This change fixes PR middle-end/53823. The negative variant of
synth_mult doesn't handle modes larger than a host wide int.
Approved by rth in PR.
Tested on hppa2.0w-hp-hpux11.11 and hppa64-hp-hpux11.11.
Dave
--
J. David Anglin dave.ang...@nrc-cnrc.gc.ca
National Research Council of Canada (613) 990-0752 (FAX: 952-6602)
2012-08-18 John David Anglin <dave.ang...@nrc-cnrc.gc.ca>
PR middle-end/53823
* expmed.c (expand_mult): Skip synth_mult for negative coefficients
if the mode is larger than a wide int and it is too costly to multiply
by a positive multiplier and negate the result.
Index: expmed.c
===================================================================
--- expmed.c (revision 190317)
+++ expmed.c (working copy)
@@ -3261,7 +3261,6 @@
/* Attempt to handle multiplication of DImode values by negative
coefficients, by performing the multiplication by a positive
multiplier and then inverting the result. */
- /* ??? How is this not slightly redundant with the neg variant? */
if (is_neg && mode_bitsize > HOST_BITS_PER_WIDE_INT)
{
/* Its safe to use -coeff even for INT_MIN, as the
@@ -3278,6 +3277,7 @@
&algorithm, variant);
return expand_unop (mode, neg_optab, temp, target, 0);
}
+ goto skip_synth;
}
/* Exclude cost of op0 from max_cost to match the cost
