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| author | Vladimir Makarov <vmakarov@redhat.com> | 2011-11-23 18:51:17 +0000 |
|---|---|---|
| committer | Vladimir Makarov <vmakarov@gcc.gnu.org> | 2011-11-23 18:51:17 +0000 |
| commit | ffe8727f47239229b1830f0a67921f8dc4c69b13 (patch) | |
| tree | 417f4807f2ac303fb2e45ded4d924d1d329be5e0 /gcc/doc/invoke.texi | |
| parent | 810fb8f1d6cadce0899872c310ebbae829d673dd (diff) | |
| download | gcc-ffe8727f47239229b1830f0a67921f8dc4c69b13.zip gcc-ffe8727f47239229b1830f0a67921f8dc4c69b13.tar.gz gcc-ffe8727f47239229b1830f0a67921f8dc4c69b13.tar.bz2 | |
re PR rtl-optimization/48455 (Huge code size regression for all ARM configurations)
2011-11-23 Vladimir Makarov <vmakarov@redhat.com>
PR rtl-optimization/48455
* doc/invoke.texi (-fira-region): Document default values.
* flags-types.h (enum ira_region): Add new value
IRA_REGION_AUTODETECT.
* common.opt (fira-region): Set up initial value to
IRA_REGION_AUTODETECT.
* toplev.c (process_options): Set up flag_ira_region depending on
-O options.
* ira.c (ira.c): Remove optimize guard for ira_build.
From-SVN: r181675
Diffstat (limited to 'gcc/doc/invoke.texi')
| -rw-r--r-- | gcc/doc/invoke.texi | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index e58ed1b..4e6edb9 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -6731,13 +6731,16 @@ rule generates a better code. Use specified regions for the integrated register allocator. The @var{region} argument should be one of @code{all}, @code{mixed}, or @code{one}. The first value means using all loops as register -allocation regions, the second value which is the default means using -all loops except for loops with small register pressure as the -regions, and third one means using all function as a single region. -The first value can give best result for machines with small size and -irregular register set, the third one results in faster and generates -decent code and the smallest size code, and the default value usually -give the best results in most cases and for most architectures. +allocation regions, the second value which is enabled by default when +compiling with optimization for speed (@option{-O}, @option{-O2}, +@dots{}) means using all loops except for loops with small register +pressure as the regions, and third one which is enabled by default for +@option{-Os} or @option{-O0} means using all function as a single +region. The first value can give best result for machines with small +size and irregular register set, the third one results in faster and +generates decent code and the smallest size code, and the second value +usually give the best results in most cases and for most +architectures. @item -fira-loop-pressure @opindex fira-loop-pressure |