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| author | danglin <danglin@138bc75d-0d04-0410-961f-82ee72b054a4> | 2012-08-18 23:16:53 +0000 |
|---|---|---|
| committer | danglin <danglin@138bc75d-0d04-0410-961f-82ee72b054a4> | 2012-08-18 23:16:53 +0000 |
| commit | 4105320e4afed077194515f0c442bb0855137a6f (patch) | |
| tree | cce054ce1aba013927a269a47a19b00fcd6964a0 /gcc/expmed.c | |
| parent | 91e240377eebcb2a08cde93d927ba8d743b48745 (diff) | |
| download | gcc-4105320e4afed077194515f0c442bb0855137a6f.tar.gz | |
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.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@190505 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/expmed.c')
| -rw-r--r-- | gcc/expmed.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/gcc/expmed.c b/gcc/expmed.c index ac944f159bd..6c94a90fb84 100644 --- a/gcc/expmed.c +++ b/gcc/expmed.c @@ -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 |