1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt < %s -indvars -loop-deletion -simplifycfg -S | FileCheck %s 3 4; Test that we can evaluate the exit values of various expression types. Since 5; these loops all have predictable exit values we can replace the use outside 6; of the loop with a closed-form computation. 7 8define i32 @polynomial_constant() { 9; <label>:0 10; CHECK-LABEL: @polynomial_constant( 11; CHECK-NEXT: Out: 12; CHECK-NEXT: ret i32 500500 13; 14 br label %Loop 15 16Loop: ; preds = %Loop, %0 17 %A1 = phi i32 [ 0, %0 ], [ %A2, %Loop ] ; <i32> [#uses=3] 18 %B1 = phi i32 [ 0, %0 ], [ %B2, %Loop ] ; <i32> [#uses=1] 19 %A2 = add i32 %A1, 1 ; <i32> [#uses=1] 20 %B2 = add i32 %B1, %A1 ; <i32> [#uses=2] 21 %C = icmp eq i32 %A1, 1000 ; <i1> [#uses=1] 22 br i1 %C, label %Out, label %Loop 23 24Out: ; preds = %Loop 25 ret i32 %B2 26} 27 28define i32 @NSquare(i32 %N) { 29; <label>:0 30; CHECK-LABEL: @NSquare( 31; CHECK-NEXT: Out: 32; CHECK-NEXT: [[Y:%.*]] = mul i32 [[N:%.*]], [[N]] 33; CHECK-NEXT: ret i32 [[Y]] 34; 35 br label %Loop 36 37Loop: ; preds = %Loop, %0 38 %X = phi i32 [ 0, %0 ], [ %X2, %Loop ] ; <i32> [#uses=4] 39 %X2 = add i32 %X, 1 ; <i32> [#uses=1] 40 %c = icmp eq i32 %X, %N ; <i1> [#uses=1] 41 br i1 %c, label %Out, label %Loop 42 43Out: ; preds = %Loop 44 %Y = mul i32 %X, %X ; <i32> [#uses=1] 45 ret i32 %Y 46} 47 48define i32 @NSquareOver2(i32 %N) { 49; <label>:0 50; CHECK-LABEL: @NSquareOver2( 51; CHECK-NEXT: Out: 52; CHECK-NEXT: [[TMP0:%.*]] = zext i32 [[N:%.*]] to i33 53; CHECK-NEXT: [[TMP1:%.*]] = add i32 [[N]], -1 54; CHECK-NEXT: [[TMP2:%.*]] = zext i32 [[TMP1]] to i33 55; CHECK-NEXT: [[TMP3:%.*]] = mul i33 [[TMP0]], [[TMP2]] 56; CHECK-NEXT: [[TMP4:%.*]] = lshr i33 [[TMP3]], 1 57; CHECK-NEXT: [[TMP5:%.*]] = trunc i33 [[TMP4]] to i32 58; CHECK-NEXT: [[TMP6:%.*]] = add i32 [[N]], [[TMP5]] 59; CHECK-NEXT: [[TMP7:%.*]] = add i32 [[TMP6]], 15 60; CHECK-NEXT: ret i32 [[TMP7]] 61; 62 br label %Loop 63 64Loop: ; preds = %Loop, %0 65 %X = phi i32 [ 0, %0 ], [ %X2, %Loop ] ; <i32> [#uses=3] 66 %Y = phi i32 [ 15, %0 ], [ %Y2, %Loop ] ; <i32> [#uses=1] 67 %Y2 = add i32 %Y, %X ; <i32> [#uses=2] 68 %X2 = add i32 %X, 1 ; <i32> [#uses=1] 69 %c = icmp eq i32 %X, %N ; <i1> [#uses=1] 70 br i1 %c, label %Out, label %Loop 71 72Out: ; preds = %Loop 73 ret i32 %Y2 74} 75 76define i32 @strength_reduced() { 77; <label>:0 78; CHECK-LABEL: @strength_reduced( 79; CHECK-NEXT: Out: 80; CHECK-NEXT: ret i32 500500 81; 82 br label %Loop 83 84Loop: ; preds = %Loop, %0 85 %A1 = phi i32 [ 0, %0 ], [ %A2, %Loop ] ; <i32> [#uses=3] 86 %B1 = phi i32 [ 0, %0 ], [ %B2, %Loop ] ; <i32> [#uses=1] 87 %A2 = add i32 %A1, 1 ; <i32> [#uses=1] 88 %B2 = add i32 %B1, %A1 ; <i32> [#uses=2] 89 %C = icmp eq i32 %A1, 1000 ; <i1> [#uses=1] 90 br i1 %C, label %Out, label %Loop 91 92Out: ; preds = %Loop 93 ret i32 %B2 94} 95 96define i32 @chrec_equals() { 97; CHECK-LABEL: @chrec_equals( 98; CHECK-NEXT: entry: 99; CHECK-NEXT: ret i32 101 100; 101entry: 102 br label %no_exit 103 104no_exit: ; preds = %no_exit, %entry 105 %i0 = phi i32 [ 0, %entry ], [ %i1, %no_exit ] ; <i32> [#uses=3] 106 %ISq = mul i32 %i0, %i0 ; <i32> [#uses=1] 107 %i1 = add i32 %i0, 1 ; <i32> [#uses=2] 108 %tmp.1 = icmp ne i32 %ISq, 10000 ; <i1> [#uses=1] 109 br i1 %tmp.1, label %no_exit, label %loopexit 110 111loopexit: ; preds = %no_exit 112 ret i32 %i1 113} 114 115define i16 @cast_chrec_test() { 116; <label>:0 117; CHECK-LABEL: @cast_chrec_test( 118; CHECK-NEXT: Out: 119; CHECK-NEXT: ret i16 1000 120; 121 br label %Loop 122 123Loop: ; preds = %Loop, %0 124 %A1 = phi i32 [ 0, %0 ], [ %A2, %Loop ] ; <i32> [#uses=2] 125 %B1 = trunc i32 %A1 to i16 ; <i16> [#uses=2] 126 %A2 = add i32 %A1, 1 ; <i32> [#uses=1] 127 %C = icmp eq i16 %B1, 1000 ; <i1> [#uses=1] 128 br i1 %C, label %Out, label %Loop 129 130Out: ; preds = %Loop 131 ret i16 %B1 132} 133 134define i32 @linear_div_fold() { 135; CHECK-LABEL: @linear_div_fold( 136; CHECK-NEXT: entry: 137; CHECK-NEXT: ret i32 34 138; 139entry: 140 br label %loop 141 142loop: ; preds = %loop, %entry 143 %i = phi i32 [ 4, %entry ], [ %i.next, %loop ] ; <i32> [#uses=3] 144 %i.next = add i32 %i, 8 ; <i32> [#uses=1] 145 %RV = udiv i32 %i, 2 ; <i32> [#uses=1] 146 %c = icmp ne i32 %i, 68 ; <i1> [#uses=1] 147 br i1 %c, label %loop, label %loopexit 148 149loopexit: ; preds = %loop 150 ret i32 %RV 151} 152 153define i32 @unroll_phi_select_constant_nonzero(i32 %arg1, i32 %arg2) { 154; CHECK-LABEL: @unroll_phi_select_constant_nonzero( 155; CHECK-NEXT: entry: 156; CHECK-NEXT: ret i32 [[ARG2:%.*]] 157; 158entry: 159 br label %loop 160 161loop: 162 %i = phi i32 [ 0, %entry ], [ %i.next, %loop ] 163 %selector = phi i32 [%arg1, %entry], [%arg2, %loop] 164 %i.next = add nsw nuw i32 %i, 1 165 %c = icmp ult i32 %i, 4 166 br i1 %c, label %loop, label %loopexit 167 168loopexit: 169 ret i32 %selector 170} 171 172declare i32 @f() 173 174; After LCSSA formation, there's no LCSSA phi for %f since it isn't directly 175; used outside the loop, and thus we can't directly replace %selector w/ %f. 176define i32 @neg_unroll_phi_select_constant_nonzero(i32 %arg) { 177; CHECK-LABEL: @neg_unroll_phi_select_constant_nonzero( 178; CHECK-NEXT: entry: 179; CHECK-NEXT: br label [[LOOP:%.*]] 180; CHECK: loop: 181; CHECK-NEXT: [[I:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[I_NEXT:%.*]], [[LOOP]] ] 182; CHECK-NEXT: [[SELECTOR:%.*]] = phi i32 [ [[ARG:%.*]], [[ENTRY]] ], [ [[F:%.*]], [[LOOP]] ] 183; CHECK-NEXT: [[F]] = call i32 @f() 184; CHECK-NEXT: [[I_NEXT]] = add nuw nsw i32 [[I]], 1 185; CHECK-NEXT: [[C:%.*]] = icmp ult i32 [[I]], 4 186; CHECK-NEXT: br i1 [[C]], label [[LOOP]], label [[LOOPEXIT:%.*]] 187; CHECK: loopexit: 188; CHECK-NEXT: [[SELECTOR_LCSSA:%.*]] = phi i32 [ [[SELECTOR]], [[LOOP]] ] 189; CHECK-NEXT: ret i32 [[SELECTOR_LCSSA]] 190; 191entry: 192 br label %loop 193 194loop: 195 %i = phi i32 [ 0, %entry ], [ %i.next, %loop ] 196 %selector = phi i32 [%arg, %entry], [%f, %loop] 197 %f = call i32 @f() 198 %i.next = add nsw nuw i32 %i, 1 199 %c = icmp ult i32 %i, 4 200 br i1 %c, label %loop, label %loopexit 201 202loopexit: 203 ret i32 %selector 204} 205 206 207define i32 @unroll_phi_select_constant_zero(i32 %arg1, i32 %arg2) { 208; CHECK-LABEL: @unroll_phi_select_constant_zero( 209; CHECK-NEXT: entry: 210; CHECK-NEXT: ret i32 [[ARG1:%.*]] 211; 212entry: 213 br label %loop 214 215loop: 216 %i = phi i32 [ 0, %entry ], [ %i.next, %loop ] 217 %selector = phi i32 [%arg1, %entry], [%arg2, %loop] 218 %i.next = add i32 %i, 1 219 %c = icmp ne i32 %i, 0 220 br i1 %c, label %loop, label %loopexit 221 222loopexit: 223 ret i32 %selector 224} 225 226define i32 @unroll_phi_select(i32 %arg1, i32 %arg2, i16 %len) { 227; CHECK-LABEL: @unroll_phi_select( 228; CHECK-NEXT: entry: 229; CHECK-NEXT: ret i32 [[ARG2:%.*]] 230; 231entry: 232 %length = zext i16 %len to i32 233 br label %loop 234 235loop: 236 %i = phi i32 [ -1, %entry ], [ %i.next, %loop ] 237 %selector = phi i32 [%arg1, %entry], [%arg2, %loop] 238 %i.next = add nsw i32 %i, 1 239 %c = icmp slt i32 %i, %length 240 br i1 %c, label %loop, label %loopexit 241 242loopexit: 243 ret i32 %selector 244} 245 246