https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86621
Bug ID: 86621
Summary: [9 regression] 'alloca' bound is unknown in
tree-vect-slp.c:1437:16
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: bootstrap
Assignee: unassigned at gcc dot gnu.org
Reporter: ro at gcc dot gnu.org
CC: msebor at gcc dot gnu.org
Target Milestone: ---
Host: i386-pc-solaris2.11, sparc-sun-solaris2.11
Target: i386-pc-solaris2.11, sparc-sun-solaris2.11
Build: i386-pc-solaris2.11, sparc-sun-solaris2.11
Between 20180720 (r262899) and 20180721 (r262917), Solaris bootstrap broke like
this:
In file included from /vol/gcc/src/hg/trunk/local/gcc/system.h:691,
from /vol/gcc/src/hg/trunk/local/gcc/tree-vect-slp.c:23:
/vol/gcc/src/hg/trunk/local/gcc/tree-vect-slp.c: In function '_slp_tree*
vect_build_slp_tree_2(vec_info*, vec<gimple*>, unsigned int, poly_uint64*,
vec<_slp_tree*>*, bool*, unsigned int*, unsigned int*, unsigned int)':
/vol/gcc/src/hg/trunk/local/gcc/../include/libiberty.h:722:36: error: 'alloca'
bound is unknown [-Werror=alloca-larger-than=]
# define alloca(x) __builtin_alloca(x)
~~~~~~~~~~~~~~~~^~~
/vol/gcc/src/hg/trunk/local/gcc/../include/libiberty.h:356:33: note: in
expansion of macro 'alloca'
#define XALLOCAVEC(T, N) ((T *) alloca (sizeof (T) * (N)))
^~~~~~
/vol/gcc/src/hg/trunk/local/gcc/tree-vect-slp.c:1437:16: note: in expansion of
macro 'XALLOCAVEC'
bool *tem = XALLOCAVEC (bool, group_size);
^~~~~~~~~~
This is almost certainly due to
2018-07-20 Martin Sebor <mse...@redhat.com>
PR middle-end/82063
* builtins.c (expand_builtin_alloca): Adjust.
* calls.c (alloc_max_size): Simplify.
* cgraphunit.c (cgraph_node::expand): Adjust.
* common.opt (larger_than_size, warn_frame_larger_than): Remove
variables.
(frame_larger_than_size): Same.
(-Wframe-larger-than, -Wlarger-than, -Wstack-usage): Change options
to take a HOST_WIDE_INT argument and accept a byte-size suffix.
Initialize.
* doc/invoke.texi (GCC Command Options): Document option arguments.
Explain byte-size arguments and suffixes.
(-Wvla-larger-than, -Wno-alloc-size-larger-than): Update.
(-Wno-alloca-larger-than, -Wno-vla-larger-than): Same.
(-Wframe-larger-than, -Wlarger-than, -Wstack-usage): Same.
* doc/options.texi (UInteger): Expand.
(Host_Wide_Int, ByteSize): Document new properties.
* final.c (final_start_function_1): Include sizes in an error message.
* function.c (frame_offset_overflow): Same.
* gimple-ssa-warn-alloca.c (pass_walloca::gate): Adjust.
(alloca_call_type_by_arg): Change function argument to HOST_WIDE_INT.
Diagnose unbounded alloca calls only for limits of less than
PTRDIFF_MAX.
(alloca_call_type): Adjust. Diagnose possibly out-of-bounds alloca
calls and VLA size only for limits of less than PTRDIFF_MAX. Same
for alloca(0).
(pass_walloca::execute): Adjust. Diagnose alloca calls in loops
only for limits of less than PTRDIFF_MAX.
* langhooks-def.h (lhd_handle_option): Change function argument
to HOST_WIDE_INT.
* langhooks.c (lhd_handle_option): Same.
* langhooks.h (handle_option): Same.
* opt-functions.awk (switch_bit_fields): Handle Host_Wide_Int and
ByteSize flags.
(var_type, var_type_struct): Same.
(var_set): Handle ByteSize flag.
* optc-gen.awk: Add comments to output to ease debugging. Make
use of HOST_WIDE_INT where appropriate.
* opts-gen-save.awk: Use %lx to format unsigned long.
* opth-gen.awk: Change function argument to HOST_WIDE_INT.
* opts-common.c (integral_argument): Return HOST_WIDE_INT and add
arguments. Parse bytes-size suffixes.
(enum_arg_to_value): Change function argument to HOST_WIDE_INT.
(enum_value_to_arg): Same.
(decode_cmdline_option): Handle cl_host_wide_int. Adjust.
(handle_option): Adjust.
(generate_option): Change function argument to HOST_WIDE_INT.
(cmdline_handle_error): Adjust.
(read_cmdline_option): Change function argument to HOST_WIDE_INT.
(set_option): Change function argument to HOST_WIDE_INT.
(option_enabled): Handle cl_host_wide_int.
(get_option_state): Handle CLVC_SIZE.
(control_warning_option): Same.
* opts.c (common_handle_option): Change function argument to
HOST_WIDE_INT. Remove handling of OPT_Walloca_larger_than_ and
OPT_Wvla_larger_than_.
* opts.h (enum cl_var_type): Add an enumerator.
* stor-layout.c (layout_decl): Print a more meaningful warning.
* toplev.c (output_stack_usage): Adjust.
