1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2 ; RUN: opt -loop-unroll -mtriple=thumbv7a-unknown-linux-gnueabihf -S %s | FileCheck %s
4 ; Check we unroll even with optsize, if the result is smaller, either because
5 ; we have single iteration loops or bodies with constant folding opportunities
6 ; after fully unrolling.
8 ; TODO: Looks like we should enable some unrolling for M-class, even when
13 define void @fully_unrolled_single_iteration(i32* %src) #0 {
14 ; CHECK-LABEL: @fully_unrolled_single_iteration(
16 ; CHECK-NEXT: [[ARR:%.*]] = alloca [4 x i32], align 4
17 ; CHECK-NEXT: br label [[FOR_BODY:%.*]]
19 ; CHECK-NEXT: [[V:%.*]] = load i32, i32* [[SRC:%.*]]
20 ; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [4 x i32], [4 x i32]* [[ARR]], i64 0, i64 0
21 ; CHECK-NEXT: store i32 [[V]], i32* [[ARRAYIDX]], align 4
22 ; CHECK-NEXT: [[PTR:%.*]] = bitcast [4 x i32]* [[ARR]] to i32*
23 ; CHECK-NEXT: call void @use(i32* nonnull [[PTR]])
24 ; CHECK-NEXT: ret void
27 %arr = alloca [4 x i32], align 4
30 for.body: ; preds = %for.body, %entry
31 %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
32 %src.idx = getelementptr inbounds i32, i32* %src, i64 %indvars.iv
33 %v = load i32, i32* %src.idx
34 %arrayidx = getelementptr inbounds [4 x i32], [4 x i32]* %arr, i64 0, i64 %indvars.iv
35 store i32 %v, i32* %arrayidx, align 4
36 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
37 %exitcond = icmp eq i64 %indvars.iv.next, 1
38 br i1 %exitcond, label %for.cond.cleanup, label %for.body
40 for.cond.cleanup: ; preds = %for.cond
41 %ptr = bitcast [4 x i32]* %arr to i32*
42 call void @use(i32* nonnull %ptr) #4
47 define void @fully_unrolled_smaller() #0 {
48 ; CHECK-LABEL: @fully_unrolled_smaller(
50 ; CHECK-NEXT: [[ARR:%.*]] = alloca [4 x i32], align 4
51 ; CHECK-NEXT: br label [[FOR_BODY:%.*]]
53 ; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [4 x i32], [4 x i32]* [[ARR]], i64 0, i64 0
54 ; CHECK-NEXT: store i32 16, i32* [[ARRAYIDX]], align 4
55 ; CHECK-NEXT: [[ARRAYIDX_1:%.*]] = getelementptr inbounds [4 x i32], [4 x i32]* [[ARR]], i64 0, i64 1
56 ; CHECK-NEXT: store i32 4104, i32* [[ARRAYIDX_1]], align 4
57 ; CHECK-NEXT: [[ARRAYIDX_2:%.*]] = getelementptr inbounds [4 x i32], [4 x i32]* [[ARR]], i64 0, i64 2
58 ; CHECK-NEXT: store i32 1048592, i32* [[ARRAYIDX_2]], align 4
59 ; CHECK-NEXT: [[ARRAYIDX_3:%.*]] = getelementptr inbounds [4 x i32], [4 x i32]* [[ARR]], i64 0, i64 3
60 ; CHECK-NEXT: store i32 268435480, i32* [[ARRAYIDX_3]], align 4
61 ; CHECK-NEXT: [[PTR:%.*]] = bitcast [4 x i32]* [[ARR]] to i32*
62 ; CHECK-NEXT: call void @use(i32* nonnull [[PTR]])
63 ; CHECK-NEXT: ret void
66 %arr = alloca [4 x i32], align 4
69 for.body: ; preds = %for.body, %entry
70 %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
71 %indvars.iv.tr = trunc i64 %indvars.iv to i32
72 %shl.0 = shl i32 %indvars.iv.tr, 3
73 %shl.1 = shl i32 16, %shl.0
74 %or = or i32 %shl.1, %shl.0
75 %arrayidx = getelementptr inbounds [4 x i32], [4 x i32]* %arr, i64 0, i64 %indvars.iv
76 store i32 %or, i32* %arrayidx, align 4
77 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
78 %exitcond = icmp eq i64 %indvars.iv, 3
79 br i1 %exitcond, label %for.cond.cleanup, label %for.body
81 for.cond.cleanup: ; preds = %for.cond
82 %ptr = bitcast [4 x i32]* %arr to i32*
83 call void @use(i32* nonnull %ptr) #4
87 define void @fully_unrolled_smaller_Oz() #1 {
88 ; CHECK-LABEL: @fully_unrolled_smaller_Oz(
90 ; CHECK-NEXT: [[ARR:%.*]] = alloca [4 x i32], align 4
91 ; CHECK-NEXT: br label [[FOR_BODY:%.*]]
93 ; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [4 x i32], [4 x i32]* [[ARR]], i64 0, i64 0
94 ; CHECK-NEXT: store i32 16, i32* [[ARRAYIDX]], align 4
95 ; CHECK-NEXT: [[ARRAYIDX_1:%.*]] = getelementptr inbounds [4 x i32], [4 x i32]* [[ARR]], i64 0, i64 1
96 ; CHECK-NEXT: store i32 4104, i32* [[ARRAYIDX_1]], align 4
97 ; CHECK-NEXT: [[ARRAYIDX_2:%.*]] = getelementptr inbounds [4 x i32], [4 x i32]* [[ARR]], i64 0, i64 2
98 ; CHECK-NEXT: store i32 1048592, i32* [[ARRAYIDX_2]], align 4
99 ; CHECK-NEXT: [[ARRAYIDX_3:%.*]] = getelementptr inbounds [4 x i32], [4 x i32]* [[ARR]], i64 0, i64 3
100 ; CHECK-NEXT: store i32 268435480, i32* [[ARRAYIDX_3]], align 4
101 ; CHECK-NEXT: [[PTR:%.*]] = bitcast [4 x i32]* [[ARR]] to i32*
102 ; CHECK-NEXT: call void @use(i32* nonnull [[PTR]])
103 ; CHECK-NEXT: ret void
106 %arr = alloca [4 x i32], align 4
109 for.body: ; preds = %for.body, %entry
110 %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
111 %indvars.iv.tr = trunc i64 %indvars.iv to i32
112 %shl.0 = shl i32 %indvars.iv.tr, 3
113 %shl.1 = shl i32 16, %shl.0
114 %or = or i32 %shl.1, %shl.0
115 %arrayidx = getelementptr inbounds [4 x i32], [4 x i32]* %arr, i64 0, i64 %indvars.iv
116 store i32 %or, i32* %arrayidx, align 4
117 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
118 %exitcond = icmp eq i64 %indvars.iv, 3
119 br i1 %exitcond, label %for.cond.cleanup, label %for.body
121 for.cond.cleanup: ; preds = %for.cond
122 %ptr = bitcast [4 x i32]* %arr to i32*
123 call void @use(i32* nonnull %ptr) #4
128 define void @fully_unrolled_bigger() #0 {
129 ; CHECK-LABEL: @fully_unrolled_bigger(
131 ; CHECK-NEXT: [[ARR:%.*]] = alloca [4 x i32], align 4
132 ; CHECK-NEXT: br label [[FOR_BODY:%.*]]
134 ; CHECK-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ], [ 0, [[ENTRY:%.*]] ]
135 ; CHECK-NEXT: [[INDVARS_IV_TR:%.*]] = trunc i64 [[INDVARS_IV]] to i32
136 ; CHECK-NEXT: [[SHL_0:%.*]] = shl i32 [[INDVARS_IV_TR]], 3
137 ; CHECK-NEXT: [[SHL_1:%.*]] = shl i32 16, [[SHL_0]]
138 ; CHECK-NEXT: [[OR:%.*]] = or i32 [[SHL_1]], [[SHL_0]]
139 ; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [4 x i32], [4 x i32]* [[ARR]], i64 0, i64 [[INDVARS_IV]]
140 ; CHECK-NEXT: store i32 [[OR]], i32* [[ARRAYIDX]], align 4
141 ; CHECK-NEXT: [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]], 1
142 ; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[INDVARS_IV]], 7
143 ; CHECK-NEXT: br i1 [[EXITCOND]], label [[FOR_COND_CLEANUP:%.*]], label [[FOR_BODY]]
144 ; CHECK: for.cond.cleanup:
145 ; CHECK-NEXT: [[PTR:%.*]] = bitcast [4 x i32]* [[ARR]] to i32*
146 ; CHECK-NEXT: call void @use(i32* nonnull [[PTR]])
147 ; CHECK-NEXT: ret void
150 %arr = alloca [4 x i32], align 4
153 for.body: ; preds = %for.body, %entry
154 %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
155 %indvars.iv.tr = trunc i64 %indvars.iv to i32
156 %shl.0 = shl i32 %indvars.iv.tr, 3
157 %shl.1 = shl i32 16, %shl.0
158 %or = or i32 %shl.1, %shl.0
159 %arrayidx = getelementptr inbounds [4 x i32], [4 x i32]* %arr, i64 0, i64 %indvars.iv
160 store i32 %or, i32* %arrayidx, align 4
161 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
162 %exitcond = icmp eq i64 %indvars.iv, 7
163 br i1 %exitcond, label %for.cond.cleanup, label %for.body
165 for.cond.cleanup: ; preds = %for.cond
166 %ptr = bitcast [4 x i32]* %arr to i32*
167 call void @use(i32* nonnull %ptr) #4
171 declare void @use(i32*)
173 attributes #0 = { optsize }
174 attributes #1 = { minsize optsize }