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py/misc: Move mp_clz and mp_ctz intrinsics into misc.h.

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Signed-off-by: Angus Gratton <angus@redyak.com.au>
This commit is contained in:
Angus Gratton 2024-04-16 17:07:05 +10:00 committed by Damien George
parent cebc9b0ae2
commit d933210d96
2 changed files with 19 additions and 17 deletions
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18
py/asmthumb.c
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@ -35,23 +35,7 @@
#include "py/mpstate.h"
#include "py/asmthumb.h"
#ifdef _MSC_VER
#include <intrin.h>
static uint32_t mp_clz(uint32_t x) {
unsigned long lz = 0;
return _BitScanReverse(&lz, x) ? (sizeof(x) * 8 - 1) - lz : 0;
}
static uint32_t mp_ctz(uint32_t x) {
unsigned long tz = 0;
return _BitScanForward(&tz, x) ? tz : 0;
}
#else
#define mp_clz(x) __builtin_clz(x)
#define mp_ctz(x) __builtin_ctz(x)
#endif
#include "py/misc.h"
#define UNSIGNED_FIT5(x) ((uint32_t)(x) < 32)
#define UNSIGNED_FIT7(x) ((uint32_t)(x) < 128)

18
py/misc.h
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@ -334,4 +334,22 @@ typedef const char *mp_rom_error_text_t;
// For now, forward directly to MP_COMPRESSED_ROM_TEXT.
#define MP_ERROR_TEXT(x) (mp_rom_error_text_t)MP_COMPRESSED_ROM_TEXT(x)
// Portable implementations of CLZ and CTZ intrinsics
#ifdef _MSC_VER
#include <intrin.h>
static uint32_t mp_clz(uint32_t x) {
unsigned long lz = 0;
return _BitScanReverse(&lz, x) ? (sizeof(x) * 8 - 1) - lz : 0;
}
static uint32_t mp_ctz(uint32_t x) {
unsigned long tz = 0;
return _BitScanForward(&tz, x) ? tz : 0;
}
#else
#define mp_clz(x) __builtin_clz(x)
#define mp_ctz(x) __builtin_ctz(x)
#endif
#endif // MICROPY_INCLUDED_PY_MISC_H