| Age | Commit message (Collapse) | Author | Lines |
|---|
| 2019年04月17日 | math: new exp2f and expf | Szabolcs Nagy | -111/+54 |
|
from https://github.com/ARM-software/optimized-routines,
commit 04884bd04eac4b251da4026900010ea7d8850edc
In expf TOINT_INTRINSICS is kept, but is unused, it would require support
for __builtin_round and __builtin_lround as single instruction.
code size change: +94 bytes.
benchmark on x86_64 before, after, speedup:
-Os:
expf rthruput: 9.19 ns/call 8.11 ns/call 1.13x
expf latency: 34.19 ns/call 18.77 ns/call 1.82x
exp2f rthruput: 5.59 ns/call 6.52 ns/call 0.86x
exp2f latency: 17.93 ns/call 16.70 ns/call 1.07x
-O3:
expf rthruput: 9.12 ns/call 4.92 ns/call 1.85x
expf latency: 34.44 ns/call 18.99 ns/call 1.81x
exp2f rthruput: 5.58 ns/call 4.49 ns/call 1.24x
exp2f latency: 17.95 ns/call 16.94 ns/call 1.06x
|
| 2016年03月04日 | math: fix expf(-NAN) and exp2f(-NAN) to return -NAN instead of 0 | Szabolcs Nagy | -0/+2 |
|
expf(-NAN) was treated as expf(-large) which unconditionally
returns +0, so special case +-NAN.
reported by Petr Hosek.
|
| 2013年09月06日 | math: remove STRICT_ASSIGN from exp2f (see previous commit) | Szabolcs Nagy | -1/+1 |
|
| 2013年09月05日 | math: fix underflow in exp*.c and long double handling in exp2l | Szabolcs Nagy | -28/+24 |
|
* don't care about inexact flag
* use double_t and float_t (faster, smaller, more precise on x86)
* exp: underflow when result is zero or subnormal and not -inf
* exp2: underflow when result is zero or subnormal and not exact
* expm1: underflow when result is zero or subnormal
* expl: don't underflow on -inf
* exp2: fix incorrect comment
* expm1: simplify special case handling and overflow properly
* expm1: cleanup final scaling and fix negative left shift ub (twopk)
|
| 2012年12月16日 | math: use 0x1p-120f and 0x1p120f for tiny and huge values | Szabolcs Nagy | -2/+2 |
|
previously 0x1p-1000 and 0x1p1000 was used for raising inexact
exception like x+tiny (when x is big) or x+huge (when x is small)
the rational is that these float consts are large enough
(0x1p-120 + 1 raises inexact even on ld128 which has 113 mant bits)
and float consts maybe smaller or easier to load on some platforms
(on i386 this reduced the object file size by 4bytes in some cases)
|
| 2012年11月17日 | math: cleanup exp2.c exp2f.c and exp2l.c | Szabolcs Nagy | -16/+14 |
|
* old code relied on sign extension on right shift
* exp2l ld64 wrapper was wrong
* use scalbn instead of bithacks
|
| 2012年03月18日 | fix loads of missing const in new libm, and some global vars (?!) in powl | Rich Felker | -1/+1 |
|
| 2012年03月13日 | first commit of the new libm! | Rich Felker | -0/+130 |
|
thanks to the hard work of Szabolcs Nagy (nsz), identifying the best
(from correctness and license standpoint) implementations from freebsd
and openbsd and cleaning them up! musl should now fully support c99
float and long double math functions, and has near-complete complex
math support. tgmath should also work (fully on gcc-compatible
compilers, and mostly on any c99 compiler).
based largely on commit 0376d44a890fea261506f1fc63833e7a686dca19 from
nsz's libm git repo, with some additions (dummy versions of a few
missing long double complex functions, etc.) by me.
various cleanups still need to be made, including re-adding (if
they're correct) some asm functions that were dropped.
|