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asm_avr.inc: fix compilation on GCC 15.2.0 #237

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asm_avr.inc: fix compilation on GCC 15.2.0 #237

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9 changes: 7 additions & 2 deletions asm_avr.inc
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Original file line number Diff line number Diff line change
Expand Up @@ -905,13 +905,18 @@ uECC_VLI_API void uECC_vli_mult(uECC_word_t *result,
const uECC_word_t *left,
const uECC_word_t *right,
wordcount_t num_words) {
volatile uECC_word_t *r = result;
uint8_t r0 = 0;
uint8_t r1 = 0;
uint8_t r2 = 0;
uint8_t zero = 0;
uint8_t k, i;

/* manually allocate right to register Y to work around bug in GCC 15.2 */
register uint8_t yl asm("r28");
register uint8_t yh asm("r29");
yl = (uint8_t)(unsigned)right;
yh = (uint8_t)(((unsigned)right) >> 8);

__asm__ volatile (
"ldi %[k], 1 \n\t" /* k = 1; k < num_words; ++k */

Expand Down Expand Up @@ -986,7 +991,7 @@ uECC_VLI_API void uECC_vli_mult(uECC_word_t *result,
"st z+, %[r0] \n\t" /* Store last result byte. */
"eor r1, r1 \n\t" /* fix r1 to be 0 again */

: "+z" (result), "+x" (left), "+y" (right),
: "+z" (result), "+x" (left), "+r" (yl), "+r" (yh),
[r0] "+r" (r0), [r1] "+r" (r1), [r2] "+r" (r2),
[zero] "+r" (zero), [num] "+r" (num_words),
[k] "=&r" (k), [i] "=&r" (i)
Expand Down