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LibM: Use assembly for all atan versions

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Hendiadyoin1 2021-07-05 16:56:06 +02:00 • committed by Andreas Kling
parent 119f280f34
commit b583726deb
1 changed files with 34 additions and 23 deletions
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57
Userland/Libraries/LibM/math.cpp
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@ -729,50 +729,61 @@ float coshf(float x) NOEXCEPT
long double atan2l(long double y, long double x) NOEXCEPT long double atan2l(long double y, long double x) NOEXCEPT
{ {
if (x == 0) {
if (y > 0)
return M_PI_2;
if (y < 0)
return -M_PI_2;
return 0;
}
long double result = 0; //atanl(y / x); long double result = 0; //atanl(y / x);
__asm__("fpatan" asm("fpatan"
: "=t"(result) : "=t"(result)
: "0"(x), "u"(y) : "0"(x), "u"(y)
: "st(1)"); : "st(1)");
return result; return result;
} }
double atan2(double y, double x) NOEXCEPT double atan2(double y, double x) NOEXCEPT
{ {
return (double)atan2l(y, x); double result = 0; //atanl(y / x);
asm("fpatan"
: "=t"(result)
: "0"(x), "u"(y)
: "st(1)");
return result;
} }
float atan2f(float y, float x) NOEXCEPT float atan2f(float y, float x) NOEXCEPT
{ {
return (float)atan2l(y, x); float result = 0; //atanl(y / x);
asm("fpatan"
: "=t"(result)
: "0"(x), "u"(y)
: "st(1)");
return result;
} }
long double atanl(long double x) NOEXCEPT long double atanl(long double x) NOEXCEPT
{ {
if (x < 0) asm(
return -atanl(-x); "fld1\n"
if (x > 1) "fpatan\n"
return M_PI_2 - atanl(1 / x); : "=t"(x)
long double squared = x * x; : "0"(x));
return x / (1 + 1 * 1 * squared / (3 + 2 * 2 * squared / (5 + 3 * 3 * squared / (7 + 4 * 4 * squared / (9 + 5 * 5 * squared / (11 + 6 * 6 * squared / (13 + 7 * 7 * squared))))))); return x;
} }
double atan(double x) NOEXCEPT double atan(double x) NOEXCEPT
{ {
return (double)atanl(x); asm(
"fld1\n"
"fpatan\n"
: "=t"(x)
: "0"(x));
return x;
} }
float atanf(float x) NOEXCEPT float atanf(float x) NOEXCEPT
{ {
return (float)atanl(x); asm(
"fld1\n"
"fpatan\n"
: "=t"(x)
: "0"(x));
return x;
} }
long double asinl(long double x) NOEXCEPT long double asinl(long double x) NOEXCEPT