@@ -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;
}
new file mode 100644
@@ -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
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> --- builtin.c | 7 ++++--- compat/bswap.h | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 58 insertions(+), 3 deletions(-) create mode 100644 compat/bswap.h