AgeCommit message (Collapse)AuthorLines
2012-03-19remquo asm: return quotient mod 8, as intended by the specRich Felker-17/+26
this is a lot more efficient and also what is generally wanted. perhaps the bit shuffling could be more efficient...
2012-03-19use alternate formula for acos asm to avoid loss of precisionRich Felker-3/+11
2012-03-19Merge remote branch 'nsz/master'Rich Felker-806/+655
2012-03-19fix exp asmRich Felker-23/+22
exponents (base 2) near 16383 were broken due to (1) wrong cutoff, and (2) inability to fit the necessary range of scalings into a long double value. as a solution, we fall back to using frndint/fscale for insanely large exponents, and also have to special-case infinities here to avoid inf-inf generating nan. thankfully the costly code never runs in normal usage cases.
2012-03-19code cleanup of named constantsnsz-623/+513
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).
2012-03-19fix remainder*.c: remove useless long double castnsz-15/+6
2012-03-19don't try to create non-standard denormalization signalnsz-7/+4
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.
2012-03-19Merge remote branch 'nsz/master'Rich Felker-80/+3
2012-03-19new modff.c code, fix nan handling in modflnsz-44/+26
2012-03-19use scalbn or *2.0 instead of ldexp, fix fmalnsz-101/+102
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.
2012-03-19fix long double const workaround in cbrtlnsz-5/+1
2012-03-19don't inline __rem_pio2l so the code size is smallernsz-9/+2
2012-03-19minor fix in __tanl (get sign properly)nsz-2/+1
2012-03-19bug fix: wrong opcode for writing long longRich Felker-2/+2
2012-03-19remove long double const workaroundsnsz-79/+2
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).
2012-03-19fix erfl wrapper for long double==double casensz-1/+1
2012-03-19asm for log1pRich Felker-0/+45
2012-03-19asm for log2Rich Felker-0/+21
2012-03-19asm for remquoRich Felker-0/+43
this could perhaps use some additional testing for corner cases, but it seems to be correct.
2012-03-19optimize exponential asm for i386Rich Felker-58/+77
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).
2012-03-19Merge remote branch 'nsz/master'Rich Felker-163/+208
2012-03-19fix broken modf family functionsRich Felker-27/+66
2012-03-19asm for modf functionsRich Felker-0/+45
2012-03-19simplify scalbn*.c implementationsnsz-152/+65
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)
2012-03-19Merge branch 'master' of git://
2012-03-19asm for floor/ceil/truncRich Felker-0/+75
2012-03-19Merge branch 'master' of git://
2012-03-19asm for scalbn familyRich Felker-0/+64
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.
2012-03-19asm for inverse trig functionsRich Felker-0/+93
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.
2012-03-19Merge branch 'master' of git://
2012-03-18asm for log functionsRich Felker-0/+42
2012-03-18fix broken exponential asmRich Felker-1/+21
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.
2012-03-18asm for lrint family on i386Rich Felker-0/+46
2012-03-19Merge branch 'master' of git://
2012-03-18asm exponential functions for i386Rich Felker-0/+89
2012-03-19remove unnecessary TODO comments from fma.cnsz-5/+1
2012-03-19fmal bug fix: nan input should not raise exceptionnsz-4/+4
2012-03-19add fma implementation for x86nsz-7/+143
correctly rounded double precision fma using extended precision arithmetics for ld80 systems (x87)
2012-03-18assembly optimizations for fmod/remainder functionsRich Felker-0/+88
2012-03-18asm versions of some simple math functions for i386 and x86_64Rich Felker-0/+48
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.
2012-03-18simplify lround and llround functionsnsz-112/+20
Simple wrappers around round is enough because spurious inexact exception is allowed.
2012-03-18make lrint and llrint functions work without fenv supportnsz-6/+16
2012-03-18faster lrint and llrint functionsnsz-80/+99
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.
2012-03-18fix loads of missing const in new libm, and some global vars (?!) in powlRich Felker-51/+51
2012-03-17move nonstandard gamma() etc. to _GNU_SOURCE onlyRich Felker-4/+4
it's not even provided in the library at the moment, but could easily be provided with weak aliases if desired.
2012-03-17c++ seems to want some casts in the float representation-access macrosRich Felker-2/+2
2012-03-17release notes for 0.8.7v0.8.7Rich Felker-0/+24
2012-03-17try fixing/optimizing x86_64 fenv exception codeRich Felker-18/+23
untested; may need followup-fixes.
2012-03-17optimize x86 feclearexceptRich Felker-16/+20
if all exception flags will be cleared, we can avoid the expensive store/reload of the environment and just use the fnclex instruction.
2012-03-17fix x86_64 fe[gs]etround, analogous to nsz's x86 changesRich Felker-8/+9