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bitops.h: Provide hswap32(), hswap64(), wswap64() swapping operations 

Currently the ARM SVE helper code defines locally some utility
functions for swapping 16-bit halfwords within 32-bit or 64-bit
values and for swapping 32-bit words within 64-bit values,
parallel to the byte-swapping bswap16/32/64 functions.

We want these also for the ARM MVE code, and they're potentially
generally useful for other targets, so move them to bitops.h.
(We don't put them in bswap.h with the bswap* functions because
they are implemented in terms of the rotate operations also
defined in bitops.h, and including bitops.h from bswap.h seems
better avoided.)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20210614151007.4545-17-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2021-06-14 16:09:26 +01:00
parent 77f96148f3
commit dbcf6f9367
2 changed files with 29 additions and 20 deletions
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29
include/qemu/bitops.h
View File

@ -291,6 +291,35 @@ static inline uint64_t ror64(uint64_t word, unsigned int shift)
return (word >> shift) | (word << ((64 - shift) & 63));
}
/**
* hswap32 - swap 16-bit halfwords within a 32-bit value
* @h: value to swap
*/
static inline uint32_t hswap32(uint32_t h)
{
return rol32(h, 16);
}
/**
* hswap64 - swap 16-bit halfwords within a 64-bit value
* @h: value to swap
*/
static inline uint64_t hswap64(uint64_t h)
{
uint64_t m = 0x0000ffff0000ffffull;
h = rol64(h, 32);
return ((h & m) << 16) | ((h >> 16) & m);
}
/**
* wswap64 - swap 32-bit words within a 64-bit value
* @h: value to swap
*/
static inline uint64_t wswap64(uint64_t h)
{
return rol64(h, 32);
}
/**
* extract32:
* @value: the value to extract the bit field from

20
target/arm/sve_helper.c
View File

@ -152,26 +152,6 @@ static inline uint64_t expand_pred_s(uint8_t byte)
return word[byte & 0x11];
}
/* Swap 16-bit words within a 32-bit word. */
static inline uint32_t hswap32(uint32_t h)
{
return rol32(h, 16);
}
/* Swap 16-bit words within a 64-bit word. */
static inline uint64_t hswap64(uint64_t h)
{
uint64_t m = 0x0000ffff0000ffffull;
h = rol64(h, 32);
return ((h & m) << 16) | ((h >> 16) & m);
}
/* Swap 32-bit words within a 64-bit word. */
static inline uint64_t wswap64(uint64_t h)
{
return rol64(h, 32);
}
#define LOGICAL_PPPP(NAME, FUNC) \
void HELPER(NAME)(void *vd, void *vn, void *vm, void *vg, uint32_t desc) \
{ \