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combine.c (can_combine_p): Allow combining insns with REG_RETVAL notes. 

* combine.c (can_combine_p): Allow combining insns with REG_RETVAL
	notes.
	(try_combine): Allow combining insns with REG_LIBCALL notes.

From-SVN: r21833
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Jeffrey A Law 1998-08-18 18:29:40 +00:00 committed by Jeff Law
parent e958d4576a
commit ec35104c79
2 changed files with 16 additions and 1 deletions
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4
gcc/ChangeLog
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@ -5,6 +5,10 @@ Tue Aug 18 12:40:27 1998 Richard Henderson <rth@cygnus.com>
Tue Aug 18 10:33:30 1998 Jeffrey A Law (law@cygnus.com)
* combine.c (can_combine_p): Allow combining insns with REG_RETVAL
notes.
(try_combine): Allow combining insns with REG_LIBCALL notes.
* expr.c (emit_block_move): Do not call memcpy as a libcall
instead build up a CALL_EXPR and call it like any other
function.

13
gcc/combine.c
View File

@ -958,8 +958,14 @@ can_combine_p (insn, i3, pred, succ, pdest, psrc)
/* Don't substitute into an incremented register. */
|| FIND_REG_INC_NOTE (i3, dest)
|| (succ && FIND_REG_INC_NOTE (succ, dest))
#if 0
/* Don't combine the end of a libcall into anything. */
/* ??? This gives worse code, and appears to be unnecessary, since no
pass after flow uses REG_LIBCALL/REG_RETVAL notes. Local-alloc does
use REG_RETVAL notes for noconflict blocks, but other code here
makes sure that those insns don't disappear. */
|| find_reg_note (insn, REG_RETVAL, NULL_RTX)
#endif
/* Make sure that DEST is not used after SUCC but before I3. */
|| (succ && ! all_adjacent
&& reg_used_between_p (dest, succ, i3))
@ -1371,7 +1377,12 @@ try_combine (i3, i2, i1)
if (GET_RTX_CLASS (GET_CODE (i3)) != 'i'
|| GET_RTX_CLASS (GET_CODE (i2)) != 'i'
|| (i1 && GET_RTX_CLASS (GET_CODE (i1)) != 'i')
|| find_reg_note (i3, REG_LIBCALL, NULL_RTX))
#if 0
/* ??? This gives worse code, and appears to be unnecessary, since no
pass after flow uses REG_LIBCALL/REG_RETVAL notes. */
|| find_reg_note (i3, REG_LIBCALL, NULL_RTX)
#endif
)
return 0;
combine_attempts++;