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Cycles: Make util_math_fast.h compatible with OpenCL

This commit is contained in:
Sergey Sharybin 2015-02-19 12:29:06 +05:00
parent 5721863805
commit 5004b58262
1 changed files with 4 additions and 4 deletions
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8
intern/cycles/util/util_math_fast.h
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@ -362,7 +362,7 @@ ccl_device float fast_log2f(float x)
* negative values/nans. */
clamp(x, FLT_MIN, FLT_MAX);
unsigned bits = __float_as_uint(x);
int exponent = int(bits >> 23) - 127;
int exponent = (int)(bits >> 23) - 127;
float f = __uint_as_float((bits & 0x007FFFFF) | 0x3f800000) - 1.0f;
/* Examined 2130706432 values of log2 on [1.17549435e-38,3.40282347e+38]:
* 0.0797524457 avg ulp diff, 3713596 max ulp, 7.62939e-06 max error.
@ -404,7 +404,7 @@ ccl_device float fast_logb(float x)
x = fabsf(x);
clamp(x, FLT_MIN, FLT_MAX);
unsigned bits = __float_as_uint(x);
return int(bits >> 23) - 127;
return (int)(bits >> 23) - 127;
}
ccl_device float fast_exp2f(float x)
@ -412,7 +412,7 @@ ccl_device float fast_exp2f(float x)
/* Clamp to safe range for final addition. */
clamp(x, -126.0f, 126.0f);
/* Range reduction. */
int m = int(x); x -= m;
int m = (int)x; x -= m;
x = 1.0f - (1.0f - x); /* Crush denormals (does not affect max ulps!). */
/* 5th degree polynomial generated with sollya
* Examined 2247622658 values of exp2 on [-126,126]: 2.75764912 avg ulp diff,
@ -430,7 +430,7 @@ ccl_device float fast_exp2f(float x)
r = madd(x, r, 1.0f);
/* Multiply by 2 ^ m by adding in the exponent. */
/* NOTE: left-shift of negative number is undefined behavior. */
return __uint_as_float(__float_as_uint(r) + (unsigned(m) << 23));
return __uint_as_float(__float_as_uint(r) + ((unsigned)m << 23));
}
ccl_device_inline float fast_expf(float x)