musl - The musl libc tree (WIP / dev branches)

Age	Commit message (Collapse)	Author	Files	Lines
2013-08-18	fix fenv exception functions to mask their argument	Szabolcs Nagy	8	-18/+55
	fesetround.c is a wrapper to do the arch independent argument check (on archs where rounding mode is not stored in 2 bits __fesetround still has to check its arguments) on powerpc fe*except functions do not accept the extra invalid flags of its fpscr register the useless FENV_ACCESS pragma was removed from feupdateenv
2013-08-18	optimize x86 feclearexcept: only use save/restore x87 fenv if needed	Szabolcs Nagy	2	-27/+38
	the x87 exception summary (ES) and stack fault (SF) flags may be spuriously cleared by feclearexcept using the fnclex instruction, but these flags are not observable through libc hence maintaining their state is not critical.
2013-08-18	add sse fenv support on i386 through hwcap	Szabolcs Nagy	2	-9/+61
	the sse and x87 rounding modes should be always the same, the visible exception flags are the bitwise or of the two fenv states (so it's enough to query the rounding mode or raise exceptions on one fenv)
2013-08-18	fix i386 fesetenv: FE_DFL_ENV is (fenv_t*)-1 not 0	Szabolcs Nagy	1	-2/+2

2013-08-16	support floating point environment (fenv) on armhf (hard float) subarchs	Rich Felker	3	-0/+62
	patch by nsz. I've tested it on an armhf machine and it seems to be working correctly.
2012-11-18	fenv support for ppc, untested	Rich Felker	1	-0/+120
	based on code sent to the mailing list by nsz, with minor changes.
2012-11-18	fix feholdexcept -- it needs to clear exceptions after saving environment	Rich Felker	1	-0/+1

2012-11-14	fenv: return FE_TONEAREST in dummy fegetround	Szabolcs Nagy	1	-1/+1

2012-11-13	math: use '#pragma STDC FENV_ACCESS ON' when fenv is accessed	Szabolcs Nagy	1	-0/+1

2012-10-18	floating point environment/exceptions support for mips	Rich Felker	1	-0/+60

2012-03-17	try fixing/optimizing x86_64 fenv exception code	Rich Felker	1	-18/+23
	untested; may need followup-fixes.
2012-03-17	optimize x86 feclearexcept	Rich Felker	1	-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.
2012-03-17	fix x86_64 fe[gs]etround, analogous to nsz's x86 changes	Rich Felker	1	-8/+9

2012-03-17	minor 387 fenv optimizations	Rich Felker	1	-6/+5

2012-03-17	fix i386 fegetround and make fesetround faster	nsz	1	-10/+10
	Note that the new fesetround has slightly different semantics: Storing the floating-point environment with fnstenv makes the next fldenv (or fldcw) "non-signaling", so unmasked and pending exceptions does not invoke the exception handler. (These are rare since exceptions are handled immediately and by default all exceptions are masked anyway. But if one manually unmasks an exception in the control word then either sets the corresponding exception flag in the status word or the execution of an exception raising floating-point operation gets interrupted then it may happen). So the old implementation did not trap in some rare cases where the new implementation traps. However POSIX does not specify anything like the x87 exception handling traps and the fnstenv/fldenv pair is significantly slower than the fnstcw/fldcw pair (new code is about 5x faster here and it's dominated by the function call overhead).
2011-06-28	use type directives for fenv asm functions	Rich Felker	2	-0/+14

2011-06-13	x86_64 fenv support (untested; at least known to build successfully)	Rich Felker	1	-0/+88

2011-06-13	fix fesetround - it was writing to status word instead of control word	Rich Felker	1	-3/+8

2011-06-12	floating point environment, untested	Rich Felker	6	-0/+144
	at present the i386 code does not support sse floating point, which is not part of the standard i386 abi. while it may be desirable to support it later, doing so will reduce performance and require some tricks to probe if sse support is present. this first commit is i386-only, but it should be trivial to port the asm to x86_64.