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comparison gcc/testsuite/gcc.dg/vect/vect-over-widen-9.c @ 131:84e7813d76e9

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gcc-8.2
author mir3636
date Thu, 25 Oct 2018 07:37:49 +0900
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111:04ced10e8804 131:84e7813d76e9
1 /* { dg-require-effective-target vect_int } */
2 /* { dg-require-effective-target vect_shift } */
3 /* { dg-require-effective-target vect_pack_trunc } */
4 /* { dg-require-effective-target vect_unpack } */
5
6 #include "tree-vect.h"
7
8 #ifndef SIGNEDNESS
9 #define SIGNEDNESS signed
10 #define BASE_B -128
11 #define BASE_C -100
12 #endif
13
14 #define N 50
15
16 /* Both range analysis and backward propagation from the truncation show
17 that these calculations can be done in SIGNEDNESS short. */
18 void __attribute__ ((noipa))
19 f (SIGNEDNESS char *restrict a, SIGNEDNESS char *restrict b,
20 SIGNEDNESS char *restrict c)
21 {
22 for (int i = 0; i < N; ++i)
23 {
24 /* Deliberate use of signed >>. */
25 int res = b[i] + c[i];
26 a[i] = (res + (res >> 1)) >> 2;
27 }
28 }
29
30 int
31 main (void)
32 {
33 check_vect ();
34
35 SIGNEDNESS char a[N], b[N], c[N];
36 for (int i = 0; i < N; ++i)
37 {
38 b[i] = BASE_B + i * 5;
39 c[i] = BASE_C + i * 4;
40 asm volatile ("" ::: "memory");
41 }
42 f (a, b, c);
43 for (int i = 0; i < N; ++i)
44 {
45 int res = BASE_B + BASE_C + i * 9;
46 if (a[i] != ((res + (res >> 1)) >> 2))
47 __builtin_abort ();
48 }
49
50 return 0;
51 }
52
53 /* { dg-final { scan-tree-dump {Splitting statement} "vect" } } */
54 /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* \+ } "vect" } } */
55 /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* >> 1} "vect" } } */
56 /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* >> 2} "vect" } } */
57 /* { dg-final { scan-tree-dump {vect_recog_cast_forwprop_pattern: detected:[^\n]* \(signed char\)} "vect" } } */
58 /* { dg-final { scan-tree-dump-not {vector[^ ]* int} "vect" } } */
59 /* { dg-final { scan-tree-dump-times "vectorized 1 loop" 1 "vect" } } */