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x86: Improve documentation for -msse4 [PR116708]

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gcc/ChangeLog
	PR target/116708
	* doc/invoke.texi (x86 Options): Clarify how -msse4 and -mno-sse4
	interact with other SSE options.
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Sandra Loosemore 2025-03-07 17:08:30 +00:00
parent 7deb498425
commit c781da2c10
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@ -35924,6 +35924,11 @@ These extensions are also available as built-in functions: see
@ref{x86 Built-in Functions}, for details of the functions enabled and
disabled by these switches.
Note that @option{-msse4} enables both SSE4.1 and SSE4.2 support,
while @option{-mno-sse4} turns off those features; neither form of the
option affects SSE4A support, controlled separately by
@option{-msse4a}.
To generate SSE/SSE2 instructions automatically from floating-point
code (as opposed to 387 instructions), see @option{-mfpmath=sse}.