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114 lines
3.4 KiB
C
114 lines
3.4 KiB
C
/*
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* Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include "pico/divider.h"
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// These functions save/restore divider state, so are safe to call from interrupts
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int32_t div_s32s32(int32_t a, int32_t b) {
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return hw_divider_quotient_s32(a, b);
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}
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divmod_result_t divmod_s32s32(int32_t a, int32_t b) {
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return hw_divider_divmod_s32(a, b);
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}
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uint32_t div_u32u32(uint32_t a, uint32_t b) {
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return hw_divider_u32_quotient(a, b);
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}
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divmod_result_t divmod_u32u32(uint32_t a, uint32_t b) {
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return hw_divider_divmod_u32(a, b);
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}
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static inline int __sign_of_64(int32_t v) {
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return v > 0 ? 1 : (v < 0 ? -1 : 0);
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}
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typedef struct {
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uint64_t quotient;
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uint64_t remainder;
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} qr_u64;
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typedef struct {
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int64_t quotient;
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int64_t remainder;
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} qr_s64;
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// divides unsigned values a by b... (a/b) returned in low 32 bits, (a%b) in high 32 bits... results undefined for b==0
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static inline qr_u64 udiv64(uint64_t a, uint64_t b) {
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qr_u64 rc;
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if (!b) {
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rc.quotient = (uint64_t)-1; // todo check this
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rc.remainder = a;
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} else {
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rc.quotient = a/b;
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rc.remainder = a%b;
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}
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return rc;
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}
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// divides signed values a by b... (a/b) returned in low 32 bits, (a%b) in high 32 bits... results undefined for b==0
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static inline qr_s64 div64(int64_t a, int64_t b) {
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qr_s64 rc;
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if (!b) {
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rc.quotient = (uint64_t)(-__sign_of_64(a));
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rc.remainder = a;
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} else {
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rc.quotient = a/b;
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rc.remainder = a%b;
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}
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return rc;
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}
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int64_t div_s64s64(int64_t a, int64_t b) {
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qr_s64 qr = div64(a, b);
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return qr.quotient;
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}
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int64_t divmod_s64s64_rem(int64_t a, int64_t b, int64_t *rem) {
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qr_s64 qr = div64(a, b);
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*rem = qr.remainder;
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return qr.quotient;
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}
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int64_t divmod_s64s64(int64_t a, int64_t b) {
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qr_s64 qr = div64(a, b);
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return qr.quotient;
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}
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uint64_t div_u64u64(uint64_t a, uint64_t b) {
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qr_u64 qr = udiv64(a, b);
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return qr.quotient;
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}
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uint64_t divmod_u64u64_rem(uint64_t a, uint64_t b, uint64_t *rem) {
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qr_u64 qr = udiv64(a, b);
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*rem = qr.remainder;
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return qr.quotient;
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}
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uint64_t divmod_u64u64(uint64_t a, uint64_t b) {
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qr_u64 qr = udiv64(a, b);
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return qr.quotient;
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}
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// these functions are slightly faster, but unsafe the divider state, so are not generally safe to be called from interrupts
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int32_t div_s32s32_unsafe(int32_t a, int32_t b) { return div_s32s32(a,b); }
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int32_t divmod_s32s32_rem_unsafe(int32_t a, int32_t b, int32_t *rem) { return divmod_s32s32_rem(a, b, rem); }
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divmod_result_t divmod_s32s32_unsafe(int32_t a, int32_t b) { return divmod_s32s32(a, b); }
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uint32_t div_u32u32_unsafe(uint32_t a, uint32_t b) { return div_u32u32(a, b); }
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uint32_t divmod_u32u32_rem_unsafe(uint32_t a, uint32_t b, uint32_t *rem) { return divmod_u32u32_rem(a, b, rem); }
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uint64_t divmod_u32u32_unsafe(uint32_t a, uint32_t b) { return divmod_u32u32(a, b); }
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int64_t div_s64s64_unsafe(int64_t a, int64_t b) { return div_s64s64(a, b); }
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int64_t divmod_s64s64_rem_unsafe(int64_t a, int64_t b, int64_t *rem) { return divmod_s64s64_rem(a, b, rem); }
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int64_t divmod_s64s64_unsafe(int64_t a, int64_t b) { return divmod_s64s64(a, b); }
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uint64_t div_u64u64_unsafe(uint64_t a, uint64_t b) { return div_u64u64(a, b); }
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uint64_t divmod_u64u64_rem_unsafe(uint64_t a, uint64_t b, uint64_t *rem) { return divmod_u64u64_rem(a, b, rem); }
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uint64_t divmod_u64u64_unsafe(uint64_t a, uint64_t b) { return divmod_u64u64(a, b); }
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