1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2 ; RUN: opt < %s -passes=indvars -S | FileCheck %s
4 target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
6 ; IV with constant start, preinc and postinc sign extends, with and without NSW.
7 ; IV rewrite only removes one sext. WidenIVs removes all three.
8 define void @postincConstIV(ptr %base, i32 %limit) nounwind {
9 ; CHECK-LABEL: @postincConstIV(
11 ; CHECK-NEXT: [[SMAX:%.*]] = call i32 @llvm.smax.i32(i32 [[LIMIT:%.*]], i32 0)
12 ; CHECK-NEXT: [[TMP0:%.*]] = add nuw i32 [[SMAX]], 1
13 ; CHECK-NEXT: [[WIDE_TRIP_COUNT:%.*]] = zext i32 [[TMP0]] to i64
14 ; CHECK-NEXT: br label [[LOOP:%.*]]
16 ; CHECK-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[LOOP]] ], [ 0, [[ENTRY:%.*]] ]
17 ; CHECK-NEXT: [[PREADR:%.*]] = getelementptr i8, ptr [[BASE:%.*]], i64 [[INDVARS_IV]]
18 ; CHECK-NEXT: store i8 0, ptr [[PREADR]], align 1
19 ; CHECK-NEXT: [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]], 1
20 ; CHECK-NEXT: [[POSTADR:%.*]] = getelementptr i8, ptr [[BASE]], i64 [[INDVARS_IV_NEXT]]
21 ; CHECK-NEXT: store i8 0, ptr [[POSTADR]], align 1
22 ; CHECK-NEXT: [[POSTADRNSW:%.*]] = getelementptr inbounds i8, ptr [[BASE]], i64 [[INDVARS_IV_NEXT]]
23 ; CHECK-NEXT: store i8 0, ptr [[POSTADRNSW]], align 1
24 ; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i64 [[INDVARS_IV_NEXT]], [[WIDE_TRIP_COUNT]]
25 ; CHECK-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[EXIT:%.*]]
27 ; CHECK-NEXT: br label [[RETURN:%.*]]
29 ; CHECK-NEXT: ret void
34 %iv = phi i32 [ %postiv, %loop ], [ 0, %entry ]
35 %ivnsw = phi i32 [ %postivnsw, %loop ], [ 0, %entry ]
36 %preofs = sext i32 %iv to i64
37 %preadr = getelementptr i8, ptr %base, i64 %preofs
38 store i8 0, ptr %preadr
39 %postiv = add i32 %iv, 1
40 %postofs = sext i32 %postiv to i64
41 %postadr = getelementptr i8, ptr %base, i64 %postofs
42 store i8 0, ptr %postadr
43 %postivnsw = add nsw i32 %ivnsw, 1
44 %postofsnsw = sext i32 %postivnsw to i64
45 %postadrnsw = getelementptr inbounds i8, ptr %base, i64 %postofsnsw
46 store i8 0, ptr %postadrnsw
47 %cond = icmp sgt i32 %limit, %iv
48 br i1 %cond, label %loop, label %exit
55 ; IV with nonconstant start, preinc and postinc sign extends,
56 ; with and without NSW.
57 ; As with postincConstIV, WidenIVs removes all three sexts.
58 define void @postincVarIV(ptr %base, i32 %init, i32 %limit) nounwind {
59 ; CHECK-LABEL: @postincVarIV(
61 ; CHECK-NEXT: [[PRECOND:%.*]] = icmp sgt i32 [[LIMIT:%.*]], [[INIT:%.*]]
62 ; CHECK-NEXT: br i1 [[PRECOND]], label [[LOOP_PREHEADER:%.*]], label [[RETURN:%.*]]
63 ; CHECK: loop.preheader:
64 ; CHECK-NEXT: [[TMP0:%.*]] = sext i32 [[INIT]] to i64
65 ; CHECK-NEXT: [[WIDE_TRIP_COUNT:%.*]] = sext i32 [[LIMIT]] to i64
66 ; CHECK-NEXT: br label [[LOOP:%.*]]
68 ; CHECK-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ [[TMP0]], [[LOOP_PREHEADER]] ], [ [[INDVARS_IV_NEXT:%.*]], [[LOOP]] ]
69 ; CHECK-NEXT: [[PREADR:%.*]] = getelementptr i8, ptr [[BASE:%.*]], i64 [[INDVARS_IV]]
70 ; CHECK-NEXT: store i8 0, ptr [[PREADR]], align 1
71 ; CHECK-NEXT: [[INDVARS_IV_NEXT]] = add nsw i64 [[INDVARS_IV]], 1
72 ; CHECK-NEXT: [[POSTADR:%.*]] = getelementptr i8, ptr [[BASE]], i64 [[INDVARS_IV_NEXT]]
73 ; CHECK-NEXT: store i8 0, ptr [[POSTADR]], align 1
74 ; CHECK-NEXT: [[POSTADRNSW:%.*]] = getelementptr i8, ptr [[BASE]], i64 [[INDVARS_IV_NEXT]]
75 ; CHECK-NEXT: store i8 0, ptr [[POSTADRNSW]], align 1
76 ; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i64 [[INDVARS_IV_NEXT]], [[WIDE_TRIP_COUNT]]
77 ; CHECK-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[EXIT:%.*]]
79 ; CHECK-NEXT: br label [[RETURN]]
81 ; CHECK-NEXT: ret void
84 %precond = icmp sgt i32 %limit, %init
85 br i1 %precond, label %loop, label %return
87 %iv = phi i32 [ %postiv, %loop ], [ %init, %entry ]
88 %ivnsw = phi i32 [ %postivnsw, %loop ], [ %init, %entry ]
89 %preofs = sext i32 %iv to i64
90 %preadr = getelementptr i8, ptr %base, i64 %preofs
91 store i8 0, ptr %preadr
92 %postiv = add i32 %iv, 1
93 %postofs = sext i32 %postiv to i64
94 %postadr = getelementptr i8, ptr %base, i64 %postofs
95 store i8 0, ptr %postadr
96 %postivnsw = add nsw i32 %ivnsw, 1
97 %postofsnsw = sext i32 %postivnsw to i64
98 %postadrnsw = getelementptr i8, ptr %base, i64 %postofsnsw
99 store i8 0, ptr %postadrnsw
100 %cond = icmp sgt i32 %limit, %postiv
101 br i1 %cond, label %loop, label %exit
108 ; Test sign extend elimination in the inner and outer loop.
109 ; %outercount is straightforward to widen, besides being in an outer loop.
110 ; %innercount is currently blocked by lcssa, so is not widened.
111 ; %inneriv can be widened only after proving it has no signed-overflow
112 ; based on the loop test.
113 define void @nestedIV(ptr %address, i32 %limit) nounwind {
114 ; CHECK-LABEL: @nestedIV(
116 ; CHECK-NEXT: [[LIMITDEC:%.*]] = add i32 [[LIMIT:%.*]], -1
117 ; CHECK-NEXT: [[TMP0:%.*]] = sext i32 [[LIMITDEC]] to i64
118 ; CHECK-NEXT: [[SMAX:%.*]] = call i32 @llvm.smax.i32(i32 [[LIMIT]], i32 1)
119 ; CHECK-NEXT: [[WIDE_TRIP_COUNT:%.*]] = zext i32 [[SMAX]] to i64
120 ; CHECK-NEXT: br label [[OUTERLOOP:%.*]]
122 ; CHECK-NEXT: [[INDVARS_IV1:%.*]] = phi i64 [ [[INDVARS_IV_NEXT2:%.*]], [[OUTERMERGE:%.*]] ], [ 0, [[ENTRY:%.*]] ]
123 ; CHECK-NEXT: [[INNERCOUNT:%.*]] = phi i32 [ [[INNERCOUNT_MERGE:%.*]], [[OUTERMERGE]] ], [ 0, [[ENTRY]] ]
124 ; CHECK-NEXT: [[TMP1:%.*]] = add nsw i64 [[INDVARS_IV1]], -1
125 ; CHECK-NEXT: [[ADR1:%.*]] = getelementptr i8, ptr [[ADDRESS:%.*]], i64 [[TMP1]]
126 ; CHECK-NEXT: store i8 0, ptr [[ADR1]], align 1
127 ; CHECK-NEXT: br label [[INNERPREHEADER:%.*]]
128 ; CHECK: innerpreheader:
129 ; CHECK-NEXT: [[INNERPRECMP:%.*]] = icmp sgt i32 [[LIMITDEC]], [[INNERCOUNT]]
130 ; CHECK-NEXT: br i1 [[INNERPRECMP]], label [[INNERLOOP_PREHEADER:%.*]], label [[OUTERMERGE]]
131 ; CHECK: innerloop.preheader:
132 ; CHECK-NEXT: [[TMP2:%.*]] = sext i32 [[INNERCOUNT]] to i64
133 ; CHECK-NEXT: br label [[INNERLOOP:%.*]]
135 ; CHECK-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ [[TMP2]], [[INNERLOOP_PREHEADER]] ], [ [[INDVARS_IV_NEXT:%.*]], [[INNERLOOP]] ]
136 ; CHECK-NEXT: [[INDVARS_IV_NEXT]] = add nsw i64 [[INDVARS_IV]], 1
137 ; CHECK-NEXT: [[ADR2:%.*]] = getelementptr i8, ptr [[ADDRESS]], i64 [[INDVARS_IV]]
138 ; CHECK-NEXT: store i8 0, ptr [[ADR2]], align 1
139 ; CHECK-NEXT: [[ADR3:%.*]] = getelementptr i8, ptr [[ADDRESS]], i64 [[INDVARS_IV_NEXT]]
140 ; CHECK-NEXT: store i8 0, ptr [[ADR3]], align 1
141 ; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i64 [[INDVARS_IV_NEXT]], [[TMP0]]
142 ; CHECK-NEXT: br i1 [[EXITCOND]], label [[INNERLOOP]], label [[INNEREXIT:%.*]]
144 ; CHECK-NEXT: [[INNERCOUNT_LCSSA_WIDE:%.*]] = phi i64 [ [[INDVARS_IV_NEXT]], [[INNERLOOP]] ]
145 ; CHECK-NEXT: [[TMP3:%.*]] = trunc i64 [[INNERCOUNT_LCSSA_WIDE]] to i32
146 ; CHECK-NEXT: br label [[OUTERMERGE]]
148 ; CHECK-NEXT: [[INNERCOUNT_MERGE]] = phi i32 [ [[TMP3]], [[INNEREXIT]] ], [ [[INNERCOUNT]], [[INNERPREHEADER]] ]
149 ; CHECK-NEXT: [[ADR4:%.*]] = getelementptr i8, ptr [[ADDRESS]], i64 [[INDVARS_IV1]]
150 ; CHECK-NEXT: store i8 0, ptr [[ADR4]], align 1
151 ; CHECK-NEXT: [[OFS5:%.*]] = sext i32 [[INNERCOUNT_MERGE]] to i64
152 ; CHECK-NEXT: [[ADR5:%.*]] = getelementptr i8, ptr [[ADDRESS]], i64 [[OFS5]]
153 ; CHECK-NEXT: store i8 0, ptr [[ADR5]], align 1
154 ; CHECK-NEXT: [[INDVARS_IV_NEXT2]] = add nuw nsw i64 [[INDVARS_IV1]], 1
155 ; CHECK-NEXT: [[EXITCOND4:%.*]] = icmp ne i64 [[INDVARS_IV_NEXT2]], [[WIDE_TRIP_COUNT]]
156 ; CHECK-NEXT: br i1 [[EXITCOND4]], label [[OUTERLOOP]], label [[RETURN:%.*]]
158 ; CHECK-NEXT: ret void
161 %limitdec = add i32 %limit, -1
164 ; Eliminate %ofs1 after widening outercount.
165 ; IV rewriting hoists a gep into this block. We don't like that.
167 %outercount = phi i32 [ %outerpostcount, %outermerge ], [ 0, %entry ]
168 %innercount = phi i32 [ %innercount.merge, %outermerge ], [ 0, %entry ]
170 %outercountdec = add i32 %outercount, -1
171 %ofs1 = sext i32 %outercountdec to i64
172 %adr1 = getelementptr i8, ptr %address, i64 %ofs1
173 store i8 0, ptr %adr1
175 br label %innerpreheader
178 %innerprecmp = icmp sgt i32 %limitdec, %innercount
179 br i1 %innerprecmp, label %innerloop, label %outermerge
181 ; Eliminate %ofs2 after widening inneriv.
182 ; Eliminate %ofs3 after normalizing sext(innerpostiv)
183 ; FIXME: We should check that indvars does not increase the number of
184 ; IVs in this loop. sext elimination plus LFTR currently results in 2 final
185 ; IVs. Waiting to remove LFTR.
187 %inneriv = phi i32 [ %innerpostiv, %innerloop ], [ %innercount, %innerpreheader ]
188 %innerpostiv = add i32 %inneriv, 1
190 %ofs2 = sext i32 %inneriv to i64
191 %adr2 = getelementptr i8, ptr %address, i64 %ofs2
192 store i8 0, ptr %adr2
194 %ofs3 = sext i32 %innerpostiv to i64
195 %adr3 = getelementptr i8, ptr %address, i64 %ofs3
196 store i8 0, ptr %adr3
198 %innercmp = icmp sgt i32 %limitdec, %innerpostiv
199 br i1 %innercmp, label %innerloop, label %innerexit
202 %innercount.lcssa = phi i32 [ %innerpostiv, %innerloop ]
205 ; Eliminate %ofs4 after widening outercount
206 ; TODO: Eliminate %ofs5 after removing lcssa
208 %innercount.merge = phi i32 [ %innercount.lcssa, %innerexit ], [ %innercount, %innerpreheader ]
210 %ofs4 = sext i32 %outercount to i64
211 %adr4 = getelementptr i8, ptr %address, i64 %ofs4
212 store i8 0, ptr %adr4
214 %ofs5 = sext i32 %innercount.merge to i64
215 %adr5 = getelementptr i8, ptr %address, i64 %ofs5
216 store i8 0, ptr %adr5
218 %outerpostcount = add i32 %outercount, 1
219 %tmp47 = icmp slt i32 %outerpostcount, %limit
220 br i1 %tmp47, label %outerloop, label %return