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expr.c: Corrected comment about what MOVE_RATIO does. 

* expr.c: Corrected comment about what MOVE_RATIO does.
        * config/alpha/alpha.h: Ditto.
        * config/1750a/1750a.h: Ditto.
        * config/clipper/clipper.h: Ditto.
        * config/i386/i386.h: Ditto.

From-SVN: r22339
This commit is contained in:
Hans-Peter Nilsson 1998-09-09 00:48:00 +02:00 committed by Jeff Law
parent 4746e092cc
commit 7e24ffc924
6 changed files with 25 additions and 13 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
Tue Sep 8 23:46:04 1998 Hans-Peter Nilsson <hp@axis.se>
* expr.c: Corrected comment about what MOVE_RATIO does.
* config/alpha/alpha.h: Ditto.
* config/1750a/1750a.h: Ditto.
* config/clipper/clipper.h: Ditto.
* config/i386/i386.h: Ditto.
Tue Sep 8 22:56:12 1998 Jeffrey A Law (law@cygnus.com)
* configure.in (m68k-next-nextstep3*): Use collect2.

4
gcc/config/1750a/1750a.h
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@ -854,8 +854,8 @@ enum reg_class { NO_REGS, R2, R0_1, INDEX_REGS, BASE_REGS, ALL_REGS, LIM_REG_CLA
in one reasonably fast instruction. */
#define MOVE_MAX 65536
/* MOVE_RATIO is the number of move instructions that is better than a
block move. */
/* If a memory-to-memory move would take MOVE_RATIO or more simple
move-instruction pairs, we will do a movstr or libcall instead. */
#define MOVE_RATIO 4
/* Define this if zero-extension is slow (more than one real instruction). */

8
gcc/config/alpha/alpha.h
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@ -1586,9 +1586,11 @@ do { \
#define MOVE_MAX 8
/* Controls how many units are moved by expr.c before resorting to movstr.
Without byte/word accesses, we want no more than one; with, several single
byte accesses are better. */
/* If a memory-to-memory move would take MOVE_RATIO or more simple
move-instruction pairs, we will do a movstr or libcall instead.
Without byte/word accesses, we want no more than four instructions;
with, several single byte accesses are better. */
#define MOVE_RATIO (TARGET_BWX ? 7 : 2)

6
gcc/config/clipper/clipper.h
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@ -815,8 +815,10 @@ do \
in one reasonably fast instruction. */
#define MOVE_MAX 4
/* MOVE_RATIO is the number of move instructions that is better than a
block move. Make this large on clipper, since the block move is very
/* If a memory-to-memory move would take MOVE_RATIO or more simple
move-instruction pairs, we will do a movstr or libcall instead.
Make this large on clipper, since the block move is very
inefficient with small blocks, and the hard register needs of the
block move require much reload work. */

8
gcc/config/i386/i386.h
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@ -1890,10 +1890,10 @@ while (0)
in one reasonably fast instruction. */
#define MOVE_MAX 4
/* The number of scalar move insns which should be generated instead
of a string move insn or a library call. Increasing the value
will always make code faster, but eventually incurs high cost in
increased code size.
/* If a memory-to-memory move would take MOVE_RATIO or more simple
move-instruction pairs, we will do a movstr or libcall instead.
Increasing the value will always make code faster, but eventually
incurs high cost in increased code size.
If you don't define this, a reasonable default is used.

4
gcc/expr.c
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@ -203,8 +203,8 @@ static rtx do_store_flag PROTO((tree, rtx, enum machine_mode, int));
static char direct_load[NUM_MACHINE_MODES];
static char direct_store[NUM_MACHINE_MODES];
/* MOVE_RATIO is the number of move instructions that is better than
a block move. */
/* If a memory-to-memory move would take MOVE_RATIO or more simple
move-instruction sequences, we will do a movstr or libcall instead. */
#ifndef MOVE_RATIO
#if defined (HAVE_movstrqi) || defined (HAVE_movstrhi) || defined (HAVE_movstrsi) || defined (HAVE_movstrdi) || defined (HAVE_movstrti)