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131
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1 /* { dg-require-effective-target vect_int } */
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2 /* { dg-require-effective-target vect_shift } */
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3 /* { dg-require-effective-target vect_pack_trunc } */
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4 /* { dg-require-effective-target vect_unpack } */
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5
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6 #include "tree-vect.h"
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7
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8 #ifndef SIGNEDNESS
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9 #define SIGNEDNESS signed
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10 #define BASE_B -128
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11 #define BASE_C -100
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12 #endif
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13
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14 #define N 50
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15
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16 /* Both range analysis and backward propagation from the truncation show
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17 that these calculations can be done in SIGNEDNESS short. */
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18 void __attribute__ ((noipa))
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19 f (SIGNEDNESS char *restrict a, SIGNEDNESS char *restrict b,
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20 SIGNEDNESS char *restrict c)
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21 {
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22 /* Deliberate use of signed >>. */
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23 for (int i = 0; i < N; ++i)
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24 a[i] = (b[i] + c[i]) >> 1;
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25 }
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26
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27 int
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28 main (void)
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29 {
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30 check_vect ();
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31
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32 SIGNEDNESS char a[N], b[N], c[N];
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33 for (int i = 0; i < N; ++i)
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34 {
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35 b[i] = BASE_B + i * 5;
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36 c[i] = BASE_C + i * 4;
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37 asm volatile ("" ::: "memory");
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38 }
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39 f (a, b, c);
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40 for (int i = 0; i < N; ++i)
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41 if (a[i] != (BASE_B + BASE_C + i * 9) >> 1)
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42 __builtin_abort ();
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43
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44 return 0;
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45 }
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46
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47 /* { dg-final { scan-tree-dump {Splitting statement} "vect" } } */
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48 /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* \+ } "vect" } } */
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49 /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* >> 1} "vect" } } */
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50 /* { dg-final { scan-tree-dump {vect_recog_cast_forwprop_pattern: detected:[^\n]* \(signed char\)} "vect" } } */
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51 /* { dg-final { scan-tree-dump-not {vector[^ ]* int} "vect" } } */
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52 /* { dg-final { scan-tree-dump-times "vectorized 1 loop" 1 "vect" } } */
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