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| author | Aldy Hernandez <aldyh@redhat.com> | 2001-01-15 22:45:32 +0000 |
|---|---|---|
| committer | Aldy Hernandez <aldyh@gcc.gnu.org> | 2001-01-15 22:45:32 +0000 |
| commit | 3ff51205709ba6abfcd537ac635b4c0085c51db7 (patch) | |
| tree | 23385eb6895de7d47672c7ceb1816b55800119ee /gcc | |
| parent | 3cf96b52a1ff56ba9fe091fb3d19e4e86aa8c27c (diff) | |
| download | gcc-3ff51205709ba6abfcd537ac635b4c0085c51db7.zip gcc-3ff51205709ba6abfcd537ac635b4c0085c51db7.tar.gz gcc-3ff51205709ba6abfcd537ac635b4c0085c51db7.tar.bz2 | |
new option to disable guessing of branch prediction
From-SVN: r39052
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 10 | ||||
| -rw-r--r-- | gcc/flags.h | 3 | ||||
| -rw-r--r-- | gcc/toplev.c | 9 |
3 files changed, 21 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 7e99053..1c3f698 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,13 @@ +2001-01-12 Aldy Hernandez <aldyh@redhat.com> + + * toplev.c (flag_guess_branch_prob): New. + (f_options): Add guess-branch-probability option. + (rest_of_decl_compilation): Only estimate branch probability if + flag set. + (main): set flag_guess_branch_prob. + + * flags.h (flag_guess_branch_prob): New. + 2001-01-15 DJ Delorie <dj@redhat.com> * gcc.texi (Makefile): Add documentation for Makefile targets. diff --git a/gcc/flags.h b/gcc/flags.h index fc19efe..99678ba 100644 --- a/gcc/flags.h +++ b/gcc/flags.h @@ -531,6 +531,9 @@ extern int flag_instrument_function_entry_exit; /* Perform a peephole pass before sched2. */ extern int flag_peephole2; +/* Try to guess branch probablities. */ +extern int flag_guess_branch_prob; + /* -fbounded-pointers causes gcc to compile pointers as composite objects occupying three words: the pointer value, the base address of the referent object, and the address immediately beyond the end diff --git a/gcc/toplev.c b/gcc/toplev.c index 408f04a..5134361 100644 --- a/gcc/toplev.c +++ b/gcc/toplev.c @@ -868,6 +868,9 @@ int flag_no_ident = 0; /* This will perform a peephole pass before sched2. */ int flag_peephole2 = 0; +/* This will try to guess branch probabilities. */ +int flag_guess_branch_prob = 0; + /* -fbounded-pointers causes gcc to compile pointers as composite objects occupying three words: the pointer value, the base address of the referent object, and the address immediately beyond the end @@ -1136,6 +1139,8 @@ lang_independent_options f_options[] = "Process #ident directives"}, { "peephole2", &flag_peephole2, 1, "Enables an rtl peephole pass run before sched2" }, + { "guess-branch-probability", &flag_guess_branch_prob, 1, + "Enables guessing of branch probabilities" }, {"math-errno", &flag_errno_math, 1, "Set errno after built-in math functions"}, {"bounded-pointers", &flag_bounded_pointers, 1, @@ -3253,7 +3258,8 @@ rest_of_compilation (decl) flow_loops_find (&loops, LOOP_TREE); /* Estimate using heuristics if no profiling info is available. */ - estimate_probability (&loops); + if (flag_guess_branch_prob) + estimate_probability (&loops); if (rtl_dump_file) flow_loops_dump (&loops, rtl_dump_file, NULL, 0); @@ -4636,6 +4642,7 @@ main (argc, argv) #ifdef CAN_DEBUG_WITHOUT_FP flag_omit_frame_pointer = 1; #endif + flag_guess_branch_prob = 1; } if (optimize >= 2) |