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libc: fprem fmod()

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This commit is contained in:
K. Lange 2018-12-08 13:33:25 +09:00
parent 52f35de578
commit d63c98b6bf
1 changed files with 9 additions and 8 deletions
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17
libc/math/math.c
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@ -78,14 +78,15 @@ float fabsf(float x) {
double fmod(double x, double y) {
MATH;
if (x >= 0.0) {
while (x > y) {
x -= y;
}
return x;
} else {
return 0.0;
}
long double out;
asm volatile (
"1: fprem;" /* Partial remainder */
" fnstsw %%ax;" /* store status word */
" sahf;" /* store AX (^ FPU status) into flags */
" jp 1b;" /* jump back to 1 above if parity flag==1 */
: "=t"(out) : "0"(x), "u"(y) : "ax", "cc");
return out;
}
double sqrt(double x) {