1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
/* { dg-do compile } */
/* { dg-require-effective-target bswap } */
/* { dg-require-effective-target stdint_types } */
/* { dg-options "-O2 -fdump-tree-optimized" } */
/* { dg-additional-options "-march=z900" { target s390*-*-* } } */
#include <stdint.h>
#define __const_swab32(x) ((uint32_t)( \
(((uint32_t)(x) & (uint32_t)0x000000ffUL) << 24) | \
(((uint32_t)(x) & (uint32_t)0x0000ff00UL) << 8) | \
(((uint32_t)(x) & (uint32_t)0x00ff0000UL) >> 8) | \
(((uint32_t)(x) & (uint32_t)0xff000000UL) >> 24)))
/* This byte swap implementation is used by the Linux kernel and the
GNU C library. */
uint32_t
swap32_a (uint32_t in)
{
return __const_swab32 (in);
}
/* The OpenSSH byte swap implementation. */
uint32_t
swap32_b (uint32_t in)
{
uint32_t a;
a = (in << 16) | (in >> 16);
a = ((a & 0x00ff00ff) << 8) | ((a & 0xff00ff00) >> 8);
return a;
}
/* This variant is currently used by libgcc. The difference is that
the bswap source and destination have a signed integer type which
requires a slightly higher search depth in order to dive through
the cast as well. */
typedef int SItype __attribute__ ((mode (SI)));
SItype
swap32_c (SItype u)
{
return ((((u) & 0xff000000) >> 24)
| (((u) & 0x00ff0000) >> 8)
| (((u) & 0x0000ff00) << 8)
| (((u) & 0x000000ff) << 24));
}
/* This variant comes from gcc.target/sh/pr53568-1.c. It requires to track
which bytes have an unpredictable value (eg. due to sign extension) to
make sure that the final expression have only well defined byte values. */
SItype
swap32_d (SItype in)
{
/* 1x swap.w
2x swap.b */
return (((in >> 0) & 0xFF) << 24)
| (((in >> 8) & 0xFF) << 16)
| (((in >> 16) & 0xFF) << 8)
| (((in >> 24) & 0xFF) << 0);
}
/* This variant is adapted from swap32_d above. It detects missing cast of
MARKER_BYTE_UNKNOWN to uint64_t for the CASE_CONVERT case for host
architecture where a left shift with too big an operand mask its high
bits. */
SItype
swap32_e (SItype in)
{
return (((in >> 0) & 0xFF) << 24)
| (((in >> 8) & 0xFF) << 16)
| (((((int64_t) in) & 0xFF0000FF0000) >> 16) << 8)
| (((in >> 24) & 0xFF) << 0);
}
/* This variant comes from PR63259. It compiles to a gimple sequence that ends
with a rotation instead of a bitwise OR. */
unsigned
swap32_f (unsigned in)
{
in = ((in & 0xff00ff00) >> 8) | ((in & 0x00ff00ff) << 8);
in = ((in & 0xffff0000) >> 16) | ((in & 0x0000ffff) << 16);
return in;
}
/* { dg-final { scan-tree-dump-times "= __builtin_bswap32 \\\(" 6 "optimized" } } */
|
