[flac-dev] [PATCH] simplify OS SSE support detection

lvqcl lvqcl.mail at gmail.com
Sun Jul 27 05:11:52 PDT 2014

This patch tries to simplify the code that tries to detect
whether OS supports SSE instructions.

a) Linux: "old" vs "new" sigaction

OBSOLETE_SIGCONTEXT_FLAVOR was disabled in Mar 2007 in commit
According to <http://unixhelp.ed.ac.uk/CGI/man-cgi?sigaction>:
"Support for SA_SIGINFO was added in Linux 2.2" (released in Jan 1999).
If noone wants to use FLAC with Linux kernel 2.0 then it's safe to
delete this code.

b) MSVC: try/catch vs. sigill_handler

TRY_CATCH_FLAVOR was enabled in Jan 2009 in commit
According to the comment in cpu.c, "sigill_handler flavor resulted in
several crash reports on win32". Also this sigill_handler flavor is not thread-safe.

c) MinGW: fxsave/fxrestore vs. sigill_handler

The code was added Mar 2014 in commit
It's better to use FXSR flavor instead of sigill_handler flavor. The reasons
are the same as for MSVC.
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