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* [Bug c++/63241] New: Internal error in gimplify_init_constructor when using constexr and multidimensional arrays
@ 2014-09-12 12:36 thibaut.lutz at googlemail dot com
2014-09-17 14:12 ` [Bug c++/63241] " paolo.carlini at oracle dot com
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: thibaut.lutz at googlemail dot com @ 2014-09-12 12:36 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63241
Bug ID: 63241
Summary: Internal error in gimplify_init_constructor when using
constexr and multidimensional arrays
Product: gcc
Version: 4.9.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: thibaut.lutz at googlemail dot com
I stumbled upon a weird regression bug. The test case below is working fine
with GCC 4.8 and 4.9.0 but triggers an internal error on 4.9.1. I haven't
tested 4.9.2.
Any of these modifications would remove the error:
- removing `constexpr` from the constructor at line 2
- using `0` instead of `i` in the second array element constructor at line 8
- using `const int i` instead of `int i` at line 6
- using a 1D array instead of a 2D array at line 7
So I believe the example below cannot be reduced further.
However somehow the combination of `constexpr` constructor and multidimensional
array is causing the compiler to crash.
Details:
* GCC version: 4.9.1 built with default config
* System: x86_64 GNU/Linux
* Command line: c++ -std=c++11 bug.cpp
* Minimal example:
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
struct A {
constexpr A(int){}
};
int main() {
int i = 1;
A array[2][2] =
{{{0}, {i}},
{{0}, {0}}};
}
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
* Output:
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
bug.cpp: In function ‘int main()’:
bug.cpp:9:16: internal compiler error: in gimplify_init_constructor, at
gimplify.c:4007
{{0}, {0}}};
^
0x7f6213 gimplify_init_constructor
../.././gcc/gimplify.c:4007
0x7f6dee gimplify_modify_expr_rhs
../.././gcc/gimplify.c:4167
0x7f6ec4 gimplify_modify_expr
../.././gcc/gimplify.c:4486
0x7f7dda gimplify_expr(tree_node**, gimple_statement_base**,
gimple_statement_base**, bool (*)(tree_node*), int)
../.././gcc/gimplify.c:7627
0x7facd6 gimplify_stmt(tree_node**, gimple_statement_base**)
../.././gcc/gimplify.c:5373
0x7f806a gimplify_cleanup_point_expr
../.././gcc/gimplify.c:5149
0x7f806a gimplify_expr(tree_node**, gimple_statement_base**,
gimple_statement_base**, bool (*)(tree_node*), int)
../.././gcc/gimplify.c:7990
0x7facd6 gimplify_stmt(tree_node**, gimple_statement_base**)
../.././gcc/gimplify.c:5373
0x7f8d3b gimplify_statement_list
../.././gcc/gimplify.c:1432
0x7f8d3b gimplify_expr(tree_node**, gimple_statement_base**,
gimple_statement_base**, bool (*)(tree_node*), int)
../.././gcc/gimplify.c:8042
0x7facd6 gimplify_stmt(tree_node**, gimple_statement_base**)
../.././gcc/gimplify.c:5373
0x7f806a gimplify_cleanup_point_expr
../.././gcc/gimplify.c:5149
0x7f806a gimplify_expr(tree_node**, gimple_statement_base**,
gimple_statement_base**, bool (*)(tree_node*), int)
../.././gcc/gimplify.c:7990
0x7facd6 gimplify_stmt(tree_node**, gimple_statement_base**)
../.././gcc/gimplify.c:5373
0x7f8d3b gimplify_statement_list
../.././gcc/gimplify.c:1432
0x7f8d3b gimplify_expr(tree_node**, gimple_statement_base**,
gimple_statement_base**, bool (*)(tree_node*), int)
../.././gcc/gimplify.c:8042
0x7facd6 gimplify_stmt(tree_node**, gimple_statement_base**)
../.././gcc/gimplify.c:5373
0x7fb56b gimplify_bind_expr
../.././gcc/gimplify.c:1099
0x7f7fc0 gimplify_expr(tree_node**, gimple_statement_base**,
gimple_statement_base**, bool (*)(tree_node*), int)
../.././gcc/gimplify.c:7824
0x7facd6 gimplify_stmt(tree_node**, gimple_statement_base**)
../.././gcc/gimplify.c:5373
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
>From gcc-bugs-return-461669-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Sep 12 12:45:26 2014
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From: "ebotcazou at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/62631] gcc.dg/tree-ssa/ivopts-lt-2.c FAILs
Date: Fri, 12 Sep 2014 12:45:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62631
Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Component|tree-optimization |target
Assignee|unassigned at gcc dot gnu.org |ebotcazou at gcc dot gnu.org
--- Comment #10 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> * For the mult part, rtx_code calls sparc_rtx_cost, which has
>
> case MULT:
> if (float_mode_p)
> *total = sparc_costs->float_mul;
> else if (! TARGET_HARD_MUL)
> *total = COSTS_N_INSNS (25);
>
> On SPARCv9/-m64, TARGET_HARD_MUL is false, so we get the 25*4 = 100 part,
> unlike v8, which explains why the test only fails for 64-bit.
Ugh, thanks for spotting it, this looks like an annoying oversight.
>From gcc-bugs-return-461670-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Sep 12 12:56:44 2014
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From: "wbrana at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/63242] New: memory starvation caused by flatten attribute
Date: Fri, 12 Sep 2014 12:56:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idc242
Bug ID: 63242
Summary: memory starvation caused by flatten attribute
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
Assignee: unassigned at gcc dot gnu.org
Reporter: wbrana at gmail dot com
forwarded from https://bugs.freedesktop.org/show_bug.cgi?idw580
Hello,
I've been testing GCC 4.9 for a virtual gentoo machine and I noticed that
you us flatten attribute in source code. In case of src/sna/sna_glyphs.c
flatten functions, inliner inlines about 3.3M functions and crashes because of
no free memory (I have 8GB memory).
Please notice that LTO has ability to optimize whole program. As a result, it
sees almost all function bodies and that leads to enormous inlining.
Suggested patch removes these flatten attributes for selected functions.
Thank you,
MArtin
^ permalink raw reply [flat|nested] 5+ messages in thread
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-- links below jump to the message on this page --
2014-09-12 12:36 [Bug c++/63241] New: Internal error in gimplify_init_constructor when using constexr and multidimensional arrays thibaut.lutz at googlemail dot com
2014-09-17 14:12 ` [Bug c++/63241] " paolo.carlini at oracle dot com
2014-09-17 14:30 ` paolo at gcc dot gnu.org
2014-09-17 14:31 ` paolo.carlini at oracle dot com
2014-09-17 14:31 ` paolo at gcc dot gnu.org
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