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* [Bug middle-end/56934] New: ICE folding a COND_EXPR involving vectors
@ 2013-04-12 13:50 glisse at gcc dot gnu.org
2013-04-16 5:09 ` [Bug middle-end/56934] " mpolacek at gcc dot gnu.org
2013-05-23 22:43 ` glisse at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: glisse at gcc dot gnu.org @ 2013-04-12 13:50 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56934
Bug #: 56934
Summary: ICE folding a COND_EXPR involving vectors
Classification: Unclassified
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: glisse@gcc.gnu.org
typedef long veci __attribute__((vector_size(16)));
veci f(double a, veci b){
return (a<2)?(b<3):(b!=b);
}
e.cc: In function 'veci f(double, veci)':
e.cc:3:27: internal compiler error: in fold_convert_loc, at fold-const.c:1972
return (a<2)?(b<3):(b!=b);
^
I think the folding should just be disabled in this case. Even if fold_convert
was taught how to convert scalars to vectors, it would produce a vector {1,1}
instead of {-1,-1} (and it would build a TRUTH_ANDIF_EXPR with vectors). I have
a fix as part of another patch.
An alternative fix would be to make truth_value_p return false for vectors,
which would make us regress on several optimizations I guess.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug middle-end/56934] ICE folding a COND_EXPR involving vectors
2013-04-12 13:50 [Bug middle-end/56934] New: ICE folding a COND_EXPR involving vectors glisse at gcc dot gnu.org
@ 2013-04-16 5:09 ` mpolacek at gcc dot gnu.org
2013-05-23 22:43 ` glisse at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2013-04-16 5:09 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56934
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2013-04-16
CC| |mpolacek at gcc dot gnu.org
Ever Confirmed|0 |1
Known to fail| |4.8.0, 4.9.0
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> 2013-04-16 05:09:52 UTC ---
Confirmed with trunk/4.8.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug middle-end/56934] ICE folding a COND_EXPR involving vectors
2013-04-12 13:50 [Bug middle-end/56934] New: ICE folding a COND_EXPR involving vectors glisse at gcc dot gnu.org
2013-04-16 5:09 ` [Bug middle-end/56934] " mpolacek at gcc dot gnu.org
@ 2013-05-23 22:43 ` glisse at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: glisse at gcc dot gnu.org @ 2013-05-23 22:43 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56934
Marc Glisse <glisse at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |4.9.0
Known to fail|4.9.0 |
--- Comment #2 from Marc Glisse <glisse at gcc dot gnu.org> ---
Fixed on trunk.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2013-04-12 13:50 [Bug middle-end/56934] New: ICE folding a COND_EXPR involving vectors glisse at gcc dot gnu.org
2013-04-16 5:09 ` [Bug middle-end/56934] " mpolacek at gcc dot gnu.org
2013-05-23 22:43 ` glisse at gcc dot gnu.org
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