xref: /llvm-project/llvm/test/CodeGen/Thumb2/LowOverheadLoops/while-loops.ll (revision 7b3bbd83c0c24087072ec5b22a76799ab31f87d5) 
1; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
2; RUN: llc -mtriple=thumbv8.1m.main-none-eabi -mattr=+mve --verify-machineinstrs %s -o - | FileCheck %s
3
4; Tail predicated so we use DLSTP
5define void @simple(ptr nocapture readonly %x, ptr nocapture readnone %y, ptr nocapture %z, i32 %m, i32 %n) {
6; CHECK-LABEL: simple:
7; CHECK:       @ %bb.0: @ %entry
8; CHECK-NEXT:    .save {r7, lr}
9; CHECK-NEXT:    push {r7, lr}
10; CHECK-NEXT:    ldr r1, [sp, #8]
11; CHECK-NEXT:    mov r12, r3
12; CHECK-NEXT:    adds r3, r1, #3
13; CHECK-NEXT:    lsrs r3, r3, #2
14; CHECK-NEXT:    beq .LBB0_3
15; CHECK-NEXT:  @ %bb.1: @ %do.body.preheader
16; CHECK-NEXT:    dlstp.32 lr, r1
17; CHECK-NEXT:  .LBB0_2: @ %do.body
18; CHECK-NEXT:    @ =>This Inner Loop Header: Depth=1
19; CHECK-NEXT:    vldrw.u32 q0, [r0], #16
20; CHECK-NEXT:    vaddva.s32 r12, q0
21; CHECK-NEXT:    letp lr, .LBB0_2
22; CHECK-NEXT:  .LBB0_3: @ %if.end
23; CHECK-NEXT:    str.w r12, [r2]
24; CHECK-NEXT:    pop {r7, pc}
25entry:
26  %add = add i32 %n, 3
27  %div = lshr i32 %add, 2
28  %cmp.not = icmp eq i32 %div, 0
29  br i1 %cmp.not, label %if.end, label %do.body
30
31do.body:                                          ; preds = %entry, %do.body
32  %n.addr.0 = phi i32 [ %sub, %do.body ], [ %n, %entry ]
33  %count.0 = phi i32 [ %sub3, %do.body ], [ %div, %entry ]
34  %s.0 = phi i32 [ %add2, %do.body ], [ %m, %entry ]
35  %x.addr.0 = phi ptr [ %add.ptr, %do.body ], [ %x, %entry ]
36  %0 = tail call <4 x i1> @llvm.arm.mve.vctp32(i32 %n.addr.0)
37  %1 = load <4 x i32>, ptr %x.addr.0, align 4
38  %2 = tail call i32 @llvm.arm.mve.addv.predicated.v4i32.v4i1(<4 x i32> %1, i32 0, <4 x i1> %0)
39  %add2 = add nsw i32 %2, %s.0
40  %add.ptr = getelementptr inbounds i32, ptr %x.addr.0, i32 4
41  %sub = add i32 %n.addr.0, -4
42  %sub3 = add nsw i32 %count.0, -1
43  %cmp4 = icmp sgt i32 %count.0, 1
44  br i1 %cmp4, label %do.body, label %if.end
45
46if.end:                                           ; preds = %do.body, %entry
47  %s.1 = phi i32 [ %m, %entry ], [ %add2, %do.body ]
48  store i32 %s.1, ptr %z, align 4
49  ret void
50}
51
52; Tail predicated so we use DLSTP
53define void @nested(ptr nocapture readonly %x, ptr nocapture readnone %y, ptr nocapture %z, i32 %m, i32 %n) {
54; CHECK-LABEL: nested:
55; CHECK:       @ %bb.0: @ %entry
56; CHECK-NEXT:    cmp r3, #0
57; CHECK-NEXT:    it eq
58; CHECK-NEXT:    bxeq lr
59; CHECK-NEXT:  .LBB1_1: @ %for.body.preheader
60; CHECK-NEXT:    .save {r4, r5, r6, r7, r8, lr}
61; CHECK-NEXT:    push.w {r4, r5, r6, r7, r8, lr}
62; CHECK-NEXT:    ldr.w r12, [sp, #24]
63; CHECK-NEXT:    movs r1, #0
64; CHECK-NEXT:    b .LBB1_4
65; CHECK-NEXT:  .LBB1_2: @ in Loop: Header=BB1_4 Depth=1
66; CHECK-NEXT:    mov r4, r3
67; CHECK-NEXT:  .LBB1_3: @ %if.end
68; CHECK-NEXT:    @ in Loop: Header=BB1_4 Depth=1
69; CHECK-NEXT:    str.w r4, [r2, r1, lsl #2]
70; CHECK-NEXT:    adds r1, #1
71; CHECK-NEXT:    cmp r1, r3
72; CHECK-NEXT:    beq .LBB1_8
73; CHECK-NEXT:  .LBB1_4: @ %for.body
74; CHECK-NEXT:    @ =>This Loop Header: Depth=1
75; CHECK-NEXT:    @ Child Loop BB1_6 Depth 2
76; CHECK-NEXT:    add.w r6, r12, #3
77; CHECK-NEXT:    lsrs r7, r6, #2
78; CHECK-NEXT:    beq .LBB1_2
79; CHECK-NEXT:  @ %bb.5: @ %do.body.preheader
80; CHECK-NEXT:    @ in Loop: Header=BB1_4 Depth=1
81; CHECK-NEXT:    bic r5, r6, #3
82; CHECK-NEXT:    mov r4, r3
83; CHECK-NEXT:    add.w r8, r0, r5, lsl #2
84; CHECK-NEXT:    dlstp.32 lr, r12
85; CHECK-NEXT:  .LBB1_6: @ %do.body
86; CHECK-NEXT:    @ Parent Loop BB1_4 Depth=1
87; CHECK-NEXT:    @ => This Inner Loop Header: Depth=2
88; CHECK-NEXT:    vldrw.u32 q0, [r0], #16
89; CHECK-NEXT:    vaddva.s32 r4, q0
90; CHECK-NEXT:    letp lr, .LBB1_6
91; CHECK-NEXT:  @ %bb.7: @ %if.end.loopexit
92; CHECK-NEXT:    @ in Loop: Header=BB1_4 Depth=1
93; CHECK-NEXT:    sub.w r12, r12, r5
94; CHECK-NEXT:    mov r0, r8
95; CHECK-NEXT:    b .LBB1_3
96; CHECK-NEXT:  .LBB1_8:
97; CHECK-NEXT:    pop.w {r4, r5, r6, r7, r8, lr}
98; CHECK-NEXT:    bx lr
99entry:
100  %cmp20.not = icmp eq i32 %m, 0
101  br i1 %cmp20.not, label %for.cond.cleanup, label %for.body
102
103for.cond.cleanup:                                 ; preds = %if.end, %entry
104  ret void
105
106for.body:                                         ; preds = %entry, %if.end
107  %x.addr.023 = phi ptr [ %x.addr.2, %if.end ], [ %x, %entry ]
108  %a.022 = phi i32 [ %inc, %if.end ], [ 0, %entry ]
109  %n.addr.021 = phi i32 [ %n.addr.2, %if.end ], [ %n, %entry ]
110  %add = add i32 %n.addr.021, 3
111  %div = lshr i32 %add, 2
112  %cmp1.not = icmp eq i32 %div, 0
113  br i1 %cmp1.not, label %if.end, label %do.body.preheader
114
115do.body.preheader:                                ; preds = %for.body
116  %0 = and i32 %add, -4
117  %scevgep = getelementptr i32, ptr %x.addr.023, i32 %0
118  br label %do.body
119
120do.body:                                          ; preds = %do.body.preheader, %do.body
121  %n.addr.1 = phi i32 [ %sub, %do.body ], [ %n.addr.021, %do.body.preheader ]
122  %count.0 = phi i32 [ %sub4, %do.body ], [ %div, %do.body.preheader ]
123  %s.0 = phi i32 [ %add3, %do.body ], [ %m, %do.body.preheader ]
124  %x.addr.1 = phi ptr [ %add.ptr, %do.body ], [ %x.addr.023, %do.body.preheader ]
125  %1 = tail call <4 x i1> @llvm.arm.mve.vctp32(i32 %n.addr.1)
126  %2 = load <4 x i32>, ptr %x.addr.1, align 4
127  %3 = tail call i32 @llvm.arm.mve.addv.predicated.v4i32.v4i1(<4 x i32> %2, i32 0, <4 x i1> %1)
128  %add3 = add nsw i32 %3, %s.0
129  %add.ptr = getelementptr inbounds i32, ptr %x.addr.1, i32 4
130  %sub = add i32 %n.addr.1, -4
131  %sub4 = add nsw i32 %count.0, -1
132  %cmp5 = icmp sgt i32 %count.0, 1
133  br i1 %cmp5, label %do.body, label %if.end.loopexit
134
135if.end.loopexit:                                  ; preds = %do.body
136  %4 = sub i32 %n.addr.021, %0
137  br label %if.end
138
139if.end:                                           ; preds = %if.end.loopexit, %for.body
140  %n.addr.2 = phi i32 [ %n.addr.021, %for.body ], [ %4, %if.end.loopexit ]
141  %s.1 = phi i32 [ %m, %for.body ], [ %add3, %if.end.loopexit ]
142  %x.addr.2 = phi ptr [ %x.addr.023, %for.body ], [ %scevgep, %if.end.loopexit ]
143  %arrayidx = getelementptr inbounds i32, ptr %z, i32 %a.022
144  store i32 %s.1, ptr %arrayidx, align 4
145  %inc = add nuw nsw i32 %a.022, 1
146  %exitcond.not = icmp eq i32 %inc, %m
147  br i1 %exitcond.not, label %for.cond.cleanup, label %for.body
148}
149
150declare <4 x i1> @llvm.arm.mve.vctp32(i32)
151declare i32 @llvm.arm.mve.addv.predicated.v4i32.v4i1(<4 x i32>, i32, <4 x i1>)
152
153
154; Long test that was spilling lr between t2LoopDec and End
155define dso_local i32 @b(ptr %c, i32 %d, i32 %e, ptr %n) "frame-pointer"="all" {
156; CHECK-LABEL: b:
157; CHECK:       @ %bb.0: @ %entry
158; CHECK-NEXT:    .save {r4, r5, r6, r7, lr}
159; CHECK-NEXT:    push {r4, r5, r6, r7, lr}
160; CHECK-NEXT:    .setfp r7, sp, #12
161; CHECK-NEXT:    add r7, sp, #12
162; CHECK-NEXT:    .save {r8, r9, r10, r11}
163; CHECK-NEXT:    push.w {r8, r9, r10, r11}
164; CHECK-NEXT:    .pad #16
165; CHECK-NEXT:    sub sp, #16
166; CHECK-NEXT:    wls lr, r1, .LBB2_3
167; CHECK-NEXT:  @ %bb.1: @ %while.body.preheader
168; CHECK-NEXT:    adds r6, r3, #4
169; CHECK-NEXT:    adds r1, r0, #4
170; CHECK-NEXT:    mvn r8, #1
171; CHECK-NEXT:    @ implicit-def: $r9
172; CHECK-NEXT:    @ implicit-def: $r4
173; CHECK-NEXT:    str r2, [sp] @ 4-byte Spill
174; CHECK-NEXT:  .LBB2_2: @ %while.body
175; CHECK-NEXT:    @ =>This Inner Loop Header: Depth=1
176; CHECK-NEXT:    str r1, [sp, #12] @ 4-byte Spill
177; CHECK-NEXT:    asrs r2, r4, #31
178; CHECK-NEXT:    ldr r1, [sp, #12] @ 4-byte Reload
179; CHECK-NEXT:    ldr r1, [r1]
180; CHECK-NEXT:    muls r1, r3, r1
181; CHECK-NEXT:    adds r4, r4, r1
182; CHECK-NEXT:    adc.w r1, r2, r1, asr #31
183; CHECK-NEXT:    adds.w r2, r4, #-2147483648
184; CHECK-NEXT:    ldrd r2, r4, [r8]
185; CHECK-NEXT:    adc r5, r1, #0
186; CHECK-NEXT:    str r2, [sp, #4] @ 4-byte Spill
187; CHECK-NEXT:    smull r4, r2, r4, r9
188; CHECK-NEXT:    asrs r1, r5, #31
189; CHECK-NEXT:    str r5, [sp, #8] @ 4-byte Spill
190; CHECK-NEXT:    subs r4, r5, r4
191; CHECK-NEXT:    sbcs r1, r2
192; CHECK-NEXT:    ldr r2, [sp, #12] @ 4-byte Reload
193; CHECK-NEXT:    adds.w r10, r4, #-2147483648
194; CHECK-NEXT:    adc r1, r1, #0
195; CHECK-NEXT:    ldr r4, [r2, #-4]
196; CHECK-NEXT:    muls r4, r3, r4
197; CHECK-NEXT:    adds r3, #4
198; CHECK-NEXT:    adds.w r12, r4, #-2147483648
199; CHECK-NEXT:    asr.w r5, r4, #31
200; CHECK-NEXT:    ldr r4, [r6]
201; CHECK-NEXT:    adc r5, r5, #0
202; CHECK-NEXT:    mul r2, r4, r0
203; CHECK-NEXT:    adds r0, #4
204; CHECK-NEXT:    add.w r2, r2, #-2147483648
205; CHECK-NEXT:    asrl r12, r5, r2
206; CHECK-NEXT:    smull r2, r5, r4, r12
207; CHECK-NEXT:    lsll r2, r5, #30
208; CHECK-NEXT:    ldr r2, [sp, #4] @ 4-byte Reload
209; CHECK-NEXT:    asr.w r11, r5, #31
210; CHECK-NEXT:    mov r12, r5
211; CHECK-NEXT:    lsll r12, r11, r4
212; CHECK-NEXT:    mul r2, r2, r9
213; CHECK-NEXT:    lsrl r12, r11, #2
214; CHECK-NEXT:    adds r2, #2
215; CHECK-NEXT:    lsll r12, r11, r2
216; CHECK-NEXT:    ldr r2, [sp] @ 4-byte Reload
217; CHECK-NEXT:    add.w r5, r12, #-2147483648
218; CHECK-NEXT:    asrl r10, r1, r5
219; CHECK-NEXT:    ldr r5, [sp, #8] @ 4-byte Reload
220; CHECK-NEXT:    lsrl r10, r1, #2
221; CHECK-NEXT:    movs r1, #2
222; CHECK-NEXT:    mov r9, r10
223; CHECK-NEXT:    str.w r10, [r1]
224; CHECK-NEXT:    ldr r1, [r8], #-4
225; CHECK-NEXT:    mls r5, r1, r4, r5
226; CHECK-NEXT:    adds.w r4, r5, #-2147483648
227; CHECK-NEXT:    asr.w r1, r5, #31
228; CHECK-NEXT:    adc r1, r1, #0
229; CHECK-NEXT:    lsrl r4, r1, #2
230; CHECK-NEXT:    rsbs r1, r4, #0
231; CHECK-NEXT:    str r1, [r2]
232; CHECK-NEXT:    str r1, [r6, #-4]
233; CHECK-NEXT:    adds r6, #4
234; CHECK-NEXT:    ldr r1, [sp, #12] @ 4-byte Reload
235; CHECK-NEXT:    adds r1, #4
236; CHECK-NEXT:    le lr, .LBB2_2
237; CHECK-NEXT:  .LBB2_3: @ %while.end
238; CHECK-NEXT:    add sp, #16
239; CHECK-NEXT:    pop.w {r8, r9, r10, r11}
240; CHECK-NEXT:    pop {r4, r5, r6, r7, pc}
241entry:
242  %0 = inttoptr i32 %e to ptr
243  %tobool.not70 = icmp eq i32 %d, 0
244  br i1 %tobool.not70, label %while.end, label %while.body
245
246while.body:                                       ; preds = %entry, %while.body
247  %p.077 = phi ptr [ %incdec.ptr22, %while.body ], [ inttoptr (i32 2 to ptr), %entry ]
248  %c.addr.076 = phi ptr [ %incdec.ptr1, %while.body ], [ %c, %entry ]
249  %n.075 = phi ptr [ %incdec.ptr43, %while.body ], [ %n, %entry ]
250  %m.074 = phi i32 [ %conv35, %while.body ], [ undef, %entry ]
251  %d.addr.073 = phi i32 [ %dec, %while.body ], [ %d, %entry ]
252  %h.072 = phi i32 [ %conv41, %while.body ], [ undef, %entry ]
253  %incdec.ptr43 = getelementptr inbounds i32, ptr %n.075, i32 1
254  %1 = ptrtoint ptr %n.075 to i32
255  %2 = load i32, ptr %incdec.ptr43, align 4
256  %3 = load i32, ptr %c.addr.076, align 4
257  %mul = mul nsw i32 %3, %1
258  %conv = sext i32 %mul to i64
259  %add = add nsw i64 %conv, 2147483648
260  %incdec.ptr1 = getelementptr inbounds i32, ptr %c.addr.076, i32 1
261  %4 = ptrtoint ptr %c.addr.076 to i32
262  %mul2 = mul nsw i32 %2, %4
263  %conv3 = sext i32 %mul2 to i64
264  %add4 = add nsw i64 %conv3, 2147483648
265  %shr = ashr i64 %add, %add4
266  %5 = shl nuw i64 %shr, 32
267  %conv6 = ashr exact i64 %5, 32
268  %conv7 = sext i32 %2 to i64
269  %conv11 = sext i32 %h.072 to i64
270  %6 = load i32, ptr %incdec.ptr1, align 4
271  %mul12 = mul nsw i32 %6, %1
272  %conv13 = sext i32 %mul12 to i64
273  %add14 = add nuw nsw i64 %conv11, 2147483648
274  %add15 = add nsw i64 %add14, %conv13
275  %shr16 = ashr i64 %add15, 32
276  %conv17 = trunc i64 %shr16 to i32
277  %mul8 = shl nsw i64 %conv7, 30
278  %7 = mul i64 %mul8, %conv6
279  %conv18 = ashr i64 %7, 32
280  %sh_prom = zext i32 %2 to i64
281  %shl = shl i64 %conv18, %sh_prom
282  %conv21 = sext i32 %conv17 to i64
283  %incdec.ptr22 = getelementptr inbounds i32, ptr %p.077, i32 -1
284  %8 = load i32, ptr %p.077, align 4
285  %conv23 = sext i32 %8 to i64
286  %conv24 = sext i32 %m.074 to i64
287  %mul25 = mul nsw i64 %conv23, %conv24
288  %sub = sub nsw i64 2147483648, %mul25
289  %add26 = add nsw i64 %sub, %conv21
290  %9 = shl i64 %shl, 30
291  %conv27 = ashr i64 %9, 32
292  %10 = load i32, ptr %incdec.ptr22, align 4
293  %mul28 = mul nsw i32 %10, %m.074
294  %add29 = add nsw i32 %mul28, 2
295  %sh_prom30 = zext i32 %add29 to i64
296  %shl31 = shl i64 %conv27, %sh_prom30
297  %add32 = add nsw i64 %shl31, 2147483648
298  %shr33 = ashr i64 %add26, %add32
299  %11 = lshr i64 %shr33, 2
300  %conv35 = trunc i64 %11 to i32
301  store i32 %conv35, ptr inttoptr (i32 2 to ptr), align 4
302  %12 = load i32, ptr %incdec.ptr22, align 4
303  %mul36 = mul nsw i32 %12, %2
304  %sub37 = sub nsw i32 %conv17, %mul36
305  %conv38 = sext i32 %sub37 to i64
306  %add39 = add nsw i64 %conv38, 2147483648
307  %13 = lshr i64 %add39, 2
308  %conv41 = trunc i64 %13 to i32
309  %sub42 = sub nsw i32 0, %conv41
310  store i32 %sub42, ptr %0, align 4
311  store i32 %sub42, ptr %n.075, align 4
312  %dec = add nsw i32 %d.addr.073, -1
313  %tobool.not = icmp eq i32 %dec, 0
314  br i1 %tobool.not, label %while.end, label %while.body
315
316while.end:                                        ; preds = %while.body, %entry
317  ret i32 undef
318}
319
320declare void @callee()
321define void @callinpreheader(ptr noalias nocapture readonly %pAngle, ptr nocapture %pDst, i32 %size) {
322; CHECK-LABEL: callinpreheader:
323; CHECK:       @ %bb.0: @ %entry
324; CHECK-NEXT:    .save {r4, r5, r6, lr}
325; CHECK-NEXT:    push {r4, r5, r6, lr}
326; CHECK-NEXT:    mov r5, r0
327; CHECK-NEXT:    mov r4, r1
328; CHECK-NEXT:    movs r0, #0
329; CHECK-NEXT:    cbz r2, .LBB3_3
330; CHECK-NEXT:  @ %bb.1: @ %for.body.ph
331; CHECK-NEXT:    mov r6, r2
332; CHECK-NEXT:    bl callee
333; CHECK-NEXT:    dls lr, r6
334; CHECK-NEXT:    movs r0, #0
335; CHECK-NEXT:  .LBB3_2: @ %for.body
336; CHECK-NEXT:    @ =>This Inner Loop Header: Depth=1
337; CHECK-NEXT:    ldr r1, [r5], #4
338; CHECK-NEXT:    add r0, r1
339; CHECK-NEXT:    le lr, .LBB3_2
340; CHECK-NEXT:  .LBB3_3: @ %for.cond.cleanup
341; CHECK-NEXT:    str r0, [r4]
342; CHECK-NEXT:    pop {r4, r5, r6, pc}
343entry:
344  %cmp7.not = icmp eq i32 %size, 0
345  br i1 %cmp7.not, label %for.cond.cleanup, label %for.body.ph
346
347for.body.ph:
348  call void @callee()
349  br label %for.body
350
351for.body:
352  %i.09 = phi i32 [ %inc, %for.body ], [ 0, %for.body.ph ]
353  %s.08 = phi i32 [ %add, %for.body ], [ 0, %for.body.ph ]
354  %arrayidx = getelementptr inbounds i32, ptr %pAngle, i32 %i.09
355  %0 = load i32, ptr %arrayidx, align 4
356  %add = add nsw i32 %0, %s.08
357  %inc = add nuw nsw i32 %i.09, 1
358  %exitcond.not = icmp eq i32 %inc, %size
359  br i1 %exitcond.not, label %for.cond.cleanup, label %for.body
360
361for.cond.cleanup:
362  %s.0.lcssa = phi i32 [ 0, %entry ], [ %add, %for.body ]
363  store i32 %s.0.lcssa, ptr %pDst, align 4
364  ret void
365}
366