1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2 ; REQUIRES: x86-registered-target
3 ; RUN: opt < %s -passes=reassociate,instcombine -S | FileCheck %s --check-prefixes=CHECK,REASSOC_AND_IC --allow-unused-prefixes
4 ; RUN: opt < %s -O2 -S | FileCheck %s --check-prefixes=CHECK,O2 --allow-unused-prefixes
6 target triple = "x86_64--"
8 ; Test cases in this file are intended to be run with both reassociate and
9 ; instcombine passes enabled.
11 ; Test numbering remains continuous across:
12 ; - InstCombine/fast-basictest.ll
13 ; - PhaseOrdering/fast-basictest.ll
14 ; - PhaseOrdering/fast-reassociate-gvn.ll
15 ; - Reassociate/fast-basictest.ll
17 ; test2 ... test18 - both reassociate and instcombine passes
18 ; are required to perform a transform
20 ; ((a + (-3)) + b) + 3 -> a + b
22 define float @test2(float %reg109, float %reg1111) {
23 ; CHECK-LABEL: @test2(
24 ; CHECK-NEXT: [[REG117:%.*]] = fadd fast float [[REG109:%.*]], [[REG1111:%.*]]
25 ; CHECK-NEXT: ret float [[REG117]]
27 %reg115 = fadd fast float %reg109, -3.000000e+01
28 %reg116 = fadd fast float %reg115, %reg1111
29 %reg117 = fadd fast float %reg116, 3.000000e+01
33 ; Verify that fold is not done without 'fast'
34 define float @test2_no_FMF(float %reg109, float %reg1111) {
35 ; CHECK-LABEL: @test2_no_FMF(
36 ; CHECK-NEXT: [[REG115:%.*]] = fadd float [[REG109:%.*]], -3.000000e+01
37 ; CHECK-NEXT: [[REG116:%.*]] = fadd float [[REG115]], [[REG1111:%.*]]
38 ; CHECK-NEXT: [[REG117:%.*]] = fadd float [[REG116]], 3.000000e+01
39 ; CHECK-NEXT: ret float [[REG117]]
41 %reg115 = fadd float %reg109, -3.000000e+01
42 %reg116 = fadd float %reg115, %reg1111
43 %reg117 = fadd float %reg116, 3.000000e+01
47 define float @test2_reassoc(float %reg109, float %reg1111) {
48 ; CHECK-LABEL: @test2_reassoc(
49 ; CHECK-NEXT: [[REG115:%.*]] = fadd reassoc float [[REG109:%.*]], -3.000000e+01
50 ; CHECK-NEXT: [[REG116:%.*]] = fadd reassoc float [[REG115]], [[REG1111:%.*]]
51 ; CHECK-NEXT: [[REG117:%.*]] = fadd reassoc float [[REG116]], 3.000000e+01
52 ; CHECK-NEXT: ret float [[REG117]]
54 %reg115 = fadd reassoc float %reg109, -3.000000e+01
55 %reg116 = fadd reassoc float %reg115, %reg1111
56 %reg117 = fadd reassoc float %reg116, 3.000000e+01
60 ; (x1 * 47) + (x2 * -47) => (x1 - x2) * 47
62 define float @test13(float %X1, float %X2) {
63 ; CHECK-LABEL: @test13(
64 ; CHECK-NEXT: [[TMP1:%.*]] = fsub fast float [[X1:%.*]], [[X2:%.*]]
65 ; CHECK-NEXT: [[TMP2:%.*]] = fmul fast float [[TMP1]], 4.700000e+01
66 ; CHECK-NEXT: ret float [[TMP2]]
68 %B = fmul fast float %X1, 47. ; X1*47
69 %C = fmul fast float %X2, -47. ; X2*-47
70 %D = fadd fast float %B, %C ; X1*47 + X2*-47 -> 47*(X1-X2)
74 ; Check again with 'reassoc' and 'nsz' ('nsz' not technically required).
75 define float @test13_reassoc_nsz(float %X1, float %X2) {
76 ; CHECK-LABEL: @test13_reassoc_nsz(
77 ; CHECK-NEXT: [[TMP1:%.*]] = fsub reassoc nsz float [[X1:%.*]], [[X2:%.*]]
78 ; CHECK-NEXT: [[TMP2:%.*]] = fmul reassoc nsz float [[TMP1]], 4.700000e+01
79 ; CHECK-NEXT: ret float [[TMP2]]
81 %B = fmul reassoc nsz float %X1, 47. ; X1*47
82 %C = fmul reassoc nsz float %X2, -47. ; X2*-47
83 %D = fadd reassoc nsz float %B, %C ; X1*47 + X2*-47 -> 47*(X1-X2)
87 ; TODO: This doesn't require 'nsz'. It should fold to ((x1 - x2) * 47.0)
88 define float @test13_reassoc(float %X1, float %X2) {
89 ; CHECK-LABEL: @test13_reassoc(
90 ; CHECK-NEXT: [[B:%.*]] = fmul reassoc float [[X1:%.*]], 4.700000e+01
91 ; CHECK-NEXT: [[C:%.*]] = fmul reassoc float [[X2:%.*]], 4.700000e+01
92 ; CHECK-NEXT: [[TMP1:%.*]] = fsub reassoc float [[B]], [[C]]
93 ; CHECK-NEXT: ret float [[TMP1]]
95 %B = fmul reassoc float %X1, 47. ; X1*47
96 %C = fmul reassoc float %X2, -47. ; X2*-47
97 %D = fadd reassoc float %B, %C ; X1*47 + X2*-47 -> 47*(X1-X2)
101 ; (b+(a+1234))+-a -> b+1234
103 define float @test15(float %b, float %a) {
104 ; CHECK-LABEL: @test15(
105 ; CHECK-NEXT: [[TMP1:%.*]] = fadd fast float [[B:%.*]], 1.234000e+03
106 ; CHECK-NEXT: ret float [[TMP1]]
108 %1 = fadd fast float %a, 1234.0
109 %2 = fadd fast float %b, %1
110 %3 = fsub fast float 0.0, %a
111 %4 = fadd fast float %2, %3
115 define float @test15_unary_fneg(float %b, float %a) {
116 ; CHECK-LABEL: @test15_unary_fneg(
117 ; CHECK-NEXT: [[TMP1:%.*]] = fadd fast float [[B:%.*]], 1.234000e+03
118 ; CHECK-NEXT: ret float [[TMP1]]
120 %1 = fadd fast float %a, 1234.0
121 %2 = fadd fast float %b, %1
122 %3 = fneg fast float %a
123 %4 = fadd fast float %2, %3
127 define float @test15_reassoc_nsz(float %b, float %a) {
128 ; CHECK-LABEL: @test15_reassoc_nsz(
129 ; CHECK-NEXT: [[TMP1:%.*]] = fadd reassoc nsz float [[B:%.*]], 1.234000e+03
130 ; CHECK-NEXT: ret float [[TMP1]]
132 %1 = fadd reassoc nsz float %a, 1234.0
133 %2 = fadd reassoc nsz float %b, %1
134 %3 = fsub reassoc nsz float 0.0, %a
135 %4 = fadd reassoc nsz float %2, %3
139 define float @test15_reassoc(float %b, float %a) {
140 ; CHECK-LABEL: @test15_reassoc(
141 ; CHECK-NEXT: [[TMP1:%.*]] = fadd reassoc float [[A:%.*]], 1.234000e+03
142 ; CHECK-NEXT: [[TMP2:%.*]] = fadd reassoc float [[TMP1]], [[B:%.*]]
143 ; CHECK-NEXT: [[TMP3:%.*]] = fsub reassoc float 0.000000e+00, [[A]]
144 ; CHECK-NEXT: [[TMP4:%.*]] = fadd reassoc float [[TMP3]], [[TMP2]]
145 ; CHECK-NEXT: ret float [[TMP4]]
147 %1 = fadd reassoc float %a, 1234.0
148 %2 = fadd reassoc float %b, %1
149 %3 = fsub reassoc float 0.0, %a
150 %4 = fadd reassoc float %2, %3
154 ; Test that we can turn things like X*-(Y*Z) -> X*-1*Y*Z.
156 define float @test16(float %a, float %b, float %z) {
157 ; REASSOC_AND_IC-LABEL: @test16(
158 ; REASSOC_AND_IC-NEXT: [[C:%.*]] = fmul fast float [[A:%.*]], 1.234500e+04
159 ; REASSOC_AND_IC-NEXT: [[E:%.*]] = fmul fast float [[C]], [[B:%.*]]
160 ; REASSOC_AND_IC-NEXT: [[F:%.*]] = fmul fast float [[E]], [[Z:%.*]]
161 ; REASSOC_AND_IC-NEXT: ret float [[F]]
164 ; O2-NEXT: [[D:%.*]] = fmul fast float [[A:%.*]], 1.234500e+04
165 ; O2-NEXT: [[E:%.*]] = fmul fast float [[D]], [[B:%.*]]
166 ; O2-NEXT: [[G:%.*]] = fmul fast float [[E]], [[Z:%.*]]
167 ; O2-NEXT: ret float [[G]]
169 %c = fsub fast float 0.000000e+00, %z
170 %d = fmul fast float %a, %b
171 %e = fmul fast float %c, %d
172 %f = fmul fast float %e, 1.234500e+04
173 %g = fsub fast float 0.000000e+00, %f
177 define float @test16_unary_fneg(float %a, float %b, float %z) {
178 ; REASSOC_AND_IC-LABEL: @test16_unary_fneg(
179 ; REASSOC_AND_IC-NEXT: [[E:%.*]] = fmul fast float [[A:%.*]], 1.234500e+04
180 ; REASSOC_AND_IC-NEXT: [[F:%.*]] = fmul fast float [[E]], [[B:%.*]]
181 ; REASSOC_AND_IC-NEXT: [[G:%.*]] = fmul fast float [[F]], [[Z:%.*]]
182 ; REASSOC_AND_IC-NEXT: ret float [[G]]
184 ; O2-LABEL: @test16_unary_fneg(
185 ; O2-NEXT: [[D:%.*]] = fmul fast float [[A:%.*]], 1.234500e+04
186 ; O2-NEXT: [[E:%.*]] = fmul fast float [[D]], [[B:%.*]]
187 ; O2-NEXT: [[G:%.*]] = fmul fast float [[E]], [[Z:%.*]]
188 ; O2-NEXT: ret float [[G]]
190 %c = fneg fast float %z
191 %d = fmul fast float %a, %b
192 %e = fmul fast float %c, %d
193 %f = fmul fast float %e, 1.234500e+04
194 %g = fneg fast float %f
198 define float @test16_reassoc_nsz(float %a, float %b, float %z) {
199 ; REASSOC_AND_IC-LABEL: @test16_reassoc_nsz(
200 ; REASSOC_AND_IC-NEXT: [[C:%.*]] = fmul reassoc nsz float [[A:%.*]], 1.234500e+04
201 ; REASSOC_AND_IC-NEXT: [[E:%.*]] = fmul reassoc nsz float [[C]], [[B:%.*]]
202 ; REASSOC_AND_IC-NEXT: [[F:%.*]] = fmul reassoc nsz float [[E]], [[Z:%.*]]
203 ; REASSOC_AND_IC-NEXT: ret float [[F]]
205 ; O2-LABEL: @test16_reassoc_nsz(
206 ; O2-NEXT: [[D:%.*]] = fmul reassoc nsz float [[A:%.*]], 1.234500e+04
207 ; O2-NEXT: [[E:%.*]] = fmul reassoc nsz float [[D]], [[B:%.*]]
208 ; O2-NEXT: [[G:%.*]] = fmul reassoc nsz float [[E]], [[Z:%.*]]
209 ; O2-NEXT: ret float [[G]]
211 %c = fsub reassoc nsz float 0.000000e+00, %z
212 %d = fmul reassoc nsz float %a, %b
213 %e = fmul reassoc nsz float %c, %d
214 %f = fmul reassoc nsz float %e, 1.234500e+04
215 %g = fsub reassoc nsz float 0.000000e+00, %f
219 define float @test16_reassoc(float %a, float %b, float %z) {
220 ; CHECK-LABEL: @test16_reassoc(
221 ; CHECK-NEXT: [[C:%.*]] = fsub reassoc float 0.000000e+00, [[Z:%.*]]
222 ; CHECK-NEXT: [[D:%.*]] = fmul reassoc float [[A:%.*]], [[B:%.*]]
223 ; CHECK-NEXT: [[E:%.*]] = fmul reassoc float [[D]], [[C]]
224 ; CHECK-NEXT: [[F:%.*]] = fmul reassoc float [[E]], 1.234500e+04
225 ; CHECK-NEXT: [[G:%.*]] = fsub reassoc float 0.000000e+00, [[F]]
226 ; CHECK-NEXT: ret float [[G]]
228 %c = fsub reassoc float 0.000000e+00, %z
229 %d = fmul reassoc float %a, %b
230 %e = fmul reassoc float %c, %d
231 %f = fmul reassoc float %e, 1.234500e+04
232 %g = fsub reassoc float 0.000000e+00, %f
236 ; With sub reassociation, constant folding can eliminate the 12 and -12 constants.
238 define float @test18(float %A, float %B) {
239 ; CHECK-LABEL: @test18(
240 ; CHECK-NEXT: [[Z:%.*]] = fsub fast float [[A:%.*]], [[B:%.*]]
241 ; CHECK-NEXT: ret float [[Z]]
243 %X = fadd fast float -1.200000e+01, %A
244 %Y = fsub fast float %X, %B
245 %Z = fadd fast float %Y, 1.200000e+01
249 define float @test18_reassoc(float %A, float %B) {
250 ; CHECK-LABEL: @test18_reassoc(
251 ; CHECK-NEXT: [[X:%.*]] = fadd reassoc float [[A:%.*]], -1.200000e+01
252 ; CHECK-NEXT: [[Y:%.*]] = fsub reassoc float [[X]], [[B:%.*]]
253 ; CHECK-NEXT: [[Z:%.*]] = fadd reassoc float [[Y]], 1.200000e+01
254 ; CHECK-NEXT: ret float [[Z]]
256 %X = fadd reassoc float -1.200000e+01, %A
257 %Y = fsub reassoc float %X, %B
258 %Z = fadd reassoc float %Y, 1.200000e+01
262 ; test18 - check that the bug described in the revision does not appear:
263 ; https://reviews.llvm.org/D72521
265 ; With sub reassociation, constant folding can eliminate the uses of %a.
267 define float @test19(float %a, float %b, float %c) nounwind {
268 ; REASSOC_AND_IC-LABEL: @test19(
269 ; REASSOC_AND_IC-NEXT: [[TMP1:%.*]] = fadd fast float [[B:%.*]], [[C:%.*]]
270 ; REASSOC_AND_IC-NEXT: [[T7:%.*]] = fneg fast float [[TMP1]]
271 ; REASSOC_AND_IC-NEXT: ret float [[T7]]
274 ; O2-NEXT: [[TMP1:%.*]] = fadd fast float [[C:%.*]], [[B:%.*]]
275 ; O2-NEXT: [[T7:%.*]] = fneg fast float [[TMP1]]
276 ; O2-NEXT: ret float [[T7]]
278 %t3 = fsub fast float %a, %b
279 %t5 = fsub fast float %t3, %c
280 %t7 = fsub fast float %t5, %a
284 define float @test19_reassoc_nsz(float %a, float %b, float %c) nounwind {
285 ; REASSOC_AND_IC-LABEL: @test19_reassoc_nsz(
286 ; REASSOC_AND_IC-NEXT: [[TMP1:%.*]] = fadd reassoc nsz float [[B:%.*]], [[C:%.*]]
287 ; REASSOC_AND_IC-NEXT: [[T7:%.*]] = fneg reassoc nsz float [[TMP1]]
288 ; REASSOC_AND_IC-NEXT: ret float [[T7]]
290 ; O2-LABEL: @test19_reassoc_nsz(
291 ; O2-NEXT: [[TMP1:%.*]] = fadd reassoc nsz float [[C:%.*]], [[B:%.*]]
292 ; O2-NEXT: [[T7:%.*]] = fneg reassoc nsz float [[TMP1]]
293 ; O2-NEXT: ret float [[T7]]
295 %t3 = fsub reassoc nsz float %a, %b
296 %t5 = fsub reassoc nsz float %t3, %c
297 %t7 = fsub reassoc nsz float %t5, %a
301 ; Verify the fold is not done with only 'reassoc' ('nsz' is required).
302 define float @test19_reassoc(float %a, float %b, float %c) nounwind {
303 ; CHECK-LABEL: @test19_reassoc(
304 ; CHECK-NEXT: [[T3:%.*]] = fsub reassoc float [[A:%.*]], [[B:%.*]]
305 ; CHECK-NEXT: [[T5:%.*]] = fsub reassoc float [[T3]], [[C:%.*]]
306 ; CHECK-NEXT: [[T7:%.*]] = fsub reassoc float [[T5]], [[A]]
307 ; CHECK-NEXT: ret float [[T7]]
309 %t3 = fsub reassoc float %a, %b
310 %t5 = fsub reassoc float %t3, %c
311 %t7 = fsub reassoc float %t5, %a