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-rw-r--r--src/math/sinf.c33
1 files changed, 18 insertions, 15 deletions
diff --git a/src/math/sinf.c b/src/math/sinf.c
index dcca67af..64e39f50 100644
--- a/src/math/sinf.c
+++ b/src/math/sinf.c
@@ -26,35 +26,38 @@ s4pio2 = 4*M_PI_2; /* 0x401921FB, 0x54442D18 */
float sinf(float x)
{
double y;
- int32_t n, hx, ix;
+ uint32_t ix;
+ int n, sign;
- GET_FLOAT_WORD(hx, x);
- ix = hx & 0x7fffffff;
+ GET_FLOAT_WORD(ix, x);
+ sign = ix >> 31;
+ ix &= 0x7fffffff;
if (ix <= 0x3f490fda) { /* |x| ~<= pi/4 */
- if (ix < 0x39800000) /* |x| < 2**-12 */
- /* raise inexact if x != 0 */
- if((int)x == 0)
- return x;
+ if (ix < 0x39800000) { /* |x| < 2**-12 */
+ /* raise inexact if x!=0 and underflow if subnormal */
+ FORCE_EVAL(ix < 0x00800000 ? x/0x1p120f : x+0x1p120f);
+ return x;
+ }
return __sindf(x);
}
if (ix <= 0x407b53d1) { /* |x| ~<= 5*pi/4 */
if (ix <= 0x4016cbe3) { /* |x| ~<= 3pi/4 */
- if (hx > 0)
- return __cosdf(x - s1pio2);
- else
+ if (sign)
return -__cosdf(x + s1pio2);
+ else
+ return __cosdf(x - s1pio2);
}
- return __sindf(hx > 0 ? s2pio2 - x : -s2pio2 - x);
+ return __sindf(sign ? -(x + s2pio2) : -(x - s2pio2));
}
if (ix <= 0x40e231d5) { /* |x| ~<= 9*pi/4 */
if (ix <= 0x40afeddf) { /* |x| ~<= 7*pi/4 */
- if (hx > 0)
- return -__cosdf(x - s3pio2);
- else
+ if (sign)
return __cosdf(x + s3pio2);
+ else
+ return -__cosdf(x - s3pio2);
}
- return __sindf(hx > 0 ? x - s4pio2 : x + s4pio2);
+ return __sindf(sign ? x + s4pio2 : x - s4pio2);
}
/* sin(Inf or NaN) is NaN */