From 7506f49132276e0bd064a169dca106b6436bde7c Mon Sep 17 00:00:00 2001
From: Doug Evans <devans@cygnus.com>
Date: Wed, 20 May 1998 00:24:32 +0000
Subject: * Global CSE and constant/copy propagation.
* Makefile.in (OBJS): Add gcse.o
(STAGESTUFF): Add *.gcse.
(gcse.o): Add dependencies.
(mostlyclean): Remove *.gcse and */*.gcse.
* gcse.c: New file.
* loop.c (loop_optimize): Move call to init_alias_analysis.
* recog.c (validate_replace_src): New function.
* toplev.c (gcse_dump): New global variable.
(flag_gcse, gcse_time): Likewise.
(compile_file): Initialize gcse_time and clean out the gcse dump
file if necessary.
(rest_of_compilation): Call gcse_main as requested. Dump RTL
after gcse if requested.
(main): Enable gcse for -O2 and above. Handle -dG. Enable gcse
dumps for -da.
* gcc.texi: Add gcse related internal documentation.
* invoke.texi: Note new command line options for gcse.
* tm.texi: Document AVOID_CCMODE_COPIES.
* mips.h (AVOID_CCMODE_COPIES): Define.
Co-Authored-By: Jeffrey A Law <law@cygnus.com>
From-SVN: r19901
---
gcc/toplev.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
(limited to 'gcc/toplev.c')
diff --git a/gcc/toplev.c b/gcc/toplev.c
index 2542d1a23f2..ecd11f9b66a 100644
--- a/gcc/toplev.c
+++ b/gcc/toplev.c
@@ -267,6 +267,7 @@ int rtl_dump_and_exit = 0;
int jump_opt_dump = 0;
int addressof_dump = 0;
int cse_dump = 0;
+int gcse_dump = 0;
int loop_dump = 0;
int cse2_dump = 0;
int branch_prob_dump = 0;
@@ -538,6 +539,10 @@ int flag_volatile_global;
int flag_syntax_only = 0;
+/* Nonzero means perform global cse. */
+
+static int flag_gcse;
+
/* Nonzero means to rerun cse after loop optimization. This increases
compilation time about 20% and picks up a few more common expressions. */
@@ -738,6 +743,7 @@ struct { char *string; int *variable; int on_value;} f_options[] =
{"pcc-struct-return", &flag_pcc_struct_return, 1},
{"reg-struct-return", &flag_pcc_struct_return, 0},
{"delayed-branch", &flag_delayed_branch, 1},
+ {"gcse", &flag_gcse, 1},
{"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1},
{"rerun-loop-opt", &flag_rerun_loop_opt, 1},
{"pretend-float", &flag_pretend_float, 1},
@@ -977,6 +983,7 @@ int varconst_time;
int integration_time;
int jump_time;
int cse_time;
+int gcse_time;
int loop_time;
int cse2_time;
int branch_prob_time;
@@ -2274,6 +2281,7 @@ compile_file (name)
integration_time = 0;
jump_time = 0;
cse_time = 0;
+ gcse_time = 0;
loop_time = 0;
cse2_time = 0;
branch_prob_time = 0;
@@ -2360,6 +2368,8 @@ compile_file (name)
if (dbr_sched_dump)
clean_dump_file (".dbr");
#endif
+ if (gcse_dump)
+ clean_dump_file (".gcse");
#ifdef STACK_REGS
if (stack_reg_dump)
clean_dump_file (".stack");
@@ -2840,6 +2850,7 @@ compile_file (name)
print_time ("integration", integration_time);
print_time ("jump", jump_time);
print_time ("cse", cse_time);
+ print_time ("gcse", gcse_time);
print_time ("loop", loop_time);
print_time ("cse2", cse2_time);
print_time ("branch-prob", branch_prob_time);
@@ -3257,6 +3268,18 @@ rest_of_compilation (decl)
if (addressof_dump)
dump_rtl (".addressof", decl, print_rtl, insns);
+ /* Perform global cse. */
+
+ if (optimize > 0 && flag_gcse)
+ {
+ if (gcse_dump)
+ open_dump_file (".gcse", IDENTIFIER_POINTER (DECL_NAME (decl)));
+
+ TIMEVAR (gcse_time, gcse_main (insns, rtl_dump_file));
+
+ if (gcse_dump)
+ close_dump_file (print_rtl, insns);
+ }
/* Move constant computations out of loops. */
if (optimize > 0)
@@ -3801,6 +3824,7 @@ main (argc, argv, envp)
{
flag_cse_follow_jumps = 1;
flag_cse_skip_blocks = 1;
+ flag_gcse = 1;
flag_expensive_optimizations = 1;
flag_strength_reduce = 1;
flag_rerun_cse_after_loop = 1;
@@ -3879,6 +3903,7 @@ main (argc, argv, envp)
regmove_dump = 1;
rtl_dump = 1;
cse_dump = 1, cse2_dump = 1;
+ gcse_dump = 1;
sched_dump = 1;
sched2_dump = 1;
#ifdef STACK_REGS
@@ -3911,6 +3936,9 @@ main (argc, argv, envp)
case 'g':
global_reg_dump = 1;
break;
+ case 'G':
+ gcse_dump = 1;
+ break;
case 'j':
jump_opt_dump = 1;
break;
--
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