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Minor additions to floating point math functions.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22086 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Wincent Balin 2009-07-29 21:35:38 +00:00
parent 2fb73842a9
commit f95dc688cf
1 changed files with 19 additions and 30 deletions
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49
apps/plugins/pdbox/pdbox-func.c
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@ -333,11 +333,19 @@ long rb_atol(const char* str)
float rb_sin(float rad) float rb_sin(float rad)
{ {
int cycles;
/* Trim input value to -PI..PI interval. */ /* Trim input value to -PI..PI interval. */
if(rad < -3.14159265) if(rad > 3.14159265)
rad += 6.28318531; {
else if(rad > 3.14159265) cycles = rad / 6.28318531;
rad -= 6.28318531; rad -= (6.28318531 * (float) cycles);
}
else if(rad < -3.14159265)
{
cycles = rad / -6.28318531;
rad += (6.28318531 * (float) cycles);
}
if(rad < 0) if(rad < 0)
return (1.27323954 * rad + 0.405284735 * rad * rad); return (1.27323954 * rad + 0.405284735 * rad * rad);
@ -348,11 +356,7 @@ float rb_sin(float rad)
float rb_cos(float rad) float rb_cos(float rad)
{ {
/* Compute cosine: sin(x + PI/2) = cos(x) */ /* Compute cosine: sin(x + PI/2) = cos(x) */
rad += 1.57079632; return rb_sin(rad + 1.57079632);
if(rad > 3.14159265)
rad -= 6.28318531;
return rb_sin(rad);
} }
@ -2108,54 +2112,39 @@ union ieee754_double
/* This is the IEEE 754 double-precision format. */ /* This is the IEEE 754 double-precision format. */
struct struct
{ {
#if defined(ROCKBOX_BIG_ENDIAN) #ifdef ROCKBOX_BIG_ENDIAN
unsigned int negative:1; unsigned int negative:1;
unsigned int exponent:11; unsigned int exponent:11;
/* Together these comprise the mantissa. */ /* Together these comprise the mantissa. */
unsigned int mantissa0:20; unsigned int mantissa0:20;
unsigned int mantissa1:32; unsigned int mantissa1:32;
#else #else /* ROCKBOX_LITTLE_ENDIAN */
# if __FLOAT_WORD_ORDER == __BIG_ENDIAN
unsigned int mantissa0:20;
unsigned int exponent:11;
unsigned int negative:1;
unsigned int mantissa1:32;
# else
/* Together these comprise the mantissa. */ /* Together these comprise the mantissa. */
unsigned int mantissa1:32; unsigned int mantissa1:32;
unsigned int mantissa0:20; unsigned int mantissa0:20;
unsigned int exponent:11; unsigned int exponent:11;
unsigned int negative:1; unsigned int negative:1;
# endif #endif /* ROCKBOX_LITTLE_ENDIAN */
#endif /* Little endian. */
} ieee; } ieee;
/* This format makes it easier to see if a NaN is a signalling NaN. */ /* This format makes it easier to see if a NaN is a signalling NaN. */
struct struct
{ {
#if defined(ROCKBOX_BIG_ENDIAN) #ifdef ROCKBOX_BIG_ENDIAN
unsigned int negative:1; unsigned int negative:1;
unsigned int exponent:11; unsigned int exponent:11;
unsigned int quiet_nan:1; unsigned int quiet_nan:1;
/* Together these comprise the mantissa. */ /* Together these comprise the mantissa. */
unsigned int mantissa0:19; unsigned int mantissa0:19;
unsigned int mantissa1:32; unsigned int mantissa1:32;
#else #else /* ROCKBOX_LITTLE_ENDIAN */
# if __FLOAT_WORD_ORDER == __BIG_ENDIAN
unsigned int mantissa0:19;
unsigned int quiet_nan:1;
unsigned int exponent:11;
unsigned int negative:1;
unsigned int mantissa1:32;
# else
/* Together these comprise the mantissa. */ /* Together these comprise the mantissa. */
unsigned int mantissa1:32; unsigned int mantissa1:32;
unsigned int mantissa0:19; unsigned int mantissa0:19;
unsigned int quiet_nan:1; unsigned int quiet_nan:1;
unsigned int exponent:11; unsigned int exponent:11;
unsigned int negative:1; unsigned int negative:1;
# endif #endif /* ROCKBOX_LITTLE_ENDIAN */
#endif
} ieee_nan; } ieee_nan;
}; };