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Add missing comments pointed out by Andreas Schwab. 

* regmove.c (fixup_match_2, find_matches, regmove_profitable):
	Add explanatory comments.

From-SVN: r19677
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Jim Wilson 1998-05-11 18:11:22 +00:00 committed by Jim Wilson
parent 50324922d7
commit b1a7d59104
2 changed files with 28 additions and 1 deletions
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3
gcc/ChangeLog
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@ -1,5 +1,8 @@
Mon May 11 17:43:03 1998 Jim Wilson <wilson@cygnus.com>
* regmove.c (fixup_match_2, find_matches, regmove_profitable):
Add explanatory comments.
* sparc.h (SPARC_INCOMING_INT_ARG_FIRST): Support TARGET_FLAT.
Mon May 11 17:24:27 1998 Richard Henderson <rth@cygnus.com>

26
gcc/regmove.c
View File

@ -570,8 +570,24 @@ reg_is_remote_constant_p (reg, insn, first)
return 0;
}
/* INSN is adding a CONST_INT to a REG. We search backwards looking for
another add immediate instruction with the same source and dest registers,
and if we find one, we change INSN to an increment, and return 1. If
no changes are made, we return 0.
This changes
(set (reg100) (plus reg1 offset1))
...
(set (reg100) (plus reg1 offset2))
to
(set (reg100) (plus reg1 offset1))
...
(set (reg100) (plus reg100 offset2-offset1)) */
/* ??? What does this comment mean? */
/* cse disrupts preincrement / postdecrement squences when it finds a
hard register as ultimate source, like the frame pointer. */
int
fixup_match_2 (insn, dst, src, offset, regmove_dump_file)
rtx insn, dst, src, offset;
@ -1143,6 +1159,11 @@ regmove_optimize (f, nregs, regmove_dump_file)
#endif /* REGISTER_CONSTRAINTS */
}
/* Returns the INSN_CODE for INSN if its pattern has matching constraints for
any operand. Returns -1 if INSN can't be recognized, or if the alternative
can't be determined.
Initialize the info in MATCHP based on the constraints. */
static int
find_matches (insn, matchp)
@ -1711,7 +1732,10 @@ stable_but_for_p (x, src, dst)
}
}
/* Test if regmove seems profitable for this target. */
/* Test if regmove seems profitable for this target. Regmove is useful only
if some common patterns are two address, i.e. require matching constraints,
so we check that condition here. */
int
regmove_profitable_p ()
{