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re PR target/47643 (x86 -mtune docs still imply i386 is the default for codegen)

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PR target/47643
	* doc/invoke.texi (i386 and x86-64 Options): Fix description of
	-mtune without -march.

From-SVN: r182630
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Jonathan Wakely 2011-12-22 17:35:05 +00:00 committed by Jonathan Wakely
parent 444880b9b1
commit d7816baac9
2 changed files with 10 additions and 2 deletions
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gcc/ChangeLog
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@ -1,3 +1,9 @@
2011-12-22 Jonathan Wakely <jwakely.gcc@gmail.com>
PR target/47643
* doc/invoke.texi (i386 and x86-64 Options): Fix description of
-mtune without -march.
2011-12-21 Richard Earnshaw <rearnsha@arm.com>
PR target/51643

6
gcc/doc/invoke.texi
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@ -12847,8 +12847,10 @@ Embedded AMD CPU with MMX and 3DNow!@: instruction set support.
While picking a specific @var{cpu-type} will schedule things appropriately
for that particular chip, the compiler will not generate any code that
does not run on the i386 without the @option{-march=@var{cpu-type}} option
being used.
does not run on the default machine type without the @option{-march=@var{cpu-type}}
option being used. For example, if GCC is configured for i686-pc-linux-gnu
then @option{-mtune=pentium4} will generate code that is tuned for Pentium4
but will still run on i686 machines.
@item -march=@var{cpu-type}
@opindex march