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Create byteorder header for host_to_le functions

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Patryk Obara 2020-04-14 19:33:55 +02:00 • committed by Patryk Obara
parent 52fd4ed2d0
commit c05bbafb5d
6 changed files with 133 additions and 46 deletions
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45
include/mem.h
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@ -23,6 +23,8 @@
#include "dosbox.h"
#endif
#include "byteorder.h"
typedef Bit32u PhysPt;
typedef Bit8u * HostPt;
typedef Bit32u RealPt;
@ -118,49 +120,6 @@ static INLINE void host_writed(HostPt off,Bit32u val) {
#endif
// host_to_le functions allow for byte order conversion on big endian
// architectures while respecting memory alignment on low endian.
//
// It is extremely unlikely that we'll ever try to compile on big endian arch
// with a compiler missing __builtin_bswap*, so let's not overcomplicate
// things.
//
// __builtin_bswap* is supported since GCC 4.3 and Clang 3.4
constexpr static INLINE uint8_t host_to_le(uint8_t val) {
return val;
}
#if defined(WORDS_BIGENDIAN)
constexpr static INLINE int16_t host_to_le(int16_t val) {
return __builtin_bswap16(val);
}
constexpr static INLINE uint16_t host_to_le(uint16_t val) {
return __builtin_bswap16(val);
}
constexpr static INLINE uint32_t host_to_le(uint32_t val) {
return __builtin_bswap32(val);
}
#else
constexpr static INLINE int16_t host_to_le(int16_t val) {
return val;
}
constexpr static INLINE uint16_t host_to_le(uint16_t val) {
return val;
}
constexpr static INLINE uint32_t host_to_le(uint32_t val) {
return val;
}
#endif
static INLINE void var_write(Bit8u * var, Bit8u val) {
host_writeb(var, val);
}