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| author | Zdenek Dvorak <rakdver@atrey.karlin.mff.cuni.cz> | 2003-10-19 23:37:32 +0200 |
|---|---|---|
| committer | Zdenek Dvorak <rakdver@gcc.gnu.org> | 2003-10-19 21:37:32 +0000 |
| commit | fca9dc00583665bb89e63df672ba2f2184bb9ee6 (patch) | |
| tree | c3c61559cf453a985bdb4923c4ed4eae300f5c6d /gcc/doc | |
| parent | 47395a24e6a35ef07316b593fb17bf4d767707a7 (diff) | |
| download | gcc-fca9dc00583665bb89e63df672ba2f2184bb9ee6.zip gcc-fca9dc00583665bb89e63df672ba2f2184bb9ee6.tar.gz gcc-fca9dc00583665bb89e63df672ba2f2184bb9ee6.tar.bz2 | |
Makefile.in (toplev.o): Add value-prof.h dependency.
* Makefile.in (toplev.o): Add value-prof.h dependency.
(value-prof.o): Add REGS_H dependency.
* common.opt (fprofile-values, fvpt): New.
* flags.h (flag_value_profile_transformations): Declare.
* opts.c (common_handle_option): Handle -fprofile_values and
-fvpt.
* profile.c (branch_prob): Don't remove death notes here.
* timevar.def (TV_VPT): New.
* value-prof.c: Include regs.h.
(insn_divmod_values_to_profile, gen_divmod_fixed_value, gen_mod_pow2,
gen_mod_subtract, divmod_fixed_value_transform,mod_pow2_value_transform,
mod_subtract_transform, value_profile_transformations): New.
(insn_values_to_profile): Call insn_divmod_values_to_profile.
(find_values_to_profile): Add dumps.
* value-prof.h (value_profile_transformations): Declare.
* toplev.c: Include value-prof.h.
(rest_of_handle_value_profile_transformations): New.
(enum dump_file_index): Add DFI_vpt.
(dump_file): Add vpt dump.
(flag_value_profile_transformations): New.
(lang_independent_options): Add flag_profile_values and
flag_value_profile_transformations.
(rest_of_compilation): Call
rest_of_handle_value_profile_transformations.
(process_options): Let -fvpt imply -fprofile-values.
* doc/invoke.texi (-fvpt): Document.
From-SVN: r72685
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/invoke.texi | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index a154b7c..c99af2c 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -264,7 +264,7 @@ in the following sections. @xref{Optimize Options,,Options that Control Optimization}. @gccoptlist{-falign-functions=@var{n} -falign-jumps=@var{n} @gol -falign-labels=@var{n} -falign-loops=@var{n} @gol --fbranch-probabilities -fprofile-values -fbranch-target-load-optimize @gol +-fbranch-probabilities -fprofile-values -fvpt -fbranch-target-load-optimize @gol -fbranch-target-load-optimize2 -fcaller-saves -fcprop-registers @gol -fcse-follow-jumps -fcse-skip-blocks -fdata-sections @gol -fdelayed-branch -fdelete-null-pointer-checks @gol @@ -4564,6 +4564,16 @@ With @option{-fbranch-probabilities}, it reads back the data gathered from profiling values of expressions and adds @samp{REG_VALUE_PROFILE} notes to instructions for their later usage in optimizations. +@item -fvpt +@opindex fvpt +If combined with @option{-fprofile-arcs}, it instructs the compiler to add +a code to gather information about values of expressions. + +With @option{-fbranch-probabilities}, it reads back the data gathered +and actually performs the optimizations based on them. +Currently the optimizations include specialization of division operation +using the knowledge about the value of the denominator. + @item -fnew-ra @opindex fnew-ra Use a graph coloring register allocator. Currently this option is meant |