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Added ARM specific fix16_mul which should be faster, this is untested however so if somebody with an ARM target could compile and check it then I'd be greatful.

This commit is contained in:
flatmush 2011-03-04 12:42:58 +00:00
parent 5fd33d1f98
commit 98bbaf3b17
1 changed files with 17 additions and 0 deletions
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17
libfixmath/fix16.c
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@ -14,6 +14,22 @@ fix16_t fix16_sadd(fix16_t inArg0, fix16_t inArg1) {
#if defined(__arm__) || defined(_ARM)
fix16_t fix16_mul(int32_t inArg0, int32_t inArg1) {
fix16_t res;
asm(
"smull %1, r0, %2, %3\n\t"
#ifndef FIXMATH_NO_ROUNDING
"add %1, %1, #0x8000\n\t"
#endif
"mov %1, %1, LSR #16\n\t"
"or %1, %1, r0, LSL #16"
: "=r"(res)
: "r"(inArg0), "r"(inArg1)
: "r0");
return res;
}
#else
fix16_t fix16_mul(fix16_t inArg0, fix16_t inArg1) {
#ifndef FIXMATH_NO_64BIT
int64_t tempResult = ((int64_t)inArg0 * (int64_t)inArg1);
@ -39,6 +55,7 @@ fix16_t fix16_mul(fix16_t inArg0, fix16_t inArg1) {
return r_md;
#endif
}
#endif
fix16_t fix16_smul(fix16_t inArg0, fix16_t inArg1) {
#ifndef FIXMATH_NO_64BIT