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| author | Luc Van Oostenryck <luc.vanoostenryck@gmail.com> | 2017-06-19 22:47:24 +0200 |
|---|---|---|
| committer | Luc Van Oostenryck <luc.vanoostenryck@gmail.com> | 2017-06-21 11:28:40 +0200 |
| commit | 657ea654866b18a368b220bba272b17369b78fe4 (patch) | |
| tree | 501c1985a94b8912bad8dcf752d304629b1cce34 | |
| parent | 852801f8b966407544326cd1c485f9bc7681a2e6 (diff) | |
| download | sparse-dev-657ea654866b18a368b220bba272b17369b78fe4.tar.gz | |
add fallback for missing __builtin_bswapXX()
Older version of GCC (or clang) or some other compilers
doesn't support the __builtin_bswap{16,32,64)().
Provides a fallback for them.
Note: this patch allow the testsuite to run successfully on openbsd
(its installed compiler is based on GCC 4.2).
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
| -rw-r--r-- | builtin.c | 7 | ||||
| -rw-r--r-- | compat/bswap.h | 54 |
2 files changed, 58 insertions, 3 deletions
@@ -26,6 +26,7 @@ #include "expression.h" #include "expand.h" #include "symbol.h" +#include "compat/bswap.h" static int evaluate_to_integer(struct expression *expr) { @@ -187,9 +188,9 @@ static int expand_bswap(struct expression *expr, int cost) /* the arguments number & type have already been checked */ val = const_expression_value(first_expression(expr->args)); switch (expr->ctype->bit_size) { - case 16: expr->value = __builtin_bswap16(val); break; - case 32: expr->value = __builtin_bswap32(val); break; - case 64: expr->value = __builtin_bswap64(val); break; + case 16: expr->value = bswap16(val); break; + case 32: expr->value = bswap32(val); break; + case 64: expr->value = bswap64(val); break; default: /* impossible error */ return SIDE_EFFECTS; } diff --git a/compat/bswap.h b/compat/bswap.h new file mode 100644 index 00000000..f0b7e93c --- /dev/null +++ b/compat/bswap.h @@ -0,0 +1,54 @@ +#ifndef _COMPAT_BSWAP_H_ +#define _COMPAT_BSWAP_H_ + +#if defined(__GNUC__) +#if (__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 8)) +#define __HAS_BUILTIN_BSWAP16 +#endif +#if (__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 4)) +#define __HAS_BUILTIN_BSWAP32 +#define __HAS_BUILTIN_BSWAP64 +#endif +#endif + +#if defined(__clang__) +#if (__clang_major__ > 3) || ((__clang_major__ == 3) && (__clang_minor__ >= 2)) +#define __HAS_BUILTIN_BSWAP16 +#endif +#if (__clang_major__ > 3) || ((__clang_major__ == 3) && (__clang_minor__ >= 0)) +#define __HAS_BUILTIN_BSWAP32 +#define __HAS_BUILTIN_BSWAP64 +#endif +#endif + +#ifdef __HAS_BUILTIN_BSWAP16 +#define bswap16(x) __builtin_bswap16(x) +#else +#include <stdint.h> +static inline uint16_t bswap16(uint16_t x) +{ + return x << 8 | x >> 8; +} +#endif + +#ifdef __HAS_BUILTIN_BSWAP32 +#define bswap32(x) __builtin_bswap32(x) +#else +#include <stdint.h> +static inline uint32_t bswap32(uint32_t x) +{ + return x >> 24 | (x >> 8 & 0xff00) | (x << 8 & 0xff0000) | x << 24; +} +#endif + +#ifdef __HAS_BUILTIN_BSWAP64 +#define bswap64(x) __builtin_bswap64(x) +#else +#include <stdint.h> +static inline uint64_t bswap64(uint64_t x) +{ + return ((uint64_t)bswap32(x)) << 32 | bswap32(x >> 32); +} +#endif + +#endif |