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h8300.c (two_insn_adds_subs_operand): Revise a comment.

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* config/h8300/h8300.c (two_insn_adds_subs_operand): Revise a
	comment.  Accept HImode only if TARGET_H8300.

From-SVN: r49597
This commit is contained in:
Kazu Hirata 2002-02-08 00:26:36 +00:00 committed by Kazu Hirata
parent 21e0995208
commit ae19f5ef34
2 changed files with 10 additions and 6 deletions
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gcc/ChangeLog
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@ -1,3 +1,8 @@
2002-02-07 Kazu Hirata <kazu@hxi.com>
* config/h8300/h8300.c (two_insn_adds_subs_operand): Revise a
comment. Accept HImode only if TARGET_H8300.
2002-02-07 Eric Christopher <echristo@redhat.com>
* config/mips/crtn.asm: Cleanup #ifdefs.

11
gcc/config/h8300/h8300.c
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@ -632,12 +632,11 @@ two_insn_adds_subs_operand (op, mode)
}
else
{
/* A constant addition/subtraction takes 2 states in
QImode. It takes 6 states in HImode, requiring the
constant to be loaded to a register first, and a lot more
in SImode. Thus the only case we can win is when either
HImode or SImode is used. */
if (mode != QImode
/* We do not profit directly by splitting addition or
subtraction of 3 and 4. However, since these are
implemented as a sequence of adds or subs, they do not
clobber (cc0) unlike a sequence of add.b and add.x. */
if (mode == HImode
&& (value == 2 + 1
|| value == 2 + 2))
return 1;