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Dave Love's Intel-related doc fixes

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From-SVN: r27375
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Craig Burley 1999-06-05 15:16:18 +00:00 committed by Craig Burley
parent db1421c77b
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4 changed files with 25 additions and 18 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
Sat Jun 5 17:04:16 1999 Craig Burley <craig@jcb-sc.com>
From Dave Love to egcs-patches on 20 May 1999 17:38:38 +0100:
* invoke.texi: Clarify text vis-a-vis Intel CPUs.
Sat Jun 5 12:11:24 1999 Mark Mitchell <mark@codesourcery.com>
* mips.h (mips_output_conditional_branch): New function.

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gcc/f/ChangeLog
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Sat Jun 5 17:03:23 1999 Craig Burley <craig@jcb-sc.com>
From Dave Love to egcs-patches on 20 May 1999 17:38:38 +0100:
* g77.texi: Clean up fossil text vis-a-vis Intel CPUs.
Fri Jun 4 13:56:56 1999 Craig Burley <craig@jcb-sc.com>
* Make-lang.in: Use libsubdir, not prefix, to store

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gcc/f/g77.texi
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@ -10774,30 +10774,25 @@ compiler, typically @code{gcc}.)
@node Use Submodel Options
@subsection Use Submodel Options
@cindex Pentium optimizations
@cindex optimization, for Pentium
@cindex 586/686 CPUs
@cindex submodels
Using an appropriate @samp{-m} option to generate specific code for your
CPU may be worthwhile, though it may mean the executable won't run on
other versions of the CPU that don't support the same instruction set.
@xref{Submodel Options,,Hardware Models and Configurations,gcc,Using and
Porting GNU CC}.
Porting GNU CC}. For instance on an x86 system the compiler might have
been built---as shown by @samp{g77 -v}---for the target
@samp{i386-pc-linux-gnu}, i.e.@: an @samp{i386} CPU@. In that case to
generate code best optimized for a Pentium you could use the option
@samp{-march=pentium}.
For recent CPUs that don't have explicit support in
the released version of @code{gcc}, it may still be possible to get
improvements.
For instance, the flags recommended for 586/686
(Pentium(Pro)) chips for building the Linux kernel are:
For recent CPUs that don't have explicit support in the released version
of @code{gcc}, it @emph{might} still be possible to get improvements
with certain @samp{-m} options.
@smallexample
-m486 -malign-loops=2 -malign-jumps=2 -malign-functions=2
-fomit-frame-pointer
@end smallexample
@noindent @samp{-fomit-frame-pointer} will, however, inhibit debugging
on x86 systems.
@samp{-fomit-frame-pointer} can help performance on x86 systems and
others. It will, however, inhibit debugging on the systems on which it
is not turned on anyway by @samp{-O}.
@node Trouble
@chapter Known Causes of Trouble with GNU Fortran

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gcc/invoke.texi
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@ -5044,7 +5044,9 @@ instructions. The choices for @var{cpu type} are:
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 @samp{-march=@var{cpu type}} option
being used.
being used. @samp{i586} is equivalent to @samp{pentium} and @samp{i686}
is equivalent to @samp{pentiumpro}. @samp{k6} is the AMD chip as
opposed to the Intel ones.
@item -march=@var{cpu type}
Generate instructions for the machine type @var{cpu type}. The choices
@ -5056,7 +5058,7 @@ specifying @samp{-march=@var{cpu type}} implies @samp{-mcpu=@var{cpu type}}.
@itemx -mpentium
@itemx -mpentiumpro
Synonyms for -mcpu=i386, -mcpu=i486, -mcpu=pentium, and -mcpu=pentiumpro
respectively. These synonyms are depricated.
respectively. These synonyms are deprecated.
@item -mieee-fp
@itemx -mno-ieee-fp