1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2 ; RUN: opt < %s -passes=instcombine -S | FileCheck %s
3 ; RUN: opt < %s -passes=instcombine -use-constant-int-for-fixed-length-splat -S | FileCheck %s
5 target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
7 ; Canonicalize rotate by constant to funnel shift intrinsics.
8 ; This should help cost modeling for vectorization, inlining, etc.
9 ; If a target does not have a rotate instruction, the expansion will
10 ; be exactly these same 3 basic ops (shl/lshr/or).
12 define i32 @rotl_i32_constant(i32 %x) {
13 ; CHECK-LABEL: @rotl_i32_constant(
14 ; CHECK-NEXT: [[R:%.*]] = call i32 @llvm.fshl.i32(i32 [[X:%.*]], i32 [[X]], i32 11)
15 ; CHECK-NEXT: ret i32 [[R]]
18 %shr = lshr i32 %x, 21
19 %r = or i32 %shr, %shl
23 define i42 @rotr_i42_constant(i42 %x) {
24 ; CHECK-LABEL: @rotr_i42_constant(
25 ; CHECK-NEXT: [[R:%.*]] = call i42 @llvm.fshl.i42(i42 [[X:%.*]], i42 [[X]], i42 31)
26 ; CHECK-NEXT: ret i42 [[R]]
29 %shr = lshr i42 %x, 11
30 %r = or i42 %shr, %shl
34 define i8 @rotr_i8_constant_commute(i8 %x) {
35 ; CHECK-LABEL: @rotr_i8_constant_commute(
36 ; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.fshl.i8(i8 [[X:%.*]], i8 [[X]], i8 5)
37 ; CHECK-NEXT: ret i8 [[R]]
45 define i88 @rotl_i88_constant_commute(i88 %x) {
46 ; CHECK-LABEL: @rotl_i88_constant_commute(
47 ; CHECK-NEXT: [[R:%.*]] = call i88 @llvm.fshl.i88(i88 [[X:%.*]], i88 [[X]], i88 44)
48 ; CHECK-NEXT: ret i88 [[R]]
51 %shr = lshr i88 %x, 44
52 %r = or i88 %shl, %shr
56 ; Vector types are allowed.
58 define <2 x i16> @rotl_v2i16_constant_splat(<2 x i16> %x) {
59 ; CHECK-LABEL: @rotl_v2i16_constant_splat(
60 ; CHECK-NEXT: [[R:%.*]] = call <2 x i16> @llvm.fshl.v2i16(<2 x i16> [[X:%.*]], <2 x i16> [[X]], <2 x i16> splat (i16 1))
61 ; CHECK-NEXT: ret <2 x i16> [[R]]
63 %shl = shl <2 x i16> %x, <i16 1, i16 1>
64 %shr = lshr <2 x i16> %x, <i16 15, i16 15>
65 %r = or <2 x i16> %shl, %shr
69 define <2 x i16> @rotl_v2i16_constant_splat_poison0(<2 x i16> %x) {
70 ; CHECK-LABEL: @rotl_v2i16_constant_splat_poison0(
71 ; CHECK-NEXT: [[R:%.*]] = call <2 x i16> @llvm.fshl.v2i16(<2 x i16> [[X:%.*]], <2 x i16> [[X]], <2 x i16> splat (i16 1))
72 ; CHECK-NEXT: ret <2 x i16> [[R]]
74 %shl = shl <2 x i16> %x, <i16 poison, i16 1>
75 %shr = lshr <2 x i16> %x, <i16 15, i16 15>
76 %r = or <2 x i16> %shl, %shr
80 define <2 x i16> @rotl_v2i16_constant_splat_poison1(<2 x i16> %x) {
81 ; CHECK-LABEL: @rotl_v2i16_constant_splat_poison1(
82 ; CHECK-NEXT: [[R:%.*]] = call <2 x i16> @llvm.fshl.v2i16(<2 x i16> [[X:%.*]], <2 x i16> [[X]], <2 x i16> splat (i16 1))
83 ; CHECK-NEXT: ret <2 x i16> [[R]]
85 %shl = shl <2 x i16> %x, <i16 1, i16 1>
86 %shr = lshr <2 x i16> %x, <i16 15, i16 poison>
87 %r = or <2 x i16> %shl, %shr
91 ; Non-power-of-2 vector types are allowed.
93 define <2 x i17> @rotr_v2i17_constant_splat(<2 x i17> %x) {
94 ; CHECK-LABEL: @rotr_v2i17_constant_splat(
95 ; CHECK-NEXT: [[R:%.*]] = call <2 x i17> @llvm.fshl.v2i17(<2 x i17> [[X:%.*]], <2 x i17> [[X]], <2 x i17> splat (i17 12))
96 ; CHECK-NEXT: ret <2 x i17> [[R]]
98 %shl = shl <2 x i17> %x, <i17 12, i17 12>
99 %shr = lshr <2 x i17> %x, <i17 5, i17 5>
100 %r = or <2 x i17> %shr, %shl
104 define <2 x i17> @rotr_v2i17_constant_splat_poison0(<2 x i17> %x) {
105 ; CHECK-LABEL: @rotr_v2i17_constant_splat_poison0(
106 ; CHECK-NEXT: [[R:%.*]] = call <2 x i17> @llvm.fshl.v2i17(<2 x i17> [[X:%.*]], <2 x i17> [[X]], <2 x i17> splat (i17 12))
107 ; CHECK-NEXT: ret <2 x i17> [[R]]
109 %shl = shl <2 x i17> %x, <i17 12, i17 poison>
110 %shr = lshr <2 x i17> %x, <i17 poison, i17 5>
111 %r = or <2 x i17> %shr, %shl
115 define <2 x i17> @rotr_v2i17_constant_splat_poison1(<2 x i17> %x) {
116 ; CHECK-LABEL: @rotr_v2i17_constant_splat_poison1(
117 ; CHECK-NEXT: [[R:%.*]] = call <2 x i17> @llvm.fshl.v2i17(<2 x i17> [[X:%.*]], <2 x i17> [[X]], <2 x i17> splat (i17 12))
118 ; CHECK-NEXT: ret <2 x i17> [[R]]
120 %shl = shl <2 x i17> %x, <i17 12, i17 poison>
121 %shr = lshr <2 x i17> %x, <i17 5, i17 poison>
122 %r = or <2 x i17> %shr, %shl
126 ; Allow arbitrary shift constants.
127 ; Support poison elements.
129 define <2 x i32> @rotr_v2i32_constant_nonsplat(<2 x i32> %x) {
130 ; CHECK-LABEL: @rotr_v2i32_constant_nonsplat(
131 ; CHECK-NEXT: [[R:%.*]] = call <2 x i32> @llvm.fshl.v2i32(<2 x i32> [[X:%.*]], <2 x i32> [[X]], <2 x i32> <i32 17, i32 19>)
132 ; CHECK-NEXT: ret <2 x i32> [[R]]
134 %shl = shl <2 x i32> %x, <i32 17, i32 19>
135 %shr = lshr <2 x i32> %x, <i32 15, i32 13>
136 %r = or <2 x i32> %shl, %shr
140 define <2 x i32> @rotr_v2i32_constant_nonsplat_poison0(<2 x i32> %x) {
141 ; CHECK-LABEL: @rotr_v2i32_constant_nonsplat_poison0(
142 ; CHECK-NEXT: [[R:%.*]] = call <2 x i32> @llvm.fshl.v2i32(<2 x i32> [[X:%.*]], <2 x i32> [[X]], <2 x i32> <i32 poison, i32 19>)
143 ; CHECK-NEXT: ret <2 x i32> [[R]]
145 %shl = shl <2 x i32> %x, <i32 poison, i32 19>
146 %shr = lshr <2 x i32> %x, <i32 15, i32 13>
147 %r = or <2 x i32> %shl, %shr
151 define <2 x i32> @rotr_v2i32_constant_nonsplat_poison1(<2 x i32> %x) {
152 ; CHECK-LABEL: @rotr_v2i32_constant_nonsplat_poison1(
153 ; CHECK-NEXT: [[R:%.*]] = call <2 x i32> @llvm.fshl.v2i32(<2 x i32> [[X:%.*]], <2 x i32> [[X]], <2 x i32> <i32 17, i32 0>)
154 ; CHECK-NEXT: ret <2 x i32> [[R]]
156 %shl = shl <2 x i32> %x, <i32 17, i32 19>
157 %shr = lshr <2 x i32> %x, <i32 15, i32 poison>
158 %r = or <2 x i32> %shl, %shr
162 define <2 x i36> @rotl_v2i36_constant_nonsplat(<2 x i36> %x) {
163 ; CHECK-LABEL: @rotl_v2i36_constant_nonsplat(
164 ; CHECK-NEXT: [[R:%.*]] = call <2 x i36> @llvm.fshl.v2i36(<2 x i36> [[X:%.*]], <2 x i36> [[X]], <2 x i36> <i36 21, i36 11>)
165 ; CHECK-NEXT: ret <2 x i36> [[R]]
167 %shl = shl <2 x i36> %x, <i36 21, i36 11>
168 %shr = lshr <2 x i36> %x, <i36 15, i36 25>
169 %r = or <2 x i36> %shl, %shr
173 define <3 x i36> @rotl_v3i36_constant_nonsplat_poison0(<3 x i36> %x) {
174 ; CHECK-LABEL: @rotl_v3i36_constant_nonsplat_poison0(
175 ; CHECK-NEXT: [[R:%.*]] = call <3 x i36> @llvm.fshl.v3i36(<3 x i36> [[X:%.*]], <3 x i36> [[X]], <3 x i36> <i36 21, i36 11, i36 poison>)
176 ; CHECK-NEXT: ret <3 x i36> [[R]]
178 %shl = shl <3 x i36> %x, <i36 21, i36 11, i36 poison>
179 %shr = lshr <3 x i36> %x, <i36 15, i36 25, i36 poison>
180 %r = or <3 x i36> %shl, %shr
184 ; The most basic rotate by variable - no guards for UB due to oversized shifts.
185 ; This cannot be canonicalized to funnel shift target-independently. The safe
186 ; expansion includes masking for the shift amount that is not included here,
187 ; so it could be more expensive.
189 define i32 @rotl_i32(i32 %x, i32 %y) {
190 ; CHECK-LABEL: @rotl_i32(
191 ; CHECK-NEXT: [[SUB:%.*]] = sub i32 32, [[Y:%.*]]
192 ; CHECK-NEXT: [[SHL:%.*]] = shl i32 [[X:%.*]], [[Y]]
193 ; CHECK-NEXT: [[SHR:%.*]] = lshr i32 [[X]], [[SUB]]
194 ; CHECK-NEXT: [[R:%.*]] = or i32 [[SHR]], [[SHL]]
195 ; CHECK-NEXT: ret i32 [[R]]
197 %sub = sub i32 32, %y
198 %shl = shl i32 %x, %y
199 %shr = lshr i32 %x, %sub
200 %r = or i32 %shr, %shl
204 ; Non-power-of-2 types should follow the same reasoning. Left/right is determined by subtract.
206 define i37 @rotr_i37(i37 %x, i37 %y) {
207 ; CHECK-LABEL: @rotr_i37(
208 ; CHECK-NEXT: [[SUB:%.*]] = sub i37 37, [[Y:%.*]]
209 ; CHECK-NEXT: [[SHL:%.*]] = shl i37 [[X:%.*]], [[SUB]]
210 ; CHECK-NEXT: [[SHR:%.*]] = lshr i37 [[X]], [[Y]]
211 ; CHECK-NEXT: [[R:%.*]] = or i37 [[SHR]], [[SHL]]
212 ; CHECK-NEXT: ret i37 [[R]]
214 %sub = sub i37 37, %y
215 %shl = shl i37 %x, %sub
216 %shr = lshr i37 %x, %y
217 %r = or i37 %shr, %shl
221 ; Commute 'or' operands.
223 define i8 @rotr_i8_commute(i8 %x, i8 %y) {
224 ; CHECK-LABEL: @rotr_i8_commute(
225 ; CHECK-NEXT: [[SUB:%.*]] = sub i8 8, [[Y:%.*]]
226 ; CHECK-NEXT: [[SHL:%.*]] = shl i8 [[X:%.*]], [[SUB]]
227 ; CHECK-NEXT: [[SHR:%.*]] = lshr i8 [[X]], [[Y]]
228 ; CHECK-NEXT: [[R:%.*]] = or i8 [[SHL]], [[SHR]]
229 ; CHECK-NEXT: ret i8 [[R]]
232 %shl = shl i8 %x, %sub
233 %shr = lshr i8 %x, %y
234 %r = or i8 %shl, %shr
238 ; Vector types should follow the same rules.
240 define <4 x i32> @rotl_v4i32(<4 x i32> %x, <4 x i32> %y) {
241 ; CHECK-LABEL: @rotl_v4i32(
242 ; CHECK-NEXT: [[SUB:%.*]] = sub <4 x i32> splat (i32 32), [[Y:%.*]]
243 ; CHECK-NEXT: [[SHL:%.*]] = shl <4 x i32> [[X:%.*]], [[Y]]
244 ; CHECK-NEXT: [[SHR:%.*]] = lshr <4 x i32> [[X]], [[SUB]]
245 ; CHECK-NEXT: [[R:%.*]] = or <4 x i32> [[SHL]], [[SHR]]
246 ; CHECK-NEXT: ret <4 x i32> [[R]]
248 %sub = sub <4 x i32> <i32 32, i32 32, i32 32, i32 32>, %y
249 %shl = shl <4 x i32> %x, %y
250 %shr = lshr <4 x i32> %x, %sub
251 %r = or <4 x i32> %shl, %shr
255 ; Non-power-of-2 vector types should follow the same rules.
257 define <3 x i42> @rotr_v3i42(<3 x i42> %x, <3 x i42> %y) {
258 ; CHECK-LABEL: @rotr_v3i42(
259 ; CHECK-NEXT: [[SUB:%.*]] = sub <3 x i42> splat (i42 42), [[Y:%.*]]
260 ; CHECK-NEXT: [[SHL:%.*]] = shl <3 x i42> [[X:%.*]], [[SUB]]
261 ; CHECK-NEXT: [[SHR:%.*]] = lshr <3 x i42> [[X]], [[Y]]
262 ; CHECK-NEXT: [[R:%.*]] = or <3 x i42> [[SHR]], [[SHL]]
263 ; CHECK-NEXT: ret <3 x i42> [[R]]
265 %sub = sub <3 x i42> <i42 42, i42 42, i42 42>, %y
266 %shl = shl <3 x i42> %x, %sub
267 %shr = lshr <3 x i42> %x, %y
268 %r = or <3 x i42> %shr, %shl
272 ; This is the canonical pattern for a UB-safe rotate-by-variable with power-of-2-size scalar type.
273 ; The backend expansion of funnel shift for targets that don't have a rotate instruction should
274 ; match the original IR, so it is always good to canonicalize to the intrinsics for this pattern.
276 define i32 @rotl_safe_i32(i32 %x, i32 %y) {
277 ; CHECK-LABEL: @rotl_safe_i32(
278 ; CHECK-NEXT: [[R:%.*]] = call i32 @llvm.fshl.i32(i32 [[X:%.*]], i32 [[X]], i32 [[Y:%.*]])
279 ; CHECK-NEXT: ret i32 [[R]]
281 %negy = sub i32 0, %y
282 %ymask = and i32 %y, 31
283 %negymask = and i32 %negy, 31
284 %shl = shl i32 %x, %ymask
285 %shr = lshr i32 %x, %negymask
286 %r = or i32 %shr, %shl
290 ; Extra uses don't change anything.
292 define i16 @rotl_safe_i16_commute_extra_use(i16 %x, i16 %y, ptr %p) {
293 ; CHECK-LABEL: @rotl_safe_i16_commute_extra_use(
294 ; CHECK-NEXT: [[NEGY:%.*]] = sub i16 0, [[Y:%.*]]
295 ; CHECK-NEXT: [[NEGYMASK:%.*]] = and i16 [[NEGY]], 15
296 ; CHECK-NEXT: store i16 [[NEGYMASK]], ptr [[P:%.*]], align 2
297 ; CHECK-NEXT: [[R:%.*]] = call i16 @llvm.fshl.i16(i16 [[X:%.*]], i16 [[X]], i16 [[Y]])
298 ; CHECK-NEXT: ret i16 [[R]]
300 %negy = sub i16 0, %y
301 %ymask = and i16 %y, 15
302 %negymask = and i16 %negy, 15
303 store i16 %negymask, ptr %p
304 %shl = shl i16 %x, %ymask
305 %shr = lshr i16 %x, %negymask
306 %r = or i16 %shl, %shr
310 ; Left/right is determined by the negation.
312 define i64 @rotr_safe_i64(i64 %x, i64 %y) {
313 ; CHECK-LABEL: @rotr_safe_i64(
314 ; CHECK-NEXT: [[R:%.*]] = call i64 @llvm.fshr.i64(i64 [[X:%.*]], i64 [[X]], i64 [[Y:%.*]])
315 ; CHECK-NEXT: ret i64 [[R]]
317 %negy = sub i64 0, %y
318 %ymask = and i64 %y, 63
319 %negymask = and i64 %negy, 63
320 %shl = shl i64 %x, %negymask
321 %shr = lshr i64 %x, %ymask
322 %r = or i64 %shr, %shl
326 ; Extra uses don't change anything.
328 define i8 @rotr_safe_i8_commute_extra_use(i8 %x, i8 %y, ptr %p) {
329 ; CHECK-LABEL: @rotr_safe_i8_commute_extra_use(
330 ; CHECK-NEXT: [[NEGY:%.*]] = sub i8 0, [[Y:%.*]]
331 ; CHECK-NEXT: [[YMASK:%.*]] = and i8 [[Y]], 7
332 ; CHECK-NEXT: [[NEGYMASK:%.*]] = and i8 [[NEGY]], 7
333 ; CHECK-NEXT: [[SHL:%.*]] = shl i8 [[X:%.*]], [[NEGYMASK]]
334 ; CHECK-NEXT: [[SHR:%.*]] = lshr i8 [[X]], [[YMASK]]
335 ; CHECK-NEXT: store i8 [[SHR]], ptr [[P:%.*]], align 1
336 ; CHECK-NEXT: [[R:%.*]] = or i8 [[SHL]], [[SHR]]
337 ; CHECK-NEXT: ret i8 [[R]]
340 %ymask = and i8 %y, 7
341 %negymask = and i8 %negy, 7
342 %shl = shl i8 %x, %negymask
343 %shr = lshr i8 %x, %ymask
344 store i8 %shr, ptr %p
345 %r = or i8 %shl, %shr
349 ; Vectors follow the same rules.
351 define <2 x i32> @rotl_safe_v2i32(<2 x i32> %x, <2 x i32> %y) {
352 ; CHECK-LABEL: @rotl_safe_v2i32(
353 ; CHECK-NEXT: [[R:%.*]] = call <2 x i32> @llvm.fshl.v2i32(<2 x i32> [[X:%.*]], <2 x i32> [[X]], <2 x i32> [[Y:%.*]])
354 ; CHECK-NEXT: ret <2 x i32> [[R]]
356 %negy = sub <2 x i32> zeroinitializer, %y
357 %ymask = and <2 x i32> %y, <i32 31, i32 31>
358 %negymask = and <2 x i32> %negy, <i32 31, i32 31>
359 %shl = shl <2 x i32> %x, %ymask
360 %shr = lshr <2 x i32> %x, %negymask
361 %r = or <2 x i32> %shr, %shl
365 ; Vectors follow the same rules.
367 define <3 x i16> @rotr_safe_v3i16(<3 x i16> %x, <3 x i16> %y) {
368 ; CHECK-LABEL: @rotr_safe_v3i16(
369 ; CHECK-NEXT: [[R:%.*]] = call <3 x i16> @llvm.fshr.v3i16(<3 x i16> [[X:%.*]], <3 x i16> [[X]], <3 x i16> [[Y:%.*]])
370 ; CHECK-NEXT: ret <3 x i16> [[R]]
372 %negy = sub <3 x i16> zeroinitializer, %y
373 %ymask = and <3 x i16> %y, <i16 15, i16 15, i16 15>
374 %negymask = and <3 x i16> %negy, <i16 15, i16 15, i16 15>
375 %shl = shl <3 x i16> %x, %negymask
376 %shr = lshr <3 x i16> %x, %ymask
377 %r = or <3 x i16> %shr, %shl
381 ; These are optionally UB-free rotate left/right patterns that are narrowed to a smaller bitwidth.
382 ; See PR34046, PR16726, and PR39624 for motivating examples:
383 ; https://bugs.llvm.org/show_bug.cgi?id=34046
384 ; https://bugs.llvm.org/show_bug.cgi?id=16726
385 ; https://bugs.llvm.org/show_bug.cgi?id=39624
387 define i16 @rotate_left_16bit(i16 %v, i32 %shift) {
388 ; CHECK-LABEL: @rotate_left_16bit(
389 ; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[SHIFT:%.*]] to i16
390 ; CHECK-NEXT: [[CONV2:%.*]] = call i16 @llvm.fshl.i16(i16 [[V:%.*]], i16 [[V]], i16 [[TMP1]])
391 ; CHECK-NEXT: ret i16 [[CONV2]]
393 %and = and i32 %shift, 15
394 %conv = zext i16 %v to i32
395 %shl = shl i32 %conv, %and
396 %sub = sub i32 16, %and
397 %shr = lshr i32 %conv, %sub
398 %or = or i32 %shr, %shl
399 %conv2 = trunc i32 %or to i16
403 ; Commute the 'or' operands and try a vector type.
405 define <2 x i16> @rotate_left_commute_16bit_vec(<2 x i16> %v, <2 x i32> %shift) {
406 ; CHECK-LABEL: @rotate_left_commute_16bit_vec(
407 ; CHECK-NEXT: [[TMP1:%.*]] = trunc <2 x i32> [[SHIFT:%.*]] to <2 x i16>
408 ; CHECK-NEXT: [[CONV2:%.*]] = call <2 x i16> @llvm.fshl.v2i16(<2 x i16> [[V:%.*]], <2 x i16> [[V]], <2 x i16> [[TMP1]])
409 ; CHECK-NEXT: ret <2 x i16> [[CONV2]]
411 %and = and <2 x i32> %shift, <i32 15, i32 15>
412 %conv = zext <2 x i16> %v to <2 x i32>
413 %shl = shl <2 x i32> %conv, %and
414 %sub = sub <2 x i32> <i32 16, i32 16>, %and
415 %shr = lshr <2 x i32> %conv, %sub
416 %or = or <2 x i32> %shl, %shr
417 %conv2 = trunc <2 x i32> %or to <2 x i16>
421 ; Change the size, rotation direction (the subtract is on the left-shift), and mask op.
423 define i8 @rotate_right_8bit(i8 %v, i3 %shift) {
424 ; CHECK-LABEL: @rotate_right_8bit(
425 ; CHECK-NEXT: [[TMP1:%.*]] = zext i3 [[SHIFT:%.*]] to i8
426 ; CHECK-NEXT: [[CONV2:%.*]] = call i8 @llvm.fshr.i8(i8 [[V:%.*]], i8 [[V]], i8 [[TMP1]])
427 ; CHECK-NEXT: ret i8 [[CONV2]]
429 %and = zext i3 %shift to i32
430 %conv = zext i8 %v to i32
431 %shr = lshr i32 %conv, %and
432 %sub = sub i32 8, %and
433 %shl = shl i32 %conv, %sub
434 %or = or i32 %shl, %shr
435 %conv2 = trunc i32 %or to i8
439 ; The right-shifted value does not need to be a zexted value; here it is masked.
440 ; The shift mask could be less than the bitwidth, but this is still ok.
442 define i8 @rotate_right_commute_8bit_unmasked_shl(i32 %v, i32 %shift) {
443 ; CHECK-LABEL: @rotate_right_commute_8bit_unmasked_shl(
444 ; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[SHIFT:%.*]] to i8
445 ; CHECK-NEXT: [[TMP2:%.*]] = and i8 [[TMP1]], 3
446 ; CHECK-NEXT: [[TMP3:%.*]] = trunc i32 [[V:%.*]] to i8
447 ; CHECK-NEXT: [[TMP4:%.*]] = trunc i32 [[V]] to i8
448 ; CHECK-NEXT: [[CONV2:%.*]] = call i8 @llvm.fshr.i8(i8 [[TMP3]], i8 [[TMP4]], i8 [[TMP2]])
449 ; CHECK-NEXT: ret i8 [[CONV2]]
451 %and = and i32 %shift, 3
452 %conv = and i32 %v, 255
453 %shr = lshr i32 %conv, %and
454 %sub = sub i32 8, %and
455 %shl = shl i32 %conv, %sub
456 %or = or i32 %shr, %shl
457 %conv2 = trunc i32 %or to i8
461 ; The left-shifted value does not need to be masked at all.
463 define i8 @rotate_right_commute_8bit(i32 %v, i32 %shift) {
464 ; CHECK-LABEL: @rotate_right_commute_8bit(
465 ; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[SHIFT:%.*]] to i8
466 ; CHECK-NEXT: [[TMP2:%.*]] = and i8 [[TMP1]], 3
467 ; CHECK-NEXT: [[TMP3:%.*]] = trunc i32 [[V:%.*]] to i8
468 ; CHECK-NEXT: [[TMP4:%.*]] = trunc i32 [[V]] to i8
469 ; CHECK-NEXT: [[CONV2:%.*]] = call i8 @llvm.fshr.i8(i8 [[TMP3]], i8 [[TMP4]], i8 [[TMP2]])
470 ; CHECK-NEXT: ret i8 [[CONV2]]
472 %and = and i32 %shift, 3
473 %conv = and i32 %v, 255
474 %shr = lshr i32 %conv, %and
475 %sub = sub i32 8, %and
476 %shl = shl i32 %v, %sub
477 %or = or i32 %shr, %shl
478 %conv2 = trunc i32 %or to i8
482 ; If the original source does not mask the shift amount,
483 ; we still do the transform by adding masks to make it safe.
485 define i8 @rotate8_not_safe(i8 %v, i32 %shamt) {
486 ; CHECK-LABEL: @rotate8_not_safe(
487 ; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[SHAMT:%.*]] to i8
488 ; CHECK-NEXT: [[RET:%.*]] = call i8 @llvm.fshl.i8(i8 [[V:%.*]], i8 [[V]], i8 [[TMP1]])
489 ; CHECK-NEXT: ret i8 [[RET]]
491 %conv = zext i8 %v to i32
492 %sub = sub i32 8, %shamt
493 %shr = lshr i32 %conv, %sub
494 %shl = shl i32 %conv, %shamt
495 %or = or i32 %shr, %shl
496 %ret = trunc i32 %or to i8
500 ; A non-power-of-2 destination type can't be masked as above.
502 define i9 @rotate9_not_safe(i9 %v, i32 %shamt) {
503 ; CHECK-LABEL: @rotate9_not_safe(
504 ; CHECK-NEXT: [[CONV:%.*]] = zext i9 [[V:%.*]] to i32
505 ; CHECK-NEXT: [[SUB:%.*]] = sub i32 9, [[SHAMT:%.*]]
506 ; CHECK-NEXT: [[SHR:%.*]] = lshr i32 [[CONV]], [[SUB]]
507 ; CHECK-NEXT: [[SHL:%.*]] = shl i32 [[CONV]], [[SHAMT]]
508 ; CHECK-NEXT: [[OR:%.*]] = or i32 [[SHR]], [[SHL]]
509 ; CHECK-NEXT: [[RET:%.*]] = trunc i32 [[OR]] to i9
510 ; CHECK-NEXT: ret i9 [[RET]]
512 %conv = zext i9 %v to i32
513 %sub = sub i32 9, %shamt
514 %shr = lshr i32 %conv, %sub
515 %shl = shl i32 %conv, %shamt
516 %or = or i32 %shr, %shl
517 %ret = trunc i32 %or to i9
521 ; We should narrow (v << (s & 15)) | (v >> (-s & 15))
522 ; when both v and s have been promoted.
524 define i16 @rotateleft_16_neg_mask(i16 %v, i16 %shamt) {
525 ; CHECK-LABEL: @rotateleft_16_neg_mask(
526 ; CHECK-NEXT: [[OR:%.*]] = call i16 @llvm.fshl.i16(i16 [[V:%.*]], i16 [[V]], i16 [[SHAMT:%.*]])
527 ; CHECK-NEXT: ret i16 [[OR]]
529 %neg = sub i16 0, %shamt
530 %lshamt = and i16 %shamt, 15
531 %lshamtconv = zext i16 %lshamt to i32
532 %rshamt = and i16 %neg, 15
533 %rshamtconv = zext i16 %rshamt to i32
534 %conv = zext i16 %v to i32
535 %shl = shl i32 %conv, %lshamtconv
536 %shr = lshr i32 %conv, %rshamtconv
537 %or = or i32 %shr, %shl
538 %ret = trunc i32 %or to i16
542 define i16 @rotateleft_16_neg_mask_commute(i16 %v, i16 %shamt) {
543 ; CHECK-LABEL: @rotateleft_16_neg_mask_commute(
544 ; CHECK-NEXT: [[OR:%.*]] = call i16 @llvm.fshl.i16(i16 [[V:%.*]], i16 [[V]], i16 [[SHAMT:%.*]])
545 ; CHECK-NEXT: ret i16 [[OR]]
547 %neg = sub i16 0, %shamt
548 %lshamt = and i16 %shamt, 15
549 %lshamtconv = zext i16 %lshamt to i32
550 %rshamt = and i16 %neg, 15
551 %rshamtconv = zext i16 %rshamt to i32
552 %conv = zext i16 %v to i32
553 %shl = shl i32 %conv, %lshamtconv
554 %shr = lshr i32 %conv, %rshamtconv
555 %or = or i32 %shl, %shr
556 %ret = trunc i32 %or to i16
560 define i8 @rotateright_8_neg_mask(i8 %v, i8 %shamt) {
561 ; CHECK-LABEL: @rotateright_8_neg_mask(
562 ; CHECK-NEXT: [[OR:%.*]] = call i8 @llvm.fshr.i8(i8 [[V:%.*]], i8 [[V]], i8 [[SHAMT:%.*]])
563 ; CHECK-NEXT: ret i8 [[OR]]
565 %neg = sub i8 0, %shamt
566 %rshamt = and i8 %shamt, 7
567 %rshamtconv = zext i8 %rshamt to i32
568 %lshamt = and i8 %neg, 7
569 %lshamtconv = zext i8 %lshamt to i32
570 %conv = zext i8 %v to i32
571 %shl = shl i32 %conv, %lshamtconv
572 %shr = lshr i32 %conv, %rshamtconv
573 %or = or i32 %shr, %shl
574 %ret = trunc i32 %or to i8
578 define i8 @rotateright_8_neg_mask_commute(i8 %v, i8 %shamt) {
579 ; CHECK-LABEL: @rotateright_8_neg_mask_commute(
580 ; CHECK-NEXT: [[OR:%.*]] = call i8 @llvm.fshr.i8(i8 [[V:%.*]], i8 [[V]], i8 [[SHAMT:%.*]])
581 ; CHECK-NEXT: ret i8 [[OR]]
583 %neg = sub i8 0, %shamt
584 %rshamt = and i8 %shamt, 7
585 %rshamtconv = zext i8 %rshamt to i32
586 %lshamt = and i8 %neg, 7
587 %lshamtconv = zext i8 %lshamt to i32
588 %conv = zext i8 %v to i32
589 %shl = shl i32 %conv, %lshamtconv
590 %shr = lshr i32 %conv, %rshamtconv
591 %or = or i32 %shl, %shr
592 %ret = trunc i32 %or to i8
596 ; The shift amount may already be in the wide type,
597 ; so we need to truncate it going into the rotate pattern.
599 define i16 @rotateright_16_neg_mask_wide_amount(i16 %v, i32 %shamt) {
600 ; CHECK-LABEL: @rotateright_16_neg_mask_wide_amount(
601 ; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[SHAMT:%.*]] to i16
602 ; CHECK-NEXT: [[RET:%.*]] = call i16 @llvm.fshr.i16(i16 [[V:%.*]], i16 [[V]], i16 [[TMP1]])
603 ; CHECK-NEXT: ret i16 [[RET]]
605 %neg = sub i32 0, %shamt
606 %rshamt = and i32 %shamt, 15
607 %lshamt = and i32 %neg, 15
608 %conv = zext i16 %v to i32
609 %shl = shl i32 %conv, %lshamt
610 %shr = lshr i32 %conv, %rshamt
611 %or = or i32 %shr, %shl
612 %ret = trunc i32 %or to i16
616 define i16 @rotateright_16_neg_mask_wide_amount_commute(i16 %v, i32 %shamt) {
617 ; CHECK-LABEL: @rotateright_16_neg_mask_wide_amount_commute(
618 ; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[SHAMT:%.*]] to i16
619 ; CHECK-NEXT: [[RET:%.*]] = call i16 @llvm.fshr.i16(i16 [[V:%.*]], i16 [[V]], i16 [[TMP1]])
620 ; CHECK-NEXT: ret i16 [[RET]]
622 %neg = sub i32 0, %shamt
623 %rshamt = and i32 %shamt, 15
624 %lshamt = and i32 %neg, 15
625 %conv = zext i16 %v to i32
626 %shl = shl i32 %conv, %lshamt
627 %shr = lshr i32 %conv, %rshamt
628 %or = or i32 %shl, %shr
629 %ret = trunc i32 %or to i16
633 define i64 @rotateright_64_zext_neg_mask_amount(i64 %0, i32 %1) {
634 ; CHECK-LABEL: @rotateright_64_zext_neg_mask_amount(
635 ; CHECK-NEXT: [[TMP3:%.*]] = zext i32 [[TMP1:%.*]] to i64
636 ; CHECK-NEXT: [[TMP4:%.*]] = call i64 @llvm.fshr.i64(i64 [[TMP0:%.*]], i64 [[TMP0]], i64 [[TMP3]])
637 ; CHECK-NEXT: ret i64 [[TMP4]]
640 %4 = zext i32 %3 to i64
642 %6 = sub nsw i32 0, %1
644 %8 = zext i32 %7 to i64
650 define i8 @rotateleft_8_neg_mask_wide_amount(i8 %v, i32 %shamt) {
651 ; CHECK-LABEL: @rotateleft_8_neg_mask_wide_amount(
652 ; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[SHAMT:%.*]] to i8
653 ; CHECK-NEXT: [[RET:%.*]] = call i8 @llvm.fshl.i8(i8 [[V:%.*]], i8 [[V]], i8 [[TMP1]])
654 ; CHECK-NEXT: ret i8 [[RET]]
656 %neg = sub i32 0, %shamt
657 %lshamt = and i32 %shamt, 7
658 %rshamt = and i32 %neg, 7
659 %conv = zext i8 %v to i32
660 %shl = shl i32 %conv, %lshamt
661 %shr = lshr i32 %conv, %rshamt
662 %or = or i32 %shr, %shl
663 %ret = trunc i32 %or to i8
667 define i8 @rotateleft_8_neg_mask_wide_amount_commute(i8 %v, i32 %shamt) {
668 ; CHECK-LABEL: @rotateleft_8_neg_mask_wide_amount_commute(
669 ; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[SHAMT:%.*]] to i8
670 ; CHECK-NEXT: [[RET:%.*]] = call i8 @llvm.fshl.i8(i8 [[V:%.*]], i8 [[V]], i8 [[TMP1]])
671 ; CHECK-NEXT: ret i8 [[RET]]
673 %neg = sub i32 0, %shamt
674 %lshamt = and i32 %shamt, 7
675 %rshamt = and i32 %neg, 7
676 %conv = zext i8 %v to i32
677 %shl = shl i32 %conv, %lshamt
678 %shr = lshr i32 %conv, %rshamt
679 %or = or i32 %shl, %shr
680 %ret = trunc i32 %or to i8
684 define i64 @rotateleft_64_zext_neg_mask_amount(i64 %0, i32 %1) {
685 ; CHECK-LABEL: @rotateleft_64_zext_neg_mask_amount(
686 ; CHECK-NEXT: [[TMP3:%.*]] = zext i32 [[TMP1:%.*]] to i64
687 ; CHECK-NEXT: [[TMP4:%.*]] = call i64 @llvm.fshl.i64(i64 [[TMP0:%.*]], i64 [[TMP0]], i64 [[TMP3]])
688 ; CHECK-NEXT: ret i64 [[TMP4]]
691 %4 = zext i32 %3 to i64
693 %6 = sub nsw i32 0, %1
695 %8 = zext i32 %7 to i64
701 ; Non-power-of-2 types. This could be transformed, but it's not a typical rotate pattern.
703 define i9 @rotateleft_9_neg_mask_wide_amount_commute(i9 %v, i33 %shamt) {
704 ; CHECK-LABEL: @rotateleft_9_neg_mask_wide_amount_commute(
705 ; CHECK-NEXT: [[NEG:%.*]] = sub i33 0, [[SHAMT:%.*]]
706 ; CHECK-NEXT: [[LSHAMT:%.*]] = and i33 [[SHAMT]], 8
707 ; CHECK-NEXT: [[RSHAMT:%.*]] = and i33 [[NEG]], 8
708 ; CHECK-NEXT: [[CONV:%.*]] = zext i9 [[V:%.*]] to i33
709 ; CHECK-NEXT: [[SHL:%.*]] = shl nuw nsw i33 [[CONV]], [[LSHAMT]]
710 ; CHECK-NEXT: [[SHR:%.*]] = lshr i33 [[CONV]], [[RSHAMT]]
711 ; CHECK-NEXT: [[OR:%.*]] = or i33 [[SHL]], [[SHR]]
712 ; CHECK-NEXT: [[RET:%.*]] = trunc i33 [[OR]] to i9
713 ; CHECK-NEXT: ret i9 [[RET]]
715 %neg = sub i33 0, %shamt
716 %lshamt = and i33 %shamt, 8
717 %rshamt = and i33 %neg, 8
718 %conv = zext i9 %v to i33
719 %shl = shl i33 %conv, %lshamt
720 %shr = lshr i33 %conv, %rshamt
721 %or = or i33 %shl, %shr
722 %ret = trunc i33 %or to i9
726 ; Fold or(shl(v,x),lshr(v,bw-x)) iff x < bw
728 define i64 @rotl_sub_mask(i64 %0, i64 %1) {
729 ; CHECK-LABEL: @rotl_sub_mask(
730 ; CHECK-NEXT: [[TMP3:%.*]] = call i64 @llvm.fshl.i64(i64 [[TMP0:%.*]], i64 [[TMP0]], i64 [[TMP1:%.*]])
731 ; CHECK-NEXT: ret i64 [[TMP3]]
735 %5 = sub nuw nsw i64 64, %3
741 ; Fold or(lshr(v,x),shl(v,bw-x)) iff x < bw
743 define i64 @rotr_sub_mask(i64 %0, i64 %1) {
744 ; CHECK-LABEL: @rotr_sub_mask(
745 ; CHECK-NEXT: [[TMP3:%.*]] = call i64 @llvm.fshr.i64(i64 [[TMP0:%.*]], i64 [[TMP0]], i64 [[TMP1:%.*]])
746 ; CHECK-NEXT: ret i64 [[TMP3]]
750 %5 = sub nuw nsw i64 64, %3
756 define <2 x i64> @rotr_sub_mask_vector(<2 x i64> %0, <2 x i64> %1) {
757 ; CHECK-LABEL: @rotr_sub_mask_vector(
758 ; CHECK-NEXT: [[TMP3:%.*]] = call <2 x i64> @llvm.fshr.v2i64(<2 x i64> [[TMP0:%.*]], <2 x i64> [[TMP0]], <2 x i64> [[TMP1:%.*]])
759 ; CHECK-NEXT: ret <2 x i64> [[TMP3]]
761 %3 = and <2 x i64> %1, <i64 63, i64 63>
762 %4 = lshr <2 x i64> %0, %3
763 %5 = sub nuw nsw <2 x i64> <i64 64, i64 64>, %3
764 %6 = shl <2 x i64> %0, %5
765 %7 = or <2 x i64> %6, %4
769 ; Convert select pattern to masked shift that ends in 'or'.
771 define i32 @rotr_select(i32 %x, i32 %shamt) {
772 ; CHECK-LABEL: @rotr_select(
773 ; CHECK-NEXT: [[R:%.*]] = call i32 @llvm.fshr.i32(i32 [[X:%.*]], i32 [[X]], i32 [[SHAMT:%.*]])
774 ; CHECK-NEXT: ret i32 [[R]]
776 %cmp = icmp eq i32 %shamt, 0
777 %sub = sub i32 32, %shamt
778 %shr = lshr i32 %x, %shamt
779 %shl = shl i32 %x, %sub
780 %or = or i32 %shr, %shl
781 %r = select i1 %cmp, i32 %x, i32 %or
785 ; Convert select pattern to masked shift that ends in 'or'.
787 define i8 @rotr_select_commute(i8 %x, i8 %shamt) {
788 ; CHECK-LABEL: @rotr_select_commute(
789 ; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.fshr.i8(i8 [[X:%.*]], i8 [[X]], i8 [[SHAMT:%.*]])
790 ; CHECK-NEXT: ret i8 [[R]]
792 %cmp = icmp eq i8 %shamt, 0
793 %sub = sub i8 8, %shamt
794 %shr = lshr i8 %x, %shamt
795 %shl = shl i8 %x, %sub
796 %or = or i8 %shl, %shr
797 %r = select i1 %cmp, i8 %x, i8 %or
801 ; Convert select pattern to masked shift that ends in 'or'.
803 define i16 @rotl_select(i16 %x, i16 %shamt) {
804 ; CHECK-LABEL: @rotl_select(
805 ; CHECK-NEXT: [[R:%.*]] = call i16 @llvm.fshl.i16(i16 [[X:%.*]], i16 [[X]], i16 [[SHAMT:%.*]])
806 ; CHECK-NEXT: ret i16 [[R]]
808 %cmp = icmp eq i16 %shamt, 0
809 %sub = sub i16 16, %shamt
810 %shr = lshr i16 %x, %sub
811 %shl = shl i16 %x, %shamt
812 %or = or i16 %shr, %shl
813 %r = select i1 %cmp, i16 %x, i16 %or
817 ; Convert select pattern to masked shift that ends in 'or'.
819 define <2 x i64> @rotl_select_commute(<2 x i64> %x, <2 x i64> %shamt) {
820 ; CHECK-LABEL: @rotl_select_commute(
821 ; CHECK-NEXT: [[R:%.*]] = call <2 x i64> @llvm.fshl.v2i64(<2 x i64> [[X:%.*]], <2 x i64> [[X]], <2 x i64> [[SHAMT:%.*]])
822 ; CHECK-NEXT: ret <2 x i64> [[R]]
824 %cmp = icmp eq <2 x i64> %shamt, zeroinitializer
825 %sub = sub <2 x i64> <i64 64, i64 64>, %shamt
826 %shr = lshr <2 x i64> %x, %sub
827 %shl = shl <2 x i64> %x, %shamt
828 %or = or <2 x i64> %shl, %shr
829 %r = select <2 x i1> %cmp, <2 x i64> %x, <2 x i64> %or
833 ; Negative test - the transform is only valid with power-of-2 types.
835 define i24 @rotl_select_weird_type(i24 %x, i24 %shamt) {
836 ; CHECK-LABEL: @rotl_select_weird_type(
837 ; CHECK-NEXT: [[CMP:%.*]] = icmp eq i24 [[SHAMT:%.*]], 0
838 ; CHECK-NEXT: [[SUB:%.*]] = sub i24 24, [[SHAMT]]
839 ; CHECK-NEXT: [[SHR:%.*]] = lshr i24 [[X:%.*]], [[SUB]]
840 ; CHECK-NEXT: [[SHL:%.*]] = shl i24 [[X]], [[SHAMT]]
841 ; CHECK-NEXT: [[OR:%.*]] = or i24 [[SHL]], [[SHR]]
842 ; CHECK-NEXT: [[R:%.*]] = select i1 [[CMP]], i24 [[X]], i24 [[OR]]
843 ; CHECK-NEXT: ret i24 [[R]]
845 %cmp = icmp eq i24 %shamt, 0
846 %sub = sub i24 24, %shamt
847 %shr = lshr i24 %x, %sub
848 %shl = shl i24 %x, %shamt
849 %or = or i24 %shl, %shr
850 %r = select i1 %cmp, i24 %x, i24 %or
854 define i32 @rotl_select_zext_shamt(i32 %x, i8 %y) {
855 ; CHECK-LABEL: @rotl_select_zext_shamt(
856 ; CHECK-NEXT: [[TMP1:%.*]] = zext i8 [[Y:%.*]] to i32
857 ; CHECK-NEXT: [[R:%.*]] = call i32 @llvm.fshl.i32(i32 [[X:%.*]], i32 [[X]], i32 [[TMP1]])
858 ; CHECK-NEXT: ret i32 [[R]]
861 %cmp = icmp eq i8 %rem, 0
862 %sh_prom = zext i8 %rem to i32
863 %sub = sub nuw nsw i8 32, %rem
864 %sh_prom1 = zext i8 %sub to i32
865 %shr = lshr i32 %x, %sh_prom1
866 %shl = shl i32 %x, %sh_prom
867 %or = or i32 %shl, %shr
868 %r = select i1 %cmp, i32 %x, i32 %or
872 define i64 @rotr_select_zext_shamt(i64 %x, i32 %y) {
873 ; CHECK-LABEL: @rotr_select_zext_shamt(
874 ; CHECK-NEXT: [[TMP1:%.*]] = zext i32 [[Y:%.*]] to i64
875 ; CHECK-NEXT: [[R:%.*]] = call i64 @llvm.fshr.i64(i64 [[X:%.*]], i64 [[X]], i64 [[TMP1]])
876 ; CHECK-NEXT: ret i64 [[R]]
878 %rem = and i32 %y, 63
879 %cmp = icmp eq i32 %rem, 0
880 %sh_prom = zext i32 %rem to i64
881 %shr = lshr i64 %x, %sh_prom
882 %sub = sub nuw nsw i32 64, %rem
883 %sh_prom1 = zext i32 %sub to i64
884 %shl = shl i64 %x, %sh_prom1
885 %or = or i64 %shl, %shr
886 %r = select i1 %cmp, i64 %x, i64 %or
890 ; Test that the transform doesn't crash when there's an "or" with a ConstantExpr operand.
892 @external_global = external global i8
894 define i32 @rotl_constant_expr(i32 %shamt) {
895 ; CHECK-LABEL: @rotl_constant_expr(
896 ; CHECK-NEXT: [[SHR:%.*]] = lshr i32 ptrtoint (ptr @external_global to i32), [[SHAMT:%.*]]
897 ; CHECK-NEXT: [[SHL:%.*]] = shl i32 ptrtoint (ptr @external_global to i32), 11
898 ; CHECK-NEXT: [[R:%.*]] = or i32 [[SHR]], [[SHL]]
899 ; CHECK-NEXT: ret i32 [[R]]
901 %shr = lshr i32 ptrtoint (ptr @external_global to i32), %shamt
902 %shl = shl i32 ptrtoint (ptr @external_global to i32), 11
903 %r = or i32 %shr, %shl
907 ; PR20750 - https://bugs.llvm.org/show_bug.cgi?id=20750
908 ; This IR corresponds to C source where the shift amount is a smaller type than the rotated value:
909 ; unsigned int rotate32_doubleand1(unsigned int v, unsigned char r) { r = r & 31; return (v << r) | (v >> (((32 - r)) & 31)); }
911 define i32 @rotateleft32_doubleand1(i32 %v, i8 %r) {
912 ; CHECK-LABEL: @rotateleft32_doubleand1(
913 ; CHECK-NEXT: [[Z:%.*]] = zext i8 [[R:%.*]] to i32
914 ; CHECK-NEXT: [[OR:%.*]] = call i32 @llvm.fshl.i32(i32 [[V:%.*]], i32 [[V]], i32 [[Z]])
915 ; CHECK-NEXT: ret i32 [[OR]]
918 %z = zext i8 %m to i32
919 %neg = sub nsw i32 0, %z
920 %and2 = and i32 %neg, 31
921 %shl = shl i32 %v, %z
922 %shr = lshr i32 %v, %and2
923 %or = or i32 %shr, %shl
927 define i32 @rotateright32_doubleand1(i32 %v, i16 %r) {
928 ; CHECK-LABEL: @rotateright32_doubleand1(
929 ; CHECK-NEXT: [[Z:%.*]] = zext i16 [[R:%.*]] to i32
930 ; CHECK-NEXT: [[OR:%.*]] = call i32 @llvm.fshr.i32(i32 [[V:%.*]], i32 [[V]], i32 [[Z]])
931 ; CHECK-NEXT: ret i32 [[OR]]
934 %z = zext i16 %m to i32
935 %neg = sub nsw i32 0, %z
936 %and2 = and i32 %neg, 31
937 %shl = shl i32 %v, %and2
938 %shr = lshr i32 %v, %z
939 %or = or i32 %shr, %shl
943 ; TODO: This should be a rotate (funnel-shift).
945 define i8 @unmasked_shlop_unmasked_shift_amount(i32 %x, i32 %shamt) {
946 ; CHECK-LABEL: @unmasked_shlop_unmasked_shift_amount(
947 ; CHECK-NEXT: [[MASKX:%.*]] = and i32 [[X:%.*]], 255
948 ; CHECK-NEXT: [[T4:%.*]] = sub i32 8, [[SHAMT:%.*]]
949 ; CHECK-NEXT: [[T5:%.*]] = shl i32 [[X]], [[T4]]
950 ; CHECK-NEXT: [[T6:%.*]] = lshr i32 [[MASKX]], [[SHAMT]]
951 ; CHECK-NEXT: [[T7:%.*]] = or i32 [[T5]], [[T6]]
952 ; CHECK-NEXT: [[T8:%.*]] = trunc i32 [[T7]] to i8
953 ; CHECK-NEXT: ret i8 [[T8]]
955 %maskx = and i32 %x, 255
956 %t4 = sub i32 8, %shamt
957 %t5 = shl i32 %x, %t4
958 %t6 = lshr i32 %maskx, %shamt
959 %t7 = or i32 %t5, %t6
960 %t8 = trunc i32 %t7 to i8
964 define i16 @check_rotate_masked_16bit(i8 %shamt, i32 %cond) {
965 ; CHECK-LABEL: @check_rotate_masked_16bit(
966 ; CHECK-NEXT: [[TMP1:%.*]] = zext i8 [[SHAMT:%.*]] to i16
967 ; CHECK-NEXT: [[TMP2:%.*]] = trunc i32 [[COND:%.*]] to i16
968 ; CHECK-NEXT: [[TMP3:%.*]] = and i16 [[TMP2]], 1
969 ; CHECK-NEXT: [[TRUNC:%.*]] = call i16 @llvm.fshr.i16(i16 [[TMP3]], i16 [[TMP3]], i16 [[TMP1]])
970 ; CHECK-NEXT: ret i16 [[TRUNC]]
972 %maskx = and i32 %cond, 1
973 %masky = and i8 %shamt, 15
974 %z = zext i8 %masky to i32
975 %shr = lshr i32 %maskx, %z
976 %sub = sub i8 0, %shamt
977 %maskw = and i8 %sub, 15
978 %z2 = zext i8 %maskw to i32
979 %shl = shl nuw nsw i32 %maskx, %z2
980 %or = or i32 %shr, %shl
981 %trunc = trunc i32 %or to i16