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Simplify fast ARM asm for add/sub

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This commit is contained in:
Ken MacKay
2015-10-12 21:29:57 -07:00
parent c712249e23
commit 1b1f0a6ae0
1 changed files with 8 additions and 8 deletions
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asm_arm.inc
+8 -8
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@@ -51,9 +51,9 @@ uECC_VLI_API uECC_word_t uECC_vli_add(uECC_word_t *result,
wordcount_t num_words) {
#if (uECC_MAX_WORDS != uECC_MIN_WORDS)
#if (uECC_PLATFORM == uECC_arm_thumb) || (uECC_PLATFORM == uECC_arm_thumb2)
uint32_t jump = ((uECC_MAX_WORDS - num_words) * 4 + 5) * 2 + 1;
uint32_t jump = (uECC_MAX_WORDS - num_words) * 4 * 2 + 1;
#else /* ARM */
uint32_t jump = ((uECC_MAX_WORDS - num_words) * 4 + 5) * 4;
uint32_t jump = (uECC_MAX_WORDS - num_words) * 4 * 4;
#endif
#endif
uint32_t carry;
@@ -64,7 +64,7 @@ uECC_VLI_API uECC_word_t uECC_vli_add(uECC_word_t *result,
".syntax unified \n\t"
"movs %[carry], #0 \n\t"
#if (uECC_MAX_WORDS != uECC_MIN_WORDS)
"mov %[left], pc \n\t"
"adr %[left], 1f \n\t"
"adds %[jump], %[left] \n\t"
#endif
@@ -76,7 +76,7 @@ uECC_VLI_API uECC_word_t uECC_vli_add(uECC_word_t *result,
#if (uECC_MAX_WORDS != uECC_MIN_WORDS)
"bx %[jump] \n\t"
#endif
"1: \n\t"
"ldmia %[lptr]!, {%[left]} \n\t"
"ldmia %[rptr]!, {%[right]} \n\t"
"adcs %[left], %[right] \n\t"
@@ -136,9 +136,9 @@ uECC_VLI_API uECC_word_t uECC_vli_sub(uECC_word_t *result,
wordcount_t num_words) {
#if (uECC_MAX_WORDS != uECC_MIN_WORDS)
#if (uECC_PLATFORM == uECC_arm_thumb) || (uECC_PLATFORM == uECC_arm_thumb2)
uint32_t jump = ((uECC_MAX_WORDS - num_words) * 4 + 5) * 2 + 1;
uint32_t jump = (uECC_MAX_WORDS - num_words) * 4 * 2 + 1;
#else /* ARM */
uint32_t jump = ((uECC_MAX_WORDS - num_words) * 4 + 5) * 4;
uint32_t jump = (uECC_MAX_WORDS - num_words) * 4 * 4;
#endif
#endif
uint32_t carry;
@@ -149,7 +149,7 @@ uECC_VLI_API uECC_word_t uECC_vli_sub(uECC_word_t *result,
".syntax unified \n\t"
"movs %[carry], #0 \n\t"
#if (uECC_MAX_WORDS != uECC_MIN_WORDS)
"mov %[left], pc \n\t"
"adr %[left], 1f \n\t"
"adds %[jump], %[left] \n\t"
#endif
@@ -161,7 +161,7 @@ uECC_VLI_API uECC_word_t uECC_vli_sub(uECC_word_t *result,
#if (uECC_MAX_WORDS != uECC_MIN_WORDS)
"bx %[jump] \n\t"
#endif
"1: \n\t"
"ldmia %[lptr]!, {%[left]} \n\t"
"ldmia %[rptr]!, {%[right]} \n\t"
"sbcs %[left], %[right] \n\t"