Hi!
Currently -fsched-verbose option redirects debugging dumps to stderr
if there is no dump_file for the current pass. It would be fine if
there were the only scheduling pass. But for example for AArch64
there are 3 scheduling passes in the default pipeline: sched1,
fusion and sched2. So, when passing options like
-fsched-verbose=7 -fdump-rtl-sched1 to GCC I get a neat dump for
sched1 in the file and a mess of fusion/sched2 logs in the console.
In fact, currently there's no way to tell GCC that I want extremely
verbose logs for sched1 and I want no logs for all other passes.
Especially to the console.
I suggest disabling such redirection in the scheduler and omitting
debugging output for passes without dump_file. I believe a better
way to redirect printing to the stderr is to use options like
-fdump-rtl-sched=stderr. The attached patch implements the
suggestion.
Anyway, the old behavior may be reproduced with options
-fsched-verbose=7 -fdump-rtl-sched1 -fdump-rtl-{sched_fusion,sched2}=stderr
if it is really necessary.
The patch has been bootstrapped and regtested on x86_64.
Thanks,
Nikolai
2015-10-22 Nikolai Bozhenov <n.bozhe...@samsung.com>
* haifa-sched.c (setup_sched_dump): Don't redirect output to stderr.
* common.opt (-fsched-verbose): Set default value to 1.
* invoke.texi (-fsched-verbose): Update the option's description.
diff --git a/gcc/common.opt b/gcc/common.opt
index 224d3ad..5c23d29 100644
--- a/gcc/common.opt
+++ b/gcc/common.opt
@@ -1973,7 +1973,7 @@ Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
Allow speculative motion of more loads
fsched-verbose=
-Common RejectNegative Joined UInteger Var(sched_verbose_param)
+Common RejectNegative Joined UInteger Var(sched_verbose_param) Init(1)
-fsched-verbose=<number> Set the verbosity level of the scheduler
fsched2-use-superblocks
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 027ce96..d3cb88c 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -7403,12 +7403,7 @@ The @var{number} should be different for every file you compile.
@item -fsched-verbose=@var{n}
@opindex fsched-verbose
On targets that use instruction scheduling, this option controls the
-amount of debugging output the scheduler prints. This information is
-written to standard error, unless @option{-fdump-rtl-sched1} or
-@option{-fdump-rtl-sched2} is specified, in which case it is output
-to the usual dump listing file, @file{.sched1} or @file{.sched2}
-respectively. However for @var{n} greater than nine, the output is
-always printed to standard error.
+amount of debugging output the scheduler prints to the dump files.
For @var{n} greater than zero, @option{-fsched-verbose} outputs the
same information as @option{-fdump-rtl-sched1} and @option{-fdump-rtl-sched2}.
diff --git a/gcc/haifa-sched.c b/gcc/haifa-sched.c
index 46751fe..32506cb 100644
--- a/gcc/haifa-sched.c
+++ b/gcc/haifa-sched.c
@@ -206,17 +206,14 @@ static int modulo_last_stage;
/* sched-verbose controls the amount of debugging output the
scheduler prints. It is controlled by -fsched-verbose=N:
- N>0 and no -DSR : the output is directed to stderr.
- N>=10 will direct the printouts to stderr (regardless of -dSR).
- N=1: same as -dSR.
+ N=0: no debugging output.
+ N=1: default value.
N=2: bb's probabilities, detailed ready list info, unit/insn info.
N=3: rtl at abort point, control-flow, regions info.
N=5: dependences info. */
-
int sched_verbose = 0;
-/* Debugging file. All printouts are sent to dump, which is always set,
- either to stderr, or to the dump listing file (-dRS). */
+/* Debugging file. All printouts are sent to dump. */
FILE *sched_dump = 0;
/* This is a placeholder for the scheduler parameters common
@@ -7222,17 +7219,14 @@ set_priorities (rtx_insn *head, rtx_insn *tail)
return n_insn;
}
-/* Set dump and sched_verbose for the desired debugging output. If no
- dump-file was specified, but -fsched-verbose=N (any N), print to stderr.
- For -fsched-verbose=N, N>=10, print everything to stderr. */
+/* Set sched_dump and sched_verbose for the desired debugging output. */
void
setup_sched_dump (void)
{
sched_verbose = sched_verbose_param;
- if (sched_verbose_param == 0 && dump_file)
- sched_verbose = 1;
- sched_dump = ((sched_verbose_param >= 10 || !dump_file)
- ? stderr : dump_file);
+ sched_dump = dump_file;
+ if (!dump_file)
+ sched_verbose = 0;
}
/* Allocate data for register pressure sensitive scheduling. */
