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re PR middle-end/53823 (FAIL: gcc.c-torture/execute/930921-1.c execution at -O0 and -O1)

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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.

From-SVN: r190505
This commit is contained in:
John David Anglin 2012-08-18 23:16:53 +00:00 committed by John David Anglin
parent b44e2c4cfb
commit b216b86b7e
2 changed files with 8 additions and 1 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2012-08-18 John David Anglin <dave.anglin@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.
2012-08-18 Steven Bosscher <steven@gcc.gnu.org>
* sparseset.c (sparseset_alloc): Use non-clearing allocation. Tell

2
gcc/expmed.c
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@ -3261,7 +3261,6 @@ expand_mult (enum machine_mode mode, rtx op0, rtx op1, rtx target,
/* 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 @@ expand_mult (enum machine_mode mode, rtx op0, rtx op1, rtx target,
&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