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rtlanal.c (noop_move_p): Insns with a REG_RETVAL note should not be considered as a no-op.

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* rtlanal.c (noop_move_p): Insns with a REG_RETVAL note
	should not be considered as a no-op.
	* flow.c (delete_noop_moves): Handle REG_LIBCALL notes.

From-SVN: r46174
This commit is contained in:
John Wehle 2001-10-11 03:51:24 +00:00 committed by John Wehle
parent b36948478c
commit eb9d8e4d0b
3 changed files with 30 additions and 2 deletions
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6
gcc/ChangeLog
View File

@ -1,3 +1,9 @@
Wed Oct 10 23:49:06 EDT 2001 John Wehle (john@feith.com)
* rtlanal.c (noop_move_p): Insns with a REG_RETVAL note
should not be considered as a no-op.
* flow.c (delete_noop_moves): Handle REG_LIBCALL notes.
2001-10-10 Stan Shebs <shebs@apple.com>
* alias.c: Remove uses of "register" specifier in declarations

21
gcc/flow.c
View File

@ -771,8 +771,25 @@ delete_noop_moves (f)
next = NEXT_INSN (insn);
if (INSN_P (insn) && noop_move_p (insn))
{
/* Do not call delete_insn here to not confuse backward
pointers of LIBCALL block. */
rtx note;
/* If we're about to remove the first insn of a libcall
then move the libcall note to the next real insn and
update the retval note. */
if ((note = find_reg_note (insn, REG_LIBCALL, NULL_RTX))
&& XEXP (note, 0) != insn)
{
rtx new_libcall_insn = next_real_insn (insn);
rtx retval_note = find_reg_note (XEXP (note, 0),
REG_RETVAL, NULL_RTX);
REG_NOTES (new_libcall_insn)
= gen_rtx_INSN_LIST (REG_LIBCALL, XEXP (note, 0),
REG_NOTES (new_libcall_insn));
XEXP (retval_note, 0) = new_libcall_insn;
}
/* Do not call delete_insn here since that may change
the basic block boundaries which upsets some callers. */
PUT_CODE (insn, NOTE);
NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED;
NOTE_SOURCE_FILE (insn) = 0;

5
gcc/rtlanal.c
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@ -1037,6 +1037,11 @@ noop_move_p (insn)
if (find_reg_note (insn, REG_EQUAL, NULL_RTX))
return 0;
/* For now treat an insn with a REG_RETVAL note as a
a special insn which should not be considered a no-op. */
if (find_reg_note (insn, REG_RETVAL, NULL_RTX))
return 0;
if (GET_CODE (pat) == SET && set_noop_p (pat))
return 1;