%.*]] = freeze i32 [[B:%.*]]
46 ; CHECK-NEXT: [[DIV:%.*]] = sdiv i32 [[A_FROZEN]], [[B_FROZEN]]
47 ; CHECK-NEXT: [[TMP0:%.*]] = mul i32 [[DIV]], [[B_FROZEN]]
48 ; CHECK-NEXT: [[REM_DECOMPOSED:%.*]] = sub i32 [[A_FROZEN]], [[TMP0]]
49 ; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[REM_DECOMPOSED]], 42
50 ; CHECK-NEXT: br i1 [[CMP]], label [[IF:%.*]], label [[END:%.*]]
52 ; CHECK-NEXT: br label [[END]]
54 ; CHECK-NEXT: [[RET:%.*]] = phi i32 [ [[DIV]], [[IF]] ], [ 3, [[ENTRY:%.*]] ]
55 ; CHECK-NEXT: ret i32 [[RET]]
58 %rem = srem i32 %a, %b
59 %cmp = icmp eq i32 %rem, 42
60 br i1 %cmp, label %if, label %end
63 %div = sdiv i32 %a, %b
67 %ret = phi i32 [ %div, %if ], [ 3, %entry ]
71 ; Hoist and optionally decompose the udiv because it's safe and free.
73 define i64 @hoist_udiv(i64 %a, i64 %b) {
74 ; CHECK-LABEL: @hoist_udiv(
76 ; CHECK-NEXT: [[A_FROZEN:%.*]] = freeze i64 [[A:%.*]]
77 ; CHECK-NEXT: [[B_FROZEN:%.*]] = freeze i64 [[B:%.*]]
78 ; CHECK-NEXT: [[DIV:%.*]] = udiv i64 [[A_FROZEN]], [[B_FROZEN]]
79 ; CHECK-NEXT: [[TMP0:%.*]] = mul i64 [[DIV]], [[B_FROZEN]]
80 ; CHECK-NEXT: [[REM_DECOMPOSED:%.*]] = sub i64 [[A_FROZEN]], [[TMP0]]
81 ; CHECK-NEXT: [[CMP:%.*]] = icmp eq i64 [[REM_DECOMPOSED]], 42
82 ; CHECK-NEXT: br i1 [[CMP]], label [[IF:%.*]], label [[END:%.*]]
84 ; CHECK-NEXT: br label [[END]]
86 ; CHECK-NEXT: [[RET:%.*]] = phi i64 [ [[DIV]], [[IF]] ], [ 3, [[ENTRY:%.*]] ]
87 ; CHECK-NEXT: ret i64 [[RET]]
90 %rem = urem i64 %a, %b
91 %cmp = icmp eq i64 %rem, 42
92 br i1 %cmp, label %if, label %end
95 %div = udiv i64 %a, %b
99 %ret = phi i64 [ %div, %if ], [ 3, %entry ]
103 ; Hoist the srem if it's safe and free, otherwise decompose it.
105 define i16 @hoist_srem(i16 %a, i16 %b) {
106 ; CHECK-LABEL: @hoist_srem(
108 ; CHECK-NEXT: [[A_FROZEN:%.*]] = freeze i16 [[A:%.*]]
109 ; CHECK-NEXT: [[B_FROZEN:%.*]] = freeze i16 [[B:%.*]]
110 ; CHECK-NEXT: [[DIV:%.*]] = sdiv i16 [[A_FROZEN]], [[B_FROZEN]]
111 ; CHECK-NEXT: [[CMP:%.*]] = icmp eq i16 [[DIV]], 42
112 ; CHECK-NEXT: br i1 [[CMP]], label [[IF:%.*]], label [[END:%.*]]
114 ; CHECK-NEXT: [[TMP0:%.*]] = mul i16 [[DIV]], [[B_FROZEN]]
115 ; CHECK-NEXT: [[REM_DECOMPOSED:%.*]] = sub i16 [[A_FROZEN]], [[TMP0]]
116 ; CHECK-NEXT: br label [[END]]
118 ; CHECK-NEXT: [[RET:%.*]] = phi i16 [ [[REM_DECOMPOSED]], [[IF]] ], [ 3, [[ENTRY:%.*]] ]
119 ; CHECK-NEXT: ret i16 [[RET]]
122 %div = sdiv i16 %a, %b
123 %cmp = icmp eq i16 %div, 42
124 br i1 %cmp, label %if, label %end
127 %rem = srem i16 %a, %b
131 %ret = phi i16 [ %rem, %if ], [ 3, %entry ]
135 ; Hoist the urem if it's safe and free, otherwise decompose it.
137 define i8 @hoist_urem(i8 %a, i8 %b) {
138 ; CHECK-LABEL: @hoist_urem(
140 ; CHECK-NEXT: [[A_FROZEN:%.*]] = freeze i8 [[A:%.*]]
141 ; CHECK-NEXT: [[B_FROZEN:%.*]] = freeze i8 [[B:%.*]]
142 ; CHECK-NEXT: [[DIV:%.*]] = udiv i8 [[A_FROZEN]], [[B_FROZEN]]
143 ; CHECK-NEXT: [[CMP:%.*]] = icmp eq i8 [[DIV]], 42
144 ; CHECK-NEXT: br i1 [[CMP]], label [[IF:%.*]], label [[END:%.*]]
146 ; CHECK-NEXT: [[TMP0:%.*]] = mul i8 [[DIV]], [[B_FROZEN]]
147 ; CHECK-NEXT: [[REM_DECOMPOSED:%.*]] = sub i8 [[A_FROZEN]], [[TMP0]]
148 ; CHECK-NEXT: br label [[END]]
150 ; CHECK-NEXT: [[RET:%.*]] = phi i8 [ [[REM_DECOMPOSED]], [[IF]] ], [ 3, [[ENTRY:%.*]] ]
151 ; CHECK-NEXT: ret i8 [[RET]]
154 %div = udiv i8 %a, %b
155 %cmp = icmp eq i8 %div, 42
156 br i1 %cmp, label %if, label %end
159 %rem = urem i8 %a, %b
163 %ret = phi i8 [ %rem, %if ], [ 3, %entry ]
167 ; Be careful with RAUW/invalidation if this is a srem-of-srem.
169 define i32 @srem_of_srem_unexpanded(i32 %X, i32 %Y, i32 %Z) {
170 ; CHECK-LABEL: @srem_of_srem_unexpanded(
171 ; CHECK-NEXT: [[T0:%.*]] = mul nsw i32 [[Z:%.*]], [[Y:%.*]]
172 ; CHECK-NEXT: [[X_FROZEN:%.*]] = freeze i32 [[X:%.*]]
173 ; CHECK-NEXT: [[T0_FROZEN:%.*]] = freeze i32 [[T0]]
174 ; CHECK-NEXT: [[T1:%.*]] = sdiv i32 [[X_FROZEN]], [[T0_FROZEN]]
175 ; CHECK-NEXT: [[T2:%.*]] = mul nsw i32 [[T0]], [[T1]]
176 ; CHECK-NEXT: [[TMP1:%.*]] = mul i32 [[T1]], [[T0_FROZEN]]
177 ; CHECK-NEXT: [[T3_DECOMPOSED:%.*]] = sub i32 [[X_FROZEN]], [[TMP1]]
178 ; CHECK-NEXT: [[Y_FROZEN:%.*]] = freeze i32 [[Y]]
179 ; CHECK-NEXT: [[T4:%.*]] = sdiv i32 [[T3_DECOMPOSED]], [[Y_FROZEN]]
180 ; CHECK-NEXT: [[T5:%.*]] = mul nsw i32 [[T4]], [[Y]]
181 ; CHECK-NEXT: [[TMP2:%.*]] = mul i32 [[T4]], [[Y_FROZEN]]
182 ; CHECK-NEXT: [[T6_DECOMPOSED:%.*]] = sub i32 [[T3_DECOMPOSED]], [[TMP2]]
183 ; CHECK-NEXT: ret i32 [[T6_DECOMPOSED]]
185 %t0 = mul nsw i32 %Z, %Y
186 %t1 = sdiv i32 %X, %t0
187 %t2 = mul nsw i32 %t0, %t1
188 %t3 = srem i32 %X, %t0
189 %t4 = sdiv i32 %t3, %Y
190 %t5 = mul nsw i32 %t4, %Y
191 %t6 = srem i32 %t3, %Y
194 define i32 @srem_of_srem_expanded(i32 %X, i32 %Y, i32 %Z) {
195 ; CHECK-LABEL: @srem_of_srem_expanded(
196 ; CHECK-NEXT: [[T0:%.*]] = mul nsw i32 [[Z:%.*]], [[Y:%.*]]
197 ; CHECK-NEXT: [[T1:%.*]] = sdiv i32 [[X:%.*]], [[T0]]
198 ; CHECK-NEXT: [[T2:%.*]] = mul nsw i32 [[T0]], [[T1]]
199 ; CHECK-NEXT: [[T3:%.*]] = sub nsw i32 [[X]], [[T2]]
200 ; CHECK-NEXT: [[T4:%.*]] = sdiv i32 [[T3]], [[Y]]
201 ; CHECK-NEXT: [[T5:%.*]] = mul nsw i32 [[T4]], [[Y]]
202 ; CHECK-NEXT: [[T6:%.*]] = sub nsw i32 [[T3]], [[T5]]
203 ; CHECK-NEXT: ret i32 [[T6]]
205 %t0 = mul nsw i32 %Z, %Y
206 %t1 = sdiv i32 %X, %t0
207 %t2 = mul nsw i32 %t0, %t1
208 %t3 = sub nsw i32 %X, %t2
209 %t4 = sdiv i32 %t3, %Y
210 %t5 = mul nsw i32 %t4, %Y
211 %t6 = sub nsw i32 %t3, %t5
215 ; If the ops don't match, don't do anything: signedness.
217 define i32 @dont_hoist_udiv(i32 %a, i32 %b) {
218 ; CHECK-LABEL: @dont_hoist_udiv(
220 ; CHECK-NEXT: [[REM:%.*]] = srem i32 [[A:%.*]], [[B:%.*]]
221 ; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[REM]], 42
222 ; CHECK-NEXT: br i1 [[CMP]], label [[IF:%.*]], label [[END:%.*]]
224 ; CHECK-NEXT: [[DIV:%.*]] = udiv i32 [[A]], [[B]]
225 ; CHECK-NEXT: br label [[END]]
227 ; CHECK-NEXT: [[RET:%.*]] = phi i32 [ [[DIV]], [[IF]] ], [ 3, [[ENTRY:%.*]] ]
228 ; CHECK-NEXT: ret i32 [[RET]]
231 %rem = srem i32 %a, %b
232 %cmp = icmp eq i32 %rem, 42
233 br i1 %cmp, label %if, label %end
236 %div = udiv i32 %a, %b
240 %ret = phi i32 [ %div, %if ], [ 3, %entry ]
244 ; If the ops don't match, don't do anything: operation.
246 define i32 @dont_hoist_srem(i32 %a, i32 %b) {
247 ; CHECK-LABEL: @dont_hoist_srem(
249 ; CHECK-NEXT: [[REM:%.*]] = urem i32 [[A:%.*]], [[B:%.*]]
250 ; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[REM]], 42
251 ; CHECK-NEXT: br i1 [[CMP]], label [[IF:%.*]], label [[END:%.*]]
253 ; CHECK-NEXT: [[REM2:%.*]] = srem i32 [[A]], [[B]]
254 ; CHECK-NEXT: br label [[END]]
256 ; CHECK-NEXT: [[RET:%.*]] = phi i32 [ [[REM2]], [[IF]] ], [ 3, [[ENTRY:%.*]] ]
257 ; CHECK-NEXT: ret i32 [[RET]]
260 %rem = urem i32 %a, %b
261 %cmp = icmp eq i32 %rem, 42
262 br i1 %cmp, label %if, label %end
265 %rem2 = srem i32 %a, %b
269 %ret = phi i32 [ %rem2, %if ], [ 3, %entry ]
273 ; If the ops don't match, don't do anything: operands.
275 define i32 @dont_hoist_sdiv(i32 %a, i32 %b, i32 %c) {
276 ; CHECK-LABEL: @dont_hoist_sdiv(
278 ; CHECK-NEXT: [[REM:%.*]] = srem i32 [[A:%.*]], [[B:%.*]]
279 ; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[REM]], 42
280 ; CHECK-NEXT: br i1 [[CMP]], label [[IF:%.*]], label [[END:%.*]]
282 ; CHECK-NEXT: [[DIV:%.*]] = sdiv i32 [[A]], [[C:%.*]]
283 ; CHECK-NEXT: br label [[END]]
285 ; CHECK-NEXT: [[RET:%.*]] = phi i32 [ [[DIV]], [[IF]] ], [ 3, [[ENTRY:%.*]] ]
286 ; CHECK-NEXT: ret i32 [[RET]]
289 %rem = srem i32 %a, %b
290 %cmp = icmp eq i32 %rem, 42
291 br i1 %cmp, label %if, label %end
294 %div = sdiv i32 %a, %c
298 %ret = phi i32 [ %div, %if ], [ 3, %entry ]
302 ; If the target doesn't have a unified div/rem op for the type, decompose rem in-place to mul+sub.
304 define i128 @dont_hoist_urem(i128 %a, i128 %b) {
305 ; CHECK-LABEL: @dont_hoist_urem(
307 ; CHECK-NEXT: [[A_FROZEN:%.*]] = freeze i128 [[A:%.*]]
308 ; CHECK-NEXT: [[B_FROZEN:%.*]] = freeze i128 [[B:%.*]]
309 ; CHECK-NEXT: [[DIV:%.*]] = udiv i128 [[A_FROZEN]], [[B_FROZEN]]
310 ; CHECK-NEXT: [[CMP:%.*]] = icmp eq i128 [[DIV]], 42
311 ; CHECK-NEXT: br i1 [[CMP]], label [[IF:%.*]], label [[END:%.*]]
313 ; CHECK-NEXT: [[TMP0:%.*]] = mul i128 [[DIV]], [[B_FROZEN]]
314 ; CHECK-NEXT: [[REM_DECOMPOSED:%.*]] = sub i128 [[A_FROZEN]], [[TMP0]]
315 ; CHECK-NEXT: br label [[END]]
317 ; CHECK-NEXT: [[RET:%.*]] = phi i128 [ [[REM_DECOMPOSED]], [[IF]] ], [ 3, [[ENTRY:%.*]] ]
318 ; CHECK-NEXT: ret i128 [[RET]]
321 %div = udiv i128 %a, %b
322 %cmp = icmp eq i128 %div, 42
323 br i1 %cmp, label %if, label %end
326 %rem = urem i128 %a, %b
330 %ret = phi i128 [ %rem, %if ], [ 3, %entry ]
334 ; We don't hoist if one op does not dominate the other,
335 ; but we could hoist both ops to the common predecessor block?
337 define i32 @no_domination(i1 %cmp, i32 %a, i32 %b) {
338 ; CHECK-LABEL: @no_domination(
340 ; CHECK-NEXT: br i1 [[CMP:%.*]], label [[IF:%.*]], label [[ELSE:%.*]]
342 ; CHECK-NEXT: [[DIV:%.*]] = sdiv i32 [[A:%.*]], [[B:%.*]]
343 ; CHECK-NEXT: br label [[END:%.*]]
345 ; CHECK-NEXT: [[REM:%.*]] = srem i32 [[A]], [[B]]
346 ; CHECK-NEXT: br label [[END]]
348 ; CHECK-NEXT: [[RET:%.*]] = phi i32 [ [[DIV]], [[IF]] ], [ [[REM]], [[ELSE]] ]
349 ; CHECK-NEXT: ret i32 [[RET]]
352 br i1 %cmp, label %if, label %else
355 %div = sdiv i32 %a, %b
359 %rem = srem i32 %a, %b
363 %ret = phi i32 [ %div, %if ], [ %rem, %else ]