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/*
* Copyright (c) 2023 Raspberry Pi (Trading) Ltd.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include "pico/divider.h"
// These functions save/restore divider state, so are safe to call from interrupts
int32_t div_s32s32(int32_t a, int32_t b) {
return hw_divider_quotient_s32(a, b);
}
divmod_result_t divmod_s32s32(int32_t a, int32_t b) {
return hw_divider_divmod_s32(a, b);
}
uint32_t div_u32u32(uint32_t a, uint32_t b) {
return hw_divider_u32_quotient(a, b);
}
divmod_result_t divmod_u32u32(uint32_t a, uint32_t b) {
return hw_divider_divmod_u32(a, b);
}
static inline int __sign_of_64(int64_t v) {
return v > 0 ? 1 : (v < 0 ? -1 : 0);
}
typedef struct {
uint64_t quotient;
uint64_t remainder;
} qr_u64;
typedef struct {
int64_t quotient;
int64_t remainder;
} qr_s64;
// divides unsigned values a by b... (a/b) returned in low 32 bits, (a%b) in high 32 bits... results undefined for b==0
static inline qr_u64 udiv64(uint64_t a, uint64_t b) {
qr_u64 rc;
if (!b) {
rc.quotient = (uint64_t)-1; // todo check this
rc.remainder = a;
} else {
rc.quotient = a/b;
rc.remainder = a%b;
}
return rc;
}
// divides signed values a by b... (a/b) returned in low 32 bits, (a%b) in high 32 bits... results undefined for b==0
static inline qr_s64 div64(int64_t a, int64_t b) {
qr_s64 rc;
if (!b) {
rc.quotient = (uint64_t)(-__sign_of_64(a));
rc.remainder = a;
} else {
rc.quotient = a/b;
rc.remainder = a%b;
}
return rc;
}
int64_t div_s64s64(int64_t a, int64_t b) {
qr_s64 qr = div64(a, b);
return qr.quotient;
}
int64_t divmod_s64s64_rem(int64_t a, int64_t b, int64_t *rem) {
qr_s64 qr = div64(a, b);
*rem = qr.remainder;
return qr.quotient;
}
int64_t divmod_s64s64(int64_t a, int64_t b) {
qr_s64 qr = div64(a, b);
return qr.quotient;
}
uint64_t div_u64u64(uint64_t a, uint64_t b) {
qr_u64 qr = udiv64(a, b);
return qr.quotient;
}
uint64_t divmod_u64u64_rem(uint64_t a, uint64_t b, uint64_t *rem) {
qr_u64 qr = udiv64(a, b);
*rem = qr.remainder;
return qr.quotient;
}
uint64_t divmod_u64u64(uint64_t a, uint64_t b) {
qr_u64 qr = udiv64(a, b);
return qr.quotient;
}
// these functions are slightly faster, but unsafe the divider state, so are not generally safe to be called from interrupts
int32_t div_s32s32_unsafe(int32_t a, int32_t b) { return div_s32s32(a,b); }
int32_t divmod_s32s32_rem_unsafe(int32_t a, int32_t b, int32_t *rem) { return divmod_s32s32_rem(a, b, rem); }
divmod_result_t divmod_s32s32_unsafe(int32_t a, int32_t b) { return divmod_s32s32(a, b); }
uint32_t div_u32u32_unsafe(uint32_t a, uint32_t b) { return div_u32u32(a, b); }
uint32_t divmod_u32u32_rem_unsafe(uint32_t a, uint32_t b, uint32_t *rem) { return divmod_u32u32_rem(a, b, rem); }
divmod_result_t divmod_u32u32_unsafe(uint32_t a, uint32_t b) { return divmod_u32u32(a, b); }
int64_t div_s64s64_unsafe(int64_t a, int64_t b) { return div_s64s64(a, b); }
int64_t divmod_s64s64_rem_unsafe(int64_t a, int64_t b, int64_t *rem) { return divmod_s64s64_rem(a, b, rem); }
// todo this doesn't implement the contract
//int64_t divmod_s64s64_unsafe(int64_t a, int64_t b) { return divmod_s64s64(a, b); }
uint64_t div_u64u64_unsafe(uint64_t a, uint64_t b) { return div_u64u64(a, b); }
uint64_t divmod_u64u64_rem_unsafe(uint64_t a, uint64_t b, uint64_t *rem) { return divmod_u64u64_rem(a, b, rem); }
// todo this doesn't implement the contract
//uint64_t divmod_u64u64_unsafe(uint64_t a, uint64_t b) { return divmod_u64u64(a, b); }
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