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new option to disable guessing of branch prediction

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From-SVN: r39052
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Aldy Hernandez 2001-01-15 22:45:32 +00:00 committed by Aldy Hernandez
parent 3cf96b52a1
commit 3ff5120570
3 changed files with 21 additions and 1 deletions
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10
gcc/ChangeLog
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@ -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.

3
gcc/flags.h
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@ -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

9
gcc/toplev.c
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@ -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)