https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121334
Bug ID: 121334
Summary: riscv: ICE compiling 523.xalancbmk_r with
-fno-vect-cost-model
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: rdapp at gcc dot gnu.org
Target Milestone: ---
When compiling xalancbmk with -O3 -march=rv64gcv_zvl512b -fno-vect-cost-model
we hit gcc_unreachable () in riscv target code, expanding a const vector
(insn 177 176 178 8 (set (reg:V4QI 292)
(const_vector:V4QI [
(const_poly_int:QI [-2, -8])
(const_poly_int:QI [-1, -8])
(const_poly_int:QI [0, -8])
(const_poly_int:QI [1, -8])
])) "HexBin.cpp":173:27 -1
(nil))
Apparently this has 2 elements per pattern which we don't handle at all...
The following is a reduced example:
struct HexBin {
void init();
char hexNumberTable[];
};
void HexBin::init() {
int i = 57;
for (; i >= 48; i--)
hexNumberTable[i] = i;
}
The issue is also present on the 15 branch.
