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16 lines
388 B
C
16 lines
388 B
C
#include <fp.h>
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/*
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* If ctl == 0x00000000, then *d is set to a0
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* If ctl == 0xFFFFFFFF, then *d is set to a1
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* ctl MUST be either 0x00000000 or 0xFFFFFFFF.
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*/
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void
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fp_select(fp_t *d, const fp_t *a0, const fp_t *a1, uint32_t ctl)
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{
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digit_t cw = (int32_t)ctl;
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for (unsigned int i = 0; i < NWORDS_FIELD; i++) {
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(*d)[i] = (*a0)[i] ^ (cw & ((*a0)[i] ^ (*a1)[i]));
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}
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}
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