https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118377
Bug ID: 118377
Summary: [15 Regression] ICE when using C division operator
with svint8 and svint16
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: soumyaa at gcc dot gnu.org
Target Milestone: ---
When using the C division operator with svint8 and svint16 SVE ACLE vectors,
the following ICE occurs:
during GIMPLE pass: veclower
test.c: In function ‘foo’:
test.c:4:1: internal compiler error: in to_constant, at poly-int.h:592
4 | foo (svint16_t x)
| ^~~
0x2366fab internal_error(char const*, ...)
../../gcc_src/gcc/diagnostic-global-context.cc:517
0x81b1b3 fancy_abort(char const*, int, char const*)
../../gcc_src/gcc/diagnostic.cc:1722
0x80902f poly_int<2u, unsigned long>::to_constant() const
../../gcc_src/gcc/poly-int.h:592
0x130096b poly_int<2u, unsigned long>::to_constant() const
../../gcc_src/gcc/poly-int.h:590
0x130096b nunits_for_known_piecewise_op
../../gcc_src/gcc/tree-vect-generic.cc:92
0x130096b expand_vector_piecewise
../../gcc_src/gcc/tree-vect-generic.cc:294
0x130152b expand_vector_operation
../../gcc_src/gcc/tree-vect-generic.cc:1159
0x130400b expand_vector_operations_1
../../gcc_src/gcc/tree-vect-generic.cc:2243
0x1305e33 expand_vector_operations
../../gcc_src/gcc/tree-vect-generic.cc:2274
0x1305e33 execute
../../gcc_src/gcc/tree-vect-generic.cc:2326
Testcase (compiled with -mcpu=neoverse-v2):
#include <arm_sve.h>
svint16_t
foo (svint16_t x)
{
return x / 4;
}
This most likely happens because SVE integer division using SDIV/UDIV is only
supported for 32-bit and 64-bit modes, and the middle-end does not have a
proper fallback if any other types are forced.
