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2013-10-28fenv: fix i386 fesetround for sseSzabolcs Nagy1-1/+1
i386 fenv code checks __hwcap for sse support, but in fesetround the sse code was unconditionally jumped over after the test so the sse rounding mode was never set.
2013-08-27fix invalid instruction mnemonics in powerpc fenv asmRich Felker1-3/+3
there is no non-dot version of the andis instruction, but there's no harm in updating the flags anyway, so just use the dot version.
2013-08-18fix fenv exception functions to mask their argumentSzabolcs Nagy8-18/+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
2013-08-18optimize x86 feclearexcept: only use save/restore x87 fenv if neededSzabolcs Nagy2-27/+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.
2013-08-18add sse fenv support on i386 through hwcapSzabolcs Nagy2-9/+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)
2013-08-18fix i386 fesetenv: FE_DFL_ENV is (fenv_t*)-1 not 0Szabolcs Nagy1-2/+2
2013-08-16support floating point environment (fenv) on armhf (hard float) subarchsRich Felker3-0/+62
patch by nsz. I've tested it on an armhf machine and it seems to be working correctly.
2012-11-18fenv support for ppc, untestedRich Felker1-0/+120
based on code sent to the mailing list by nsz, with minor changes.
2012-11-18fix feholdexcept -- it needs to clear exceptions after saving environmentRich Felker1-0/+1
2012-11-14fenv: return FE_TONEAREST in dummy fegetroundSzabolcs Nagy1-1/+1
2012-11-13math: use '#pragma STDC FENV_ACCESS ON' when fenv is accessedSzabolcs Nagy1-0/+1
2012-10-18floating point environment/exceptions support for mipsRich Felker1-0/+60
2012-03-17try fixing/optimizing x86_64 fenv exception codeRich Felker1-18/+23
untested; may need followup-fixes.
2012-03-17optimize x86 feclearexceptRich Felker1-16/+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 Felker1-8/+9
2012-03-17minor 387 fenv optimizationsRich Felker1-6/+5
2012-03-17fix i386 fegetround and make fesetround fasternsz1-10/+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).
2011-06-28use type directives for fenv asm functionsRich Felker2-0/+14
2011-06-13x86_64 fenv support (untested; at least known to build successfully)Rich Felker1-0/+88
2011-06-13fix fesetround - it was writing to status word instead of control wordRich Felker1-3/+8
2011-06-12floating point environment, untestedRich Felker6-0/+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.