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comparison gcc/testsuite/gcc.dg/optimize-bswaphi-1.c @ 111:04ced10e8804

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gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
parents
children 84e7813d76e9
comparison
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68:561a7518be6b 111:04ced10e8804
1 /* { dg-do compile } */
2 /* { dg-require-effective-target bswap16 } */
3 /* { dg-require-effective-target stdint_types } */
4 /* { dg-options "-O2 -fdump-tree-bswap" } */
5 /* { dg-additional-options "-march=z900" { target s390-*-* } } */
6
7 #include <stdint.h>
8
9 unsigned char data[2];
10
11 struct uint16_st {
12 unsigned char u0, u1;
13 };
14
15 uint32_t read_le16_1 (void)
16 {
17 return data[0] | (data[1] << 8);
18 }
19
20 uint32_t read_le16_2 (struct uint16_st data)
21 {
22 return data.u0 | (data.u1 << 8);
23 }
24
25 uint32_t read_le16_3 (unsigned char *data)
26 {
27 return *data | (*(data + 1) << 8);
28 }
29
30 uint32_t read_be16_1 (void)
31 {
32 return data[1] | (data[0] << 8);
33 }
34
35 uint32_t read_be16_2 (struct uint16_st data)
36 {
37 return data.u1 | (data.u0 << 8);
38 }
39
40 uint32_t read_be16_3 (unsigned char *data)
41 {
42 return *(data + 1) | (*data << 8);
43 }
44
45 typedef int HItype __attribute__ ((mode (HI)));
46
47 /* Test that detection of significant sign extension works correctly. This
48 checks that unknown byte markers are set correctly in cast of cast. */
49
50 HItype
51 swap16 (HItype in)
52 {
53 return (HItype) (((in >> 0) & 0xFF) << 8)
54 | (((in >> 8) & 0xFF) << 0);
55 }
56
57 /* { dg-final { scan-tree-dump-times "16 bit load in target endianness found at" 3 "bswap" } } */
58 /* { dg-final { scan-tree-dump-times "16 bit bswap implementation found at" 4 "bswap" } } */