This reduces -Og compile-time for the testcase in PR46590 from 116s
to 40s (still way short of -O0 compile-time which is 17s).
It does so by disabling the rest of loop2 (RTL invariant motion
and doloop) as I originally intended and by disabling PTA which
can get quite expensive on larger testcases (especially for
fortran which makes heavy use of fnspecs).
Bootstrap with BOOT_CFLAGS="-Og -g" on x86_64-unknown-linux-gnu
in progress.
Richard.
2014-01-17 Richard Biener <rguent...@suse.de>
PR tree-optimization/46590
* opts.c (default_options_table): Add entries for
OPT_fbranch_count_reg, OPT_fmove_loop_invariants and OPT_ftree_pta,
all enabled at -O1 but not for -Og.
* common.opt (fbranch-count-reg): Remove Init(1).
(fmove-loop-invariants): Likewise.
(ftree-pta): Likewise.
Index: gcc/opts.c
===================================================================
*** gcc/opts.c (revision 206702)
--- gcc/opts.c (working copy)
*************** static const struct default_options defa
*** 454,459 ****
--- 454,462 ----
{ OPT_LEVELS_1_PLUS, OPT_fcombine_stack_adjustments, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_fcompare_elim, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_ftree_slsr, NULL, 1 },
+ { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_fbranch_count_reg, NULL, 1 },
+ { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_fmove_loop_invariants, NULL, 1 },
+ { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_ftree_pta, NULL, 1 },
/* -O2 optimizations. */
{ OPT_LEVELS_2_PLUS, OPT_finline_small_functions, NULL, 1 },
Index: gcc/common.opt
===================================================================
*** gcc/common.opt (revision 206702)
--- gcc/common.opt (working copy)
*************** Common Report Var(flag_bounds_check)
*** 875,881 ****
Generate code to check bounds before indexing arrays
fbranch-count-reg
! Common Report Var(flag_branch_on_count_reg) Init(1) Optimization
Replace add, compare, branch with branch on count register
fbranch-probabilities
--- 875,881 ----
Generate code to check bounds before indexing arrays
fbranch-count-reg
! Common Report Var(flag_branch_on_count_reg) Optimization
Replace add, compare, branch with branch on count register
fbranch-probabilities
*************** Common Report Var(flag_modulo_sched_allo
*** 1564,1570 ****
Perform SMS based modulo scheduling with register moves allowed
fmove-loop-invariants
! Common Report Var(flag_move_loop_invariants) Init(1) Optimization
Move loop invariant computations out of loops
fdce
--- 1564,1570 ----
Perform SMS based modulo scheduling with register moves allowed
fmove-loop-invariants
! Common Report Var(flag_move_loop_invariants) Optimization
Move loop invariant computations out of loops
fdce
*************** Common Report Var(flag_tree_partial_pre)
*** 2170,2176 ****
In SSA-PRE optimization on trees, enable partial-partial redundancy
elimination
ftree-pta
! Common Report Var(flag_tree_pta) Init(1) Optimization
Perform function-local points-to analysis on trees.
ftree-reassoc
--- 2170,2176 ----
In SSA-PRE optimization on trees, enable partial-partial redundancy
elimination
ftree-pta
! Common Report Var(flag_tree_pta) Optimization
Perform function-local points-to analysis on trees.
ftree-reassoc
