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* regmove.c (regmove_optimize): Avoid increasing of register pressure.

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From-SVN: r49864
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Jan Hubicka 2002-02-19 12:39:01 +01:00 committed by Jan Hubicka
parent 419a71d37c
commit fd973d5630
2 changed files with 19 additions and 11 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
Tue Feb 19 12:37:23 CET 2002 Jan Hubicka <jh@suse.cz>
* regmove.c (regmove_optimize): Avoid increasing of register pressure.
2002-02-19 Neil Booth <neil@daikokuya.demon.co.uk>
PR other/5718

26
gcc/regmove.c
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@ -1328,6 +1328,21 @@ regmove_optimize (f, nregs, regmove_dump_file)
}
src_class = reg_preferred_class (REGNO (src));
dst_class = reg_preferred_class (REGNO (dst));
if (! (src_note = find_reg_note (insn, REG_DEAD, src)))
{
/* We used to force the copy here like in other cases, but
it produces worse code, as it eliminates no copy
instructions and the copy emitted will be produced by
reload anyway. On patterns with multiple alternatives,
there may be better sollution availble.
In particular this change produced slower code for numeric
i387 programs. */
continue;
}
if (! regclass_compatible_p (src_class, dst_class))
{
if (!copy_src)
@ -1350,17 +1365,6 @@ regmove_optimize (f, nregs, regmove_dump_file)
continue;
}
if (! (src_note = find_reg_note (insn, REG_DEAD, src)))
{
if (!copy_src)
{
copy_src = src;
copy_dst = dst;
}
continue;
}
/* If src is set once in a different basic block,
and is set equal to a constant, then do not use
it for this optimization, as this would make it