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Add fast square asm for AVR (#50)

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This commit is contained in:
Ken MacKay
2016-01-12 21:22:01 -08:00
parent 7db3158822
commit 467c49e7cf
2 changed files with 2378 additions and 381 deletions
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asm_avr.inc
+57 -4
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@@ -250,17 +250,70 @@ uECC_VLI_API void uECC_vli_mult(uECC_word_t *result,
FAST_MULT_ASM_32
"pop r18 \n\t"
#endif
"done: \n\t"
"2: \n\t"
"eor r1, r1 \n\t"
: "+x" (left), "+y" (right), "+z" (result)
: "r" (r18)
: "r0", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10",
"r11", "r12", "r13", "r14", "r15", "r16", "r17", "r19", "r20",
"r21", "r22", "r23", "r24", "r25", "cc", "memory"
"r21", "r22", "r23", "r24", "r25", "cc"
);
}
#define asm_mult 1
#if uECC_SQUARE_FUNC
__attribute((noinline))
uECC_VLI_API void uECC_vli_square(uECC_word_t *result,
const uECC_word_t *left,
wordcount_t num_words) {
/* num_words should already be in r20. */
register wordcount_t r20 __asm__("r20") = num_words;
__asm__ volatile (
"push r20 \n\t"
#if (uECC_MIN_WORDS == 20)
FAST_SQUARE_ASM_20
"pop r20 \n\t"
#if (uECC_MAX_WORDS > 20)
FAST_SQUARE_ASM_20_TO_24
#endif
#if (uECC_MAX_WORDS > 24)
FAST_SQUARE_ASM_24_TO_28
#endif
#if (uECC_MAX_WORDS > 28)
FAST_SQUARE_ASM_28_TO_32
#endif
#elif (uECC_MIN_WORDS == 24)
FAST_SQUARE_ASM_24
"pop r20 \n\t"
#if (uECC_MAX_WORDS > 24)
FAST_SQUARE_ASM_24_TO_28
#endif
#if (uECC_MAX_WORDS > 28)
FAST_SQUARE_ASM_28_TO_32
#endif
#elif (uECC_MIN_WORDS == 28)
FAST_SQUARE_ASM_28
"pop r20 \n\t"
#if (uECC_MAX_WORDS > 28)
FAST_SQUARE_ASM_28_TO_32
#endif
#elif (uECC_MIN_WORDS == 32)
FAST_SQUARE_ASM_32
"pop r20 \n\t"
#endif
"2: \n\t"
"eor r1, r1 \n\t"
: "+x" (left), "+z" (result)
: "r" (r20)
: "r0", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10",
"r11", "r12", "r13", "r14", "r15", "r16", "r17", "r18", "r19",
"r21", "r22", "r23", "r24", "r25", "r28", "r29", "cc"
);
}
#define asm_square 1
#endif /* uECC_SQUARE_FUNC */
#endif /* (uECC_OPTIMIZATION_LEVEL >= 3) */
#if uECC_SUPPORTS_secp160r1
@@ -434,7 +487,7 @@ static void vli_mmod_fast_secp160r1(uECC_word_t *result, uECC_word_t *product) {
: "+x" (product), [carry] "+r" (carry)
: "y" (result)
: "r0", "r18", "r19", "r30", "r31", "cc", "memory"
: "r0", "r18", "r19", "r30", "r31", "cc"
);
if (carry > 0) {
@@ -759,7 +812,7 @@ static void vli_mmod_fast_secp256k1(uECC_word_t *result, uECC_word_t *product) {
: "+x" (product), [carry] "+r" (carry)
: "y" (result)
: "r0", "r18", "r19", "r20", "r21", "r22", "r23", "r24", "r25", "r30", "r31", "cc", "memory"
: "r0", "r18", "r19", "r20", "r21", "r22", "r23", "r24", "r25", "r30", "r31", "cc"
);
if (carry > 0) {
asm_avr_mult_square.inc
+2319 -375
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