[PATCH][PING] Inline C99 math functions

[Andreas Schwab]

"Wilco Dijkstra" <wdijkstr@arm.com> writes:

>> Wilco Dijkstra wrote:
>> Add inlining of the C99 math functions isinf/isnan/signbit/isfinite/isnormal/fpclassify using
>> GCC built-ins when available. Since going through the PLT is expensive for these small
>> functions, inlining results in major speedups (about 7x on Cortex-A57 for isinf). The GCC
>> built-ins are not correct if signalling NaN support is required, and thus are turned off in
>> that case (see GCC bug 66462). The test-snan.c tests sNaNs and so must be explicitly built
>> with -fsignaling-nans.
>> 
>> As a result of this many target overrides and the various __isnan/__finite inlines in
>> math_private.h are no longer required. If agreed we could remove all this code and only keep
>> the generic definition of isinf/etc which will use the builtin.
>> 
>> Tested on AArch64. OK for commit?

FAIL: elf/check-localplt
$ cat elf/check-localplt.out 
Missing required PLT reference: libm.so: __signbitl
Missing required PLT reference: libc.so: __signbitl
Missing required PLT reference: libm.so: __signbitf
Missing required PLT reference: libm.so: __signbit
Missing required PLT reference: libc.so: __signbit

Andreas.

-- 
Andreas Schwab, SUSE Labs, schwab@suse.de
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