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-rw-r--r--src/math/cosf.c33
1 files changed, 19 insertions, 14 deletions
diff --git a/src/math/cosf.c b/src/math/cosf.c
index 4d94130f..23f3e5bf 100644
--- a/src/math/cosf.c
+++ b/src/math/cosf.c
@@ -26,34 +26,39 @@ c4pio2 = 4*M_PI_2; /* 0x401921FB, 0x54442D18 */
float cosf(float x)
{
double y;
- int32_t n, hx, ix;
+ uint32_t ix;
+ unsigned n, sign;
+
+ GET_FLOAT_WORD(ix, x);
+ sign = ix >> 31;
+ ix &= 0x7fffffff;
- GET_FLOAT_WORD(hx, x);
- ix = hx & 0x7fffffff;
if (ix <= 0x3f490fda) { /* |x| ~<= pi/4 */
- if (ix < 0x39800000) /* |x| < 2**-12 */
- if ((int)x == 0) /* raise inexact if x != 0 */
- return 1.0;
+ if (ix < 0x39800000) { /* |x| < 2**-12 */
+ /* raise inexact if x != 0 */
+ FORCE_EVAL(x + 0x1p120f);
+ return 1.0f;
+ }
return __cosdf(x);
}
if (ix <= 0x407b53d1) { /* |x| ~<= 5*pi/4 */
if (ix > 0x4016cbe3) /* |x| ~> 3*pi/4 */
- return -__cosdf(hx > 0 ? x-c2pio2 : x+c2pio2);
+ return -__cosdf(sign ? x+c2pio2 : x-c2pio2);
else {
- if (hx > 0)
- return __sindf(c1pio2 - x);
- else
+ if (sign)
return __sindf(x + c1pio2);
+ else
+ return __sindf(c1pio2 - x);
}
}
if (ix <= 0x40e231d5) { /* |x| ~<= 9*pi/4 */
if (ix > 0x40afeddf) /* |x| ~> 7*pi/4 */
- return __cosdf(hx > 0 ? x-c4pio2 : x+c4pio2);
+ return __cosdf(sign ? x+c4pio2 : x-c4pio2);
else {
- if (hx > 0)
- return __sindf(x - c3pio2);
+ if (sign)
+ return __sindf(-x - c3pio2);
else
- return __sindf(-c3pio2 - x);
+ return __sindf(x - c3pio2);
}
}