From 7001ee2d42a6a5e92cb7c40f96616dcdf1ebc3dd Mon Sep 17 00:00:00 2001 From: Craig Burley Date: Sat, 5 Jun 1999 15:16:18 +0000 Subject: [PATCH] Dave Love's Intel-related doc fixes From-SVN: r27375 --- gcc/ChangeLog | 5 +++++ gcc/f/ChangeLog | 5 +++++ gcc/f/g77.texi | 31 +++++++++++++------------------ gcc/invoke.texi | 6 ++++-- 4 files changed, 27 insertions(+), 20 deletions(-) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 477f7032869..1b8a40dcae3 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +Sat Jun 5 17:04:16 1999 Craig Burley + + 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 * mips.h (mips_output_conditional_branch): New function. diff --git a/gcc/f/ChangeLog b/gcc/f/ChangeLog index dee59a3c158..d8f51ab429a 100644 --- a/gcc/f/ChangeLog +++ b/gcc/f/ChangeLog @@ -1,3 +1,8 @@ +Sat Jun 5 17:03:23 1999 Craig Burley + + 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 * Make-lang.in: Use libsubdir, not prefix, to store diff --git a/gcc/f/g77.texi b/gcc/f/g77.texi index fb393a01cd8..cd945e9be1a 100644 --- a/gcc/f/g77.texi +++ b/gcc/f/g77.texi @@ -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}. - -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: - -@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. +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 @emph{might} still be possible to get improvements +with certain @samp{-m} options. + +@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 diff --git a/gcc/invoke.texi b/gcc/invoke.texi index 4aecc14c93c..ad10f40072d 100644 --- a/gcc/invoke.texi +++ b/gcc/invoke.texi @@ -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 -- 2.30.2