https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106900
Bug ID: 106900
Summary: Regression after memchr optimization
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: jbg...@lug-owl.de
Target Milestone: ---
Hi!
The optimization prepared in PR103798 ("memchr with a (small) constant string
should be expanded inline", c6cf555a88f8ffb8ec85c2b94fe656ab217260ea) caused a
regression for avr-elf, pru-elf and rl78-elf:
.../gcc/configure --prefix=... --enable-werror-always --enable-languages=all
--disable-gcov --disable-shared --disable-threads --target=pru-elf
--without-headers
[...]
make V=1 all-gcc
[...]
/usr/lib/gcc-snapshot/bin/g++ -fno-PIE -c -g -O2 -DIN_GCC
-DCROSS_DIRECTORY_STRUCTURE -fno-exceptions -fno-rtti
-fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings -W
cast-qual -Wmissing-format-attribute -Woverloaded-virtual -pedantic
-Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Werror -fno-common
-DHAVE_CONFIG_H -I. -I. -I../../gcc/gcc -I../../gcc/gcc/.
-I../../gcc/gcc/../include -I../../gcc/gcc/../libcpp/include
-I../../gcc/gcc/../libcody -I../../gcc/gcc/../libdecnumber
-I../../gcc/gcc/../libdecnumber/dpd -I../libdecnumber
-I../../gcc/gcc/../libbacktrace -o tree-ssa-forwprop.o -MT
tree-ssa-forwprop.o -MMD -MP -MF ./.deps/tree-ssa-forwprop.TPo
../../gcc/gcc/tree-ssa-forwprop.cc
../../gcc/gcc/tree-ssa-forwprop.cc: In function 'bool
simplify_builtin_call(gimple_stmt_iterator*, tree)':
../../gcc/gcc/tree-ssa-forwprop.cc:1258:42: error: array subscript 1 is outside
array bounds of 'tree_node* [1]' [-Werror=array-bounds]
1258 | op[i - 1] = fold_convert_loc (loc, boolean_type_node,
| ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
1259 | fold_build2_loc (loc,
| ~~~~~~~~~~~~~~~~~~~~~
1260 |
BIT_IOR_EXPR,
|
~~~~~~~~~~~~~
1261 |
boolean_type_node,
|
~~~~~~~~~~~~~~~~~~
1262 | op[i - 1],
| ~~~~~~~~~~
1263 | op[i]));
| ~~~~~~~
In file included from ../../gcc/gcc/system.h:707,
from ../../gcc/gcc/tree-ssa-forwprop.cc:21:
../../gcc/gcc/../include/libiberty.h:733:36: note: at offset 8 into object of
size [0, 8] allocated by '__builtin_alloca'
733 | # define alloca(x) __builtin_alloca(x)
| ~~~~~~~~~~~~~~~~^~~
../../gcc/gcc/../include/libiberty.h:365:40: note: in expansion of macro
'alloca'
365 | #define XALLOCAVEC(T, N) ((T *) alloca (sizeof (T) * (N)))
| ^~~~~~
../../gcc/gcc/tree-ssa-forwprop.cc:1250:22: note: in expansion of macro
'XALLOCAVEC'
1250 | tree *op = XALLOCAVEC (tree, isize);
| ^~~~~~~~~~
cc1plus: all warnings being treated as errors
make[1]: *** [Makefile:1146: tree-ssa-forwprop.o] Error 1
(Last confirmed at c2c3e4f6698925c8c969d8525677fbfe98f78909.)
