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combine.c (make_compound_operation): Use simplify_subreg.

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2005-06-19  Andreas Krebbel  <krebbel1@de.ibm.com>

	* combine.c (make_compound_operation): Use simplify_subreg.  Delete
	a optimization already done by simplify_subreg.

From-SVN: r101183
This commit is contained in:
Andreas Krebbel 2005-06-19 13:29:45 +00:00 committed by Ulrich Weigand
parent 9f24cc7361
commit 966b148a49
2 changed files with 28 additions and 31 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2005-06-19 Andreas Krebbel <krebbel1@de.ibm.com>
* combine.c (make_compound_operation): Use simplify_subreg. Delete
a optimization already done by simplify_subreg.
2005-06-19 Ulrich Weigand <uweigand@de.ibm.com>
* loop.c (scan_loop): Do not consider insns setting the frame

54
gcc/combine.c
View File

@ -6732,41 +6732,33 @@ make_compound_operation (rtx x, enum rtx_code in_code)
what it originally did, do this SUBREG as a force_to_mode. */
tem = make_compound_operation (SUBREG_REG (x), in_code);
if (GET_CODE (tem) != GET_CODE (SUBREG_REG (x))
&& GET_MODE_SIZE (mode) < GET_MODE_SIZE (GET_MODE (tem))
&& subreg_lowpart_p (x))
{
rtx newer = force_to_mode (tem, mode, ~(HOST_WIDE_INT) 0,
NULL_RTX, 0);
/* If we have something other than a SUBREG, we might have
done an expansion, so rerun ourselves. */
if (GET_CODE (newer) != SUBREG)
newer = make_compound_operation (newer, in_code);
{
rtx simplified;
simplified = simplify_subreg (GET_MODE (x), tem, GET_MODE (tem),
SUBREG_BYTE (x));
return newer;
}
if (simplified)
tem = simplified;
/* If this is a paradoxical subreg, and the new code is a sign or
zero extension, omit the subreg and widen the extension. If it
is a regular subreg, we can still get rid of the subreg by not
widening so much, or in fact removing the extension entirely. */
if ((GET_CODE (tem) == SIGN_EXTEND
|| GET_CODE (tem) == ZERO_EXTEND)
&& subreg_lowpart_p (x))
{
if (GET_MODE_SIZE (mode) > GET_MODE_SIZE (GET_MODE (tem))
|| (GET_MODE_SIZE (mode) >
GET_MODE_SIZE (GET_MODE (XEXP (tem, 0)))))
{
if (! SCALAR_INT_MODE_P (mode))
break;
tem = gen_rtx_fmt_e (GET_CODE (tem), mode, XEXP (tem, 0));
}
else
tem = gen_lowpart (mode, XEXP (tem, 0));
if (GET_CODE (tem) != GET_CODE (SUBREG_REG (x))
&& GET_MODE_SIZE (mode) < GET_MODE_SIZE (GET_MODE (tem))
&& subreg_lowpart_p (x))
{
rtx newer = force_to_mode (tem, mode, ~(HOST_WIDE_INT) 0,
NULL_RTX, 0);
/* If we have something other than a SUBREG, we might have
done an expansion, so rerun ourselves. */
if (GET_CODE (newer) != SUBREG)
newer = make_compound_operation (newer, in_code);
return newer;
}
if (simplified)
return tem;
}
}
break;
default: