- 20 3月, 2012 10 次提交
-
-
由 nsz 提交于
zero, one, two, half are replaced by const literals The policy was to use the f suffix for float consts (1.0f), but don't use suffix for long double consts (these consts can be exactly represented as double).
-
由 nsz 提交于
-
由 nsz 提交于
Underflow exception is only raised when the result is invalid, but fmod is always exact. x87 has a denormalization exception, but that's nonstandard. And the superflous *1.0 will be optimized away by any compiler that does not honor signaling nans.
-
由 nsz 提交于
-
由 nsz 提交于
Some code assumed ldexp(x, 1) is faster than 2.0*x, but ldexp is a wrapper around scalbn which uses multiplications inside, so this optimization is wrong. This commit also fixes fmal which accidentally used ldexp instead of ldexpl loosing precision. There are various additional changes from the work-in-progress const cleanups.
-
由 nsz 提交于
-
由 nsz 提交于
-
由 nsz 提交于
-
由 nsz 提交于
Some long double consts were stored in two doubles as a workaround for x86_64 and i386 with the following comment: /* Long double constants are slow on these arches, and broken on i386. */ This is most likely old gcc bug related to the default x87 fpu precision setting (it's double instead of double extended on BSD).
-
由 nsz 提交于
-
- 19 3月, 2012 27 次提交
-
-
由 Rich Felker 提交于
-
由 Rich Felker 提交于
-
由 Rich Felker 提交于
this could perhaps use some additional testing for corner cases, but it seems to be correct.
-
由 Rich Felker 提交于
up to 30% faster exp2 by avoiding slow frndint and fscale functions. expm1 also takes a much more direct path for small arguments (the expected usage case).
-
由 Rich Felker 提交于
-
由 Rich Felker 提交于
-
由 Rich Felker 提交于
-
由 nsz 提交于
The old scalbn.c was wrong and slow, the new one is just slow. (scalbn(0x1p+1023,-2097) should give 0x1p-1074, but the old code gave 0)
-
-
由 Rich Felker 提交于
-
-
由 Rich Felker 提交于
unlike some implementations, these functions perform the equivalent of gcc's -ffloat-store on the result before returning. this is necessary to raise underflow/overflow/inexact exceptions, perform the correct rounding with denormals, etc.
-
由 Rich Felker 提交于
unlike trig functions, these are easy to do in asm because they do not involve (arbitrary-precision) argument reduction. fpatan automatically takes care of domain issues, and in asin and acos, fsqrt takes care of them for us.
-
-
由 Rich Felker 提交于
-
由 Rich Felker 提交于
infinities were getting converted into nans. the new code simply tests for infinity and replaces it with a large magnitude value of the same sign. also, the fcomi instruction is apparently not part of the i387 instruction set, so avoid using it.
-
由 Rich Felker 提交于
-
-
由 Rich Felker 提交于
-
由 nsz 提交于
-
由 nsz 提交于
-
由 nsz 提交于
correctly rounded double precision fma using extended precision arithmetics for ld80 systems (x87)
-
由 Rich Felker 提交于
-
由 Rich Felker 提交于
these are functions that have direct fpu approaches to implementation without problematic exception or rounding issues. x86_64 lacks float/double versions because i'm unfamiliar with the necessary sse code for performing these operations.
-
由 nsz 提交于
Simple wrappers around round is enough because spurious inexact exception is allowed.
-
由 nsz 提交于
-
由 nsz 提交于
A faster workaround for spurious inexact exceptions when the result cannot be represented. The old code actually could be wrong, because gcc reordered the integer conversion and the exception check.
-
- 18 3月, 2012 3 次提交
-
-
由 Rich Felker 提交于
-
由 Rich Felker 提交于
it's not even provided in the library at the moment, but could easily be provided with weak aliases if desired.
-
由 Rich Felker 提交于
-