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Fix Thumb-1 assembly
This commit is contained in:
Ken MacKay
+140
-130
@@ -985,95 +985,99 @@ uECC_VLI_API void uECC_vli_mult(uECC_word_t *result,
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);
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#else /* Thumb-1 */
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uint32_t r4, r5, r6, r7;
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register uint32_t *r0 __asm__("r0") = result;
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register const uint32_t *r1 __asm__("r1") = left;
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register const uint32_t *r2 __asm__("r2") = right;
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__asm__ volatile (
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".syntax unified \n\t"
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"movs r3, #0 \n\t" /* c0 = 0 */
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"movs r4, #0 \n\t" /* c1 = 0 */
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"movs r5, #0 \n\t" /* c2 = 0 */
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"movs r6, #0 \n\t" /* k = 0 */
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"subs %[r3], #1 \n\t" /* r3 = num_words - 1 */
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"lsls %[r3], #2 \n\t" /* r3 = (num_words - 1) * 4 */
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"mov r8, %[r3] \n\t" /* r8 = (num_words - 1) * 4 */
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"lsls %[r3], #1 \n\t" /* r3 = (num_words - 1) * 8 */
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"mov r9, %[r3] \n\t" /* r9 = (num_words - 1) * 8 */
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"movs %[r3], #0 \n\t" /* c0 = 0 */
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"movs %[r4], #0 \n\t" /* c1 = 0 */
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"movs %[r5], #0 \n\t" /* c2 = 0 */
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"movs %[r6], #0 \n\t" /* k = 0 */
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"push {r0} \n\t" /* keep result on the stack */
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"push {%[r0]} \n\t" /* keep result on the stack */
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"1: \n\t" /* outer loop (k < num_words) */
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"movs r7, #0 \n\t" /* r7 = i = 0 */
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"movs %[r7], #0 \n\t" /* r7 = i = 0 */
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"b 3f \n\t"
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"2: \n\t" /* outer loop (k >= num_words) */
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"movs r7, r6 \n\t" /* r7 = k */
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"subs r7, %[last_word] \n\t" /* r7 = i = k - (num_words - 1) (times 4) */
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"movs %[r7], %[r6] \n\t" /* r7 = k */
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"mov %[r0], r8 \n\t" /* r0 = (num_words - 1) * 4 */
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"subs %[r7], %[r0] \n\t" /* r7 = i = k - (num_words - 1) (times 4) */
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"3: \n\t" /* inner loop */
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"push {r3, r4, r5, r6} \n\t" /* push things, r3 (c0) is at the top of stack. */
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"subs r0, r6, r7 \n\t" /* r0 = k - i */
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"push {%[r3], %[r4], %[r5], %[r6]} \n\t" /* push things, r3 (c0) is at the top of stack. */
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"subs %[r0], %[r6], %[r7] \n\t" /* r0 = k - i */
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"ldr r4, [r2, r0] \n\t" /* r4 = right[k - i] */
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"ldr r0, [r1, r7] \n\t" /* r0 = left[i] */
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"ldr %[r4], [%[r2], %[r0]] \n\t" /* r4 = right[k - i] */
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"ldr %[r0], [%[r1], %[r7]] \n\t" /* r0 = left[i] */
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"lsrs r3, r0, #16 \n\t" /* r3 = a1 */
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"uxth r0, r0 \n\t" /* r0 = a0 */
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"lsrs %[r3], %[r0], #16 \n\t" /* r3 = a1 */
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"uxth %[r0], %[r0] \n\t" /* r0 = a0 */
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"lsrs r5, r4, #16 \n\t" /* r5 = b1 */
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"uxth r4, r4 \n\t" /* r4 = b0 */
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"lsrs %[r5], %[r4], #16 \n\t" /* r5 = b1 */
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"uxth %[r4], %[r4] \n\t" /* r4 = b0 */
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"movs r6, r3 \n\t" /* r6 = a1 */
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"muls r6, r5, r6 \n\t" /* r6 = a1 * b1 */
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"muls r3, r4, r3 \n\t" /* r3 = b0 * a1 */
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"muls r5, r0, r5 \n\t" /* r5 = a0 * b1 */
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"muls r0, r4, r0 \n\t" /* r0 = a0 * b0 */
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"movs %[r6], %[r3] \n\t" /* r6 = a1 */
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"muls %[r6], %[r5], %[r6] \n\t" /* r6 = a1 * b1 */
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"muls %[r3], %[r4], %[r3] \n\t" /* r3 = b0 * a1 */
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"muls %[r5], %[r0], %[r5] \n\t" /* r5 = a0 * b1 */
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"muls %[r0], %[r4], %[r0] \n\t" /* r0 = a0 * b0 */
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"movs r4, #0 \n\t" /* r4 = 0 */
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"adds r3, r5 \n\t" /* r3 = b0 * a1 + a0 * b1 */
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"adcs r4, r4 \n\t" /* r4 = carry */
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"lsls r4, #16 \n\t" /* r4 = carry << 16 */
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"adds r6, r4 \n\t" /* r6 = a1 * b1 + carry */
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"movs %[r4], #0 \n\t" /* r4 = 0 */
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"adds %[r3], %[r5] \n\t" /* r3 = b0 * a1 + a0 * b1 */
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"adcs %[r4], %[r4] \n\t" /* r4 = carry */
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"lsls %[r4], #16 \n\t" /* r4 = carry << 16 */
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"adds %[r6], %[r4] \n\t" /* r6 = a1 * b1 + carry */
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"lsls r4, r3, #16 \n\t" /* r4 = (b0 * a1 + a0 * b1) << 16 */
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"lsrs r3, #16 \n\t" /* r3 = (b0 * a1 + a0 * b1) >> 16 */
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"adds r0, r4 \n\t" /* r0 = low word = a0 * b0 + ((b0 * a1 + a0 * b1) << 16) */
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"adcs r6, r3 \n\t" /* r6 = high word = a1 * b1 + carry + ((b0 * a1 + a0 * b1) >> 16) */
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"lsls %[r4], %[r3], #16 \n\t" /* r4 = (b0 * a1 + a0 * b1) << 16 */
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"lsrs %[r3], #16 \n\t" /* r3 = (b0 * a1 + a0 * b1) >> 16 */
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"adds %[r0], %[r4] \n\t" /* r0 = low word = a0 * b0 + ((b0 * a1 + a0 * b1) << 16) */
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"adcs %[r6], %[r3] \n\t" /* r6 = high word =
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a1 * b1 + carry + ((b0 * a1 + a0 * b1) >> 16) */
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"pop {r3, r4, r5} \n\t" /* r3 = c0, r4 = c1, r5 = c2 */
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"adds r3, r0 \n\t" /* add low word to c0 */
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"adcs r4, r6 \n\t" /* add high word to c1, including carry */
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"movs r0, #0 \n\t" /* r0 = 0 (does not affect carry bit) */
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"adcs r5, r0 \n\t" /* add carry to c2 */
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"pop {%[r3], %[r4], %[r5]} \n\t" /* r3 = c0, r4 = c1, r5 = c2 */
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"adds %[r3], %[r0] \n\t" /* add low word to c0 */
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"adcs %[r4], %[r6] \n\t" /* add high word to c1, including carry */
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"movs %[r0], #0 \n\t" /* r0 = 0 (does not affect carry bit) */
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"adcs %[r5], %[r0] \n\t" /* add carry to c2 */
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"pop {r6} \n\t" /* r6 = k */
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"pop {%[r6]} \n\t" /* r6 = k */
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"adds r7, #4 \n\t" /* i += 4 */
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"cmp r7, %[last_word] \n\t" /* i > (num_words - 1) (times 4)? */
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"bgt 4f \n\t" /* if so, exit the loop */
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"cmp r7, r6 \n\t" /* i <= k? */
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"ble 3b \n\t" /* if so, continue looping */
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"adds %[r7], #4 \n\t" /* i += 4 */
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"cmp %[r7], r8 \n\t" /* i > (num_words - 1) (times 4)? */
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"bgt 4f \n\t" /* if so, exit the loop */
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"cmp %[r7], %[r6] \n\t" /* i <= k? */
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"ble 3b \n\t" /* if so, continue looping */
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"4: \n\t" /* end inner loop */
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"ldr r0, [sp, #0] \n\t" /* r0 = result */
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"ldr %[r0], [sp, #0] \n\t" /* r0 = result */
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"str r3, [r0, r6] \n\t" /* result[k] = c0 */
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"mov r3, r4 \n\t" /* c0 = c1 */
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"mov r4, r5 \n\t" /* c1 = c2 */
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"movs r5, #0 \n\t" /* c2 = 0 */
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"adds r6, #4 \n\t" /* k += 4 */
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"cmp r6, %[last_word] \n\t" /* k <= (num_words - 1) (times 4) ? */
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"ble 1b \n\t" /* if so, loop back, start with i = 0 */
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"cmp r6, %[lw2] \n\t" /* k <= (num_words * 2 - 2) (times 4) ? */
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"ble 2b \n\t" /* if so, loop back, start with i = (k + 1) - num_words */
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"str %[r3], [%[r0], %[r6]] \n\t" /* result[k] = c0 */
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"mov %[r3], %[r4] \n\t" /* c0 = c1 */
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"mov %[r4], %[r5] \n\t" /* c1 = c2 */
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"movs %[r5], #0 \n\t" /* c2 = 0 */
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"adds %[r6], #4 \n\t" /* k += 4 */
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"cmp %[r6], r8 \n\t" /* k <= (num_words - 1) (times 4) ? */
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"ble 1b \n\t" /* if so, loop back, start with i = 0 */
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"cmp %[r6], r9 \n\t" /* k <= (num_words * 2 - 2) (times 4) ? */
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"ble 2b \n\t" /* if so, loop back, with i = (k + 1) - num_words */
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/* end outer loop */
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"str r3, [r0, r6] \n\t" /* result[num_words * 2 - 1] = c0 */
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"pop {r0} \n\t" /* pop result off the stack */
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"str %[r3], [%[r0], %[r6]] \n\t" /* result[num_words * 2 - 1] = c0 */
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"pop {%[r0]} \n\t" /* pop result off the stack */
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".syntax divided \n\t"
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:
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: [r0] "l" (r0), [r1] "l" (r1), [r2] "l" (r2),
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[last_word] "r" ((num_words - 1) * 4), [lw2] "r" ((num_words - 1) * 4 * 2)
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: "r3", "r4", "r5", "r6", "r7", "cc", "memory"
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: [r3] "+l" (num_words), [r4] "=&l" (r4),
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[r5] "=&l" (r5), [r6] "=&l" (r6), [r7] "=&l" (r7)
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: [r0] "l" (result), [r1] "l" (left), [r2] "l" (right)
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: "r8", "r9", "cc", "memory"
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);
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#endif
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}
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@@ -1154,105 +1158,111 @@ uECC_VLI_API void uECC_vli_square(uECC_word_t *result,
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);
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#else
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uint32_t r3, r4, r5, r6, r7;
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register uint32_t *r0 __asm__("r0") = result;
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register const uint32_t *r1 __asm__("r1") = left;
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__asm__ volatile (
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".syntax unified \n\t"
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"movs r2, #0 \n\t" /* c0 = 0 */
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"movs r3, #0 \n\t" /* c1 = 0 */
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"movs r4, #0 \n\t" /* c2 = 0 */
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"movs r5, #0 \n\t" /* k = 0 */
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"subs %[r2], #1 \n\t" /* r2 = num_words - 1 */
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"lsls %[r2], #2 \n\t" /* r2 = (num_words - 1) * 4 */
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"mov r8, %[r2] \n\t" /* r8 = (num_words - 1) * 4 */
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"lsls %[r2], #1 \n\t" /* r2 = (num_words - 1) * 8 */
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"mov r9, %[r2] \n\t" /* r9 = (num_words - 1) * 8 */
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"movs %[r2], #0 \n\t" /* c0 = 0 */
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"movs %[r3], #0 \n\t" /* c1 = 0 */
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"movs %[r4], #0 \n\t" /* c2 = 0 */
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"movs %[r5], #0 \n\t" /* k = 0 */
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"push {r0} \n\t" /* keep result on the stack */
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"push {%[r0]} \n\t" /* keep result on the stack */
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"1: \n\t" /* outer loop (k < num_words) */
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"movs r6, #0 \n\t" /* r6 = i = 0 */
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"movs %[r6], #0 \n\t" /* r6 = i = 0 */
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"b 3f \n\t"
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"2: \n\t" /* outer loop (k >= num_words) */
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"movs r6, r5 \n\t" /* r6 = k */
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"subs r6, %[last_word] \n\t" /* r6 = i = k - (num_words - 1) (times 4) */
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"movs %[r6], %[r5] \n\t" /* r6 = k */
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"mov %[r0], r8 \n\t" /* r0 = (num_words - 1) * 4 */
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"subs %[r6], %[r0] \n\t" /* r6 = i = k - (num_words - 1) (times 4) */
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"3: \n\t" /* inner loop */
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"push {r2, r3, r4, r5} \n\t" /* push things, r2 (c0) is at the top of stack. */
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"subs r7, r5, r6 \n\t" /* r7 = k - i */
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"push {%[r2], %[r3], %[r4], %[r5]} \n\t" /* push things, r2 (c0) is at the top of stack. */
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"subs %[r7], %[r5], %[r6] \n\t" /* r7 = k - i */
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"ldr r3, [r1, r7] \n\t" /* r3 = left[k - i] */
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"ldr r0, [r1, r6] \n\t" /* r0 = left[i] */
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"ldr %[r3], [%[r1], %[r7]] \n\t" /* r3 = left[k - i] */
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"ldr %[r0], [%[r1], %[r6]] \n\t" /* r0 = left[i] */
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"lsrs r2, r0, #16 \n\t" /* r2 = a1 */
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"uxth r0, r0 \n\t" /* r0 = a0 */
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"lsrs %[r2], %[r0], #16 \n\t" /* r2 = a1 */
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"uxth %[r0], %[r0] \n\t" /* r0 = a0 */
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"lsrs r4, r3, #16 \n\t" /* r4 = b1 */
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"uxth r3, r3 \n\t" /* r3 = b0 */
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"lsrs %[r4], %[r3], #16 \n\t" /* r4 = b1 */
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"uxth %[r3], %[r3] \n\t" /* r3 = b0 */
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"movs r5, r2 \n\t" /* r5 = a1 */
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"muls r5, r4, r5 \n\t" /* r5 = a1 * b1 */
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"muls r2, r3, r2 \n\t" /* r2 = b0 * a1 */
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"muls r4, r0, r4 \n\t" /* r4 = a0 * b1 */
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"muls r0, r3, r0 \n\t" /* r0 = a0 * b0 */
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"movs %[r5], %[r2] \n\t" /* r5 = a1 */
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"muls %[r5], %[r4], %[r5] \n\t" /* r5 = a1 * b1 */
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"muls %[r2], %[r3], %[r2] \n\t" /* r2 = b0 * a1 */
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"muls %[r4], %[r0], %[r4] \n\t" /* r4 = a0 * b1 */
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"muls %[r0], %[r3], %[r0] \n\t" /* r0 = a0 * b0 */
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"movs r3, #0 \n\t" /* r3 = 0 */
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"adds r2, r4 \n\t" /* r2 = b0 * a1 + a0 * b1 */
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"adcs r3, r3 \n\t" /* r3 = carry */
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"lsls r3, #16 \n\t" /* r3 = carry << 16 */
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"adds r5, r3 \n\t" /* r5 = a1 * b1 + carry */
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"movs %[r3], #0 \n\t" /* r3 = 0 */
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"adds %[r2], %[r4] \n\t" /* r2 = b0 * a1 + a0 * b1 */
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"adcs %[r3], %[r3] \n\t" /* r3 = carry */
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"lsls %[r3], #16 \n\t" /* r3 = carry << 16 */
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"adds %[r5], %[r3] \n\t" /* r5 = a1 * b1 + carry */
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"lsls r3, r2, #16 \n\t" /* r3 = (b0 * a1 + a0 * b1) << 16 */
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"lsrs r2, #16 \n\t" /* r2 = (b0 * a1 + a0 * b1) >> 16 */
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"adds r0, r3 \n\t" /* r0 = low word = a0 * b0 + ((b0 * a1 + a0 * b1) << 16) */
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"adcs r5, r2 \n\t" /* r5 = high word = a1 * b1 + carry + ((b0 * a1 + a0 * b1) >> 16) */
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"lsls %[r3], %[r2], #16 \n\t" /* r3 = (b0 * a1 + a0 * b1) << 16 */
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"lsrs %[r2], #16 \n\t" /* r2 = (b0 * a1 + a0 * b1) >> 16 */
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"adds %[r0], %[r3] \n\t" /* r0 = low word = a0 * b0 + ((b0 * a1 + a0 * b1) << 16) */
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"adcs %[r5], %[r2] \n\t" /* r5 = high word =
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a1 * b1 + carry + ((b0 * a1 + a0 * b1) >> 16) */
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"movs r3, #0 \n\t" /* r3 = 0 */
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"cmp r6, r7 \n\t" /* (i < k - i) ? */
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"mov r7, r3 \n\t" /* r7 = 0 (does not affect condition)*/
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"bge 4f \n\t" /* if i >= k - i, skip */
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"lsls r5, #1 \n\t" /* high word << 1 */
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"adcs r7, r3 \n\t" /* r7 = carry bit for c2 */
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"lsls r0, #1 \n\t" /* low word << 1 */
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"adcs r5, r3 \n\t" /* add carry from shift to high word */
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"movs %[r3], #0 \n\t" /* r3 = 0 */
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"cmp %[r6], %[r7] \n\t" /* (i < k - i) ? */
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"mov %[r7], %[r3] \n\t" /* r7 = 0 (does not affect condition) */
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"bge 4f \n\t" /* if i >= k - i, skip */
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"lsls %[r5], #1 \n\t" /* high word << 1 */
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"adcs %[r7], %[r3] \n\t" /* r7 = carry bit for c2 */
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"lsls %[r0], #1 \n\t" /* low word << 1 */
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"adcs %[r5], %[r3] \n\t" /* add carry from shift to high word */
|
||||
|
||||
"4: \n\t"
|
||||
"pop {r2, r3, r4} \n\t" /* r2 = c0, r3 = c1, r4 = c2 */
|
||||
"adds r2, r0 \n\t" /* add low word to c0 */
|
||||
"adcs r3, r5 \n\t" /* add high word to c1, including carry */
|
||||
"movs r0, #0 \n\t" /* r0 = 0 (does not affect carry bit) */
|
||||
"adcs r4, r0 \n\t" /* add carry to c2 */
|
||||
"adds r4, r7 \n\t" /* add carry from doubling (if any) */
|
||||
"pop {%[r2], %[r3], %[r4]} \n\t" /* r2 = c0, r3 = c1, r4 = c2 */
|
||||
"adds %[r2], %[r0] \n\t" /* add low word to c0 */
|
||||
"adcs %[r3], %[r5] \n\t" /* add high word to c1, including carry */
|
||||
"movs %[r0], #0 \n\t" /* r0 = 0 (does not affect carry bit) */
|
||||
"adcs %[r4], %[r0] \n\t" /* add carry to c2 */
|
||||
"adds %[r4], %[r7] \n\t" /* add carry from doubling (if any) */
|
||||
|
||||
"pop {r5} \n\t" /* r5 = k */
|
||||
"pop {%[r5]} \n\t" /* r5 = k */
|
||||
|
||||
"adds r6, #4 \n\t" /* i += 4 */
|
||||
"cmp r6, r5 \n\t" /* i >= k? */
|
||||
"bge 5f \n\t" /* if so, exit the loop */
|
||||
"subs r7, r5, r6 \n\t" /* r7 = k - i */
|
||||
"cmp r6, r7 \n\t" /* i <= k - i? */
|
||||
"ble 3b \n\t" /* if so, continue looping */
|
||||
"adds %[r6], #4 \n\t" /* i += 4 */
|
||||
"cmp %[r6], %[r5] \n\t" /* i >= k? */
|
||||
"bge 5f \n\t" /* if so, exit the loop */
|
||||
"subs %[r7], %[r5], %[r6] \n\t" /* r7 = k - i */
|
||||
"cmp %[r6], %[r7] \n\t" /* i <= k - i? */
|
||||
"ble 3b \n\t" /* if so, continue looping */
|
||||
|
||||
"5: \n\t" /* end inner loop */
|
||||
|
||||
"ldr r0, [sp, #0] \n\t" /* r0 = result */
|
||||
"ldr %[r0], [sp, #0] \n\t" /* r0 = result */
|
||||
|
||||
"str r2, [r0, r5] \n\t" /* result[k] = c0 */
|
||||
"mov r2, r3 \n\t" /* c0 = c1 */
|
||||
"mov r3, r4 \n\t" /* c1 = c2 */
|
||||
"movs r4, #0 \n\t" /* c2 = 0 */
|
||||
"adds r5, #4 \n\t" /* k += 4 */
|
||||
"cmp r5, %[last_word] \n\t" /* k <= (num_words - 1) (times 4) ? */
|
||||
"ble 1b \n\t" /* if so, loop back, start with i = 0 */
|
||||
"cmp r5, %[lw2] \n\t" /* k <= (num_words * 2 - 2) (times 4) ? */
|
||||
"ble 2b \n\t" /* if so, loop back, start with i = (k + 1) - num_words */
|
||||
"str %[r2], [%[r0], %[r5]] \n\t" /* result[k] = c0 */
|
||||
"mov %[r2], %[r3] \n\t" /* c0 = c1 */
|
||||
"mov %[r3], %[r4] \n\t" /* c1 = c2 */
|
||||
"movs %[r4], #0 \n\t" /* c2 = 0 */
|
||||
"adds %[r5], #4 \n\t" /* k += 4 */
|
||||
"cmp %[r5], r8 \n\t" /* k <= (num_words - 1) (times 4) ? */
|
||||
"ble 1b \n\t" /* if so, loop back, start with i = 0 */
|
||||
"cmp %[r5], r9 \n\t" /* k <= (num_words * 2 - 2) (times 4) ? */
|
||||
"ble 2b \n\t" /* if so, loop back, with i = (k + 1) - num_words */
|
||||
/* end outer loop */
|
||||
|
||||
"str r2, [r0, r5] \n\t" /* result[num_words * 2 - 1] = c0 */
|
||||
"pop {r0} \n\t" /* pop result off the stack */
|
||||
"str %[r2], [%[r0], %[r5]] \n\t" /* result[num_words * 2 - 1] = c0 */
|
||||
"pop {%[r0]} \n\t" /* pop result off the stack */
|
||||
|
||||
".syntax divided \n\t"
|
||||
: [r0] "+l" (r0), [r1] "+l" (r1)
|
||||
: [last_word] "r" ((num_words - 1) * 4), [lw2] "r" ((num_words - 1) * 4 * 2)
|
||||
: "r2", "r3", "r4", "r5", "r6", "r7", "cc", "memory"
|
||||
: [r2] "+l" (num_words), [r3] "=&l" (r3), [r4] "=&l" (r4),
|
||||
[r5] "=&l" (r5), [r6] "=&l" (r6), [r7] "=&l" (r7)
|
||||
: [r0] "l" (result), [r1] "l" (left)
|
||||
: "r8", "r9", "cc", "memory"
|
||||
);
|
||||
#endif
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user