Hi!
On Wed, 2022-07-13 09:50:14 -0700, H.J. Lu via Gcc-patches
<gcc-patches@gcc.gnu.org> wrote:
> When memchr is applied on a constant string of no more than the bytes of
> a word, simplify memchr by checking each byte in the constant string.
>
> int f (int a)
> {
> return __builtin_memchr ("AE", a, 2) != 0;
> }
>
> is simplified to
>
> int f (int a)
> {
> return ((char) a == 'A' || (char) a == 'E') != 0;
> }
Seems this caused a regression for --target=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
-Wcast-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
make[1]: Leaving directory
'/var/lib/laminar/run/gcc-pru-elf/1/toolchain-build/gcc'
make: *** [Makefile:4583: all-gcc] Error 2
Thanks,
Jan-Benedict
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