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cfgcleanup.c: Include params.h.

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* cfgcleanup.c: Include params.h.
        (try_crossjump_bb): Use PARAM_MAX_CROSSJUMP_EDGES.  Fix test for
        too many outgoing edges from a block.
        * Makefile.in (cfgcleanup.o): Depend on PARAMS_H.
        * params.def (max-crossjump-edges): New.
        * doc/invoke.texi: Document it.

From-SVN: r62942
This commit is contained in:
Richard Henderson 2003-02-15 13:06:16 -08:00 • committed by Richard Henderson
parent 9381bbc998
commit 5f24e0dcf6
5 changed files with 34 additions and 8 deletions
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9
gcc/ChangeLog
View file

@ -1,3 +1,12 @@
2003-02-15 Richard Henderson <rth@redhat.com>
* cfgcleanup.c: Include params.h.
(try_crossjump_bb): Use PARAM_MAX_CROSSJUMP_EDGES. Fix test for
too many outgoing edges from a block.
* Makefile.in (cfgcleanup.o): Depend on PARAMS_H.
* params.def (max-crossjump-edges): New.
* doc/invoke.texi: Document it.
2003-02-15 Richard Henderson <rth@redhat.com>
* recog.c (split_all_insns): Include new blocks in life update;

7
gcc/Makefile.in
View file

@ -1593,9 +1593,10 @@ cfganal.o : cfganal.c $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) $(RTL_H) \
cfgbuild.o : cfgbuild.c $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) $(RTL_H) flags.h \
insn-config.h $(BASIC_BLOCK_H) $(REGS_H) hard-reg-set.h output.h toplev.h $(RECOG_H) \
function.h except.h $(GGC_H)
cfgcleanup.o : cfgcleanup.c $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) $(RTL_H) \
$(TIMEVAR_H) $(BASIC_BLOCK_H) hard-reg-set.h output.h flags.h $(RECOG_H) toplev.h \
$(GGC_H) insn-config.h cselib.h $(TARGET_H) $(TM_P_H)
cfgcleanup.o : cfgcleanup.c $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) \
$(RTL_H) $(TIMEVAR_H) $(BASIC_BLOCK_H) hard-reg-set.h output.h flags.h \
$(RECOG_H) toplev.h $(GGC_H) insn-config.h cselib.h $(TARGET_H) $(TM_P_H) \
$(PARAMS_H)
cfgloop.o : cfgloop.c $(CONFIG_H) $(SYSTEM_H) $(RTL_H) coretypes.h $(TM_H) \
$(BASIC_BLOCK_H) hard-reg-set.h cfgloop.h flags.h
cfgloopanal.o : cfgloopanal.c $(CONFIG_H) $(SYSTEM_H) $(RTL_H) \

13
gcc/cfgcleanup.c
View file

@ -45,6 +45,7 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA
#include "recog.h"
#include "toplev.h"
#include "cselib.h"
#include "params.h"
#include "tm_p.h"
#include "target.h"
@ -1464,7 +1465,7 @@ try_crossjump_bb (mode, bb)
{
edge e, e2, nexte2, nexte, fallthru;
bool changed;
int n = 0;
int n = 0, max;
/* Nothing to do if there is not at least two incoming edges. */
if (!bb->pred || !bb->pred->pred_next)
@ -1473,11 +1474,13 @@ try_crossjump_bb (mode, bb)
/* It is always cheapest to redirect a block that ends in a branch to
a block that falls through into BB, as that adds no branches to the
program. We'll try that combination first. */
for (fallthru = bb->pred; fallthru; fallthru = fallthru->pred_next, n++)
fallthru = NULL;
max = PARAM_VALUE (PARAM_MAX_CROSSJUMP_EDGES);
for (e = bb->pred; e ; e = e->pred_next, n++)
{
if (fallthru->flags & EDGE_FALLTHRU)
break;
if (n > 100)
if (e->flags & EDGE_FALLTHRU)
fallthru = e;
if (n > max)
return false;
}

7
gcc/doc/invoke.texi
View file

@ -4346,6 +4346,13 @@ In each case, the @var{value} is an integer. The allowable choices for
@var{name} are given in the following table:
@table @gcctabopt
@item max-crossjump-edges
The maximum number of incoming edges to consider for crossjumping.
The algorithm used by @option(-fcrossjumping) is @math{O(N^2)} in
the number of edges incoming to each block. Increasing values mean
more aggressive optimization, making the compile time increase with
probably small improvement in executable size.
@item max-delay-slot-insn-search
The maximum number of instructions to consider when looking for an
instruction to fill a delay slot. If more than this arbitrary number of

6
gcc/params.def
View file

@ -202,6 +202,12 @@ DEFPARAM(TRACER_MIN_BRANCH_PROBABILITY,
this threshold (in percents). Used when profile feedback is not available",
50)
/* The maximum number of incoming edges to consider for crossjumping. */
DEFPARAM(PARAM_MAX_CROSSJUMP_EDGES,
"max-crossjump-edges",
"The maximum number of incoming edges to consider for crossjumping",
100)
#ifdef ENABLE_GC_ALWAYS_COLLECT
# define GGC_MIN_EXPAND_DEFAULT 0
# define GGC_MIN_HEAPSIZE_DEFAULT 0