https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114352
--- Comment #3 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Pan Li <pa...@gcc.gnu.org>: https://gcc.gnu.org/g:d3c24e9e55a7cf18df313a8b32b6de4b3ba81013 commit r14-9604-gd3c24e9e55a7cf18df313a8b32b6de4b3ba81013 Author: Pan Li <pan2...@intel.com> Date: Mon Mar 18 11:21:29 2024 +0800 RISC-V: Bugfix ICE for __attribute__((target("arch=+v")) This patch would like to fix one ICE for __attribute__((target("arch=+v")) and likewise extension(s). Given we have sample code as below: void __attribute__((target("arch=+v"))) test_2 (int *a, int *b, int *out, unsigned count) { unsigned i; for (i = 0; i < count; i++) out[i] = a[i] + b[i]; } It will have ICE when build with -march=rv64gc -O3. test.c: In function âtest_2â: test.c:4:1: internal compiler error: Floating point exception 4 | { | ^ 0x1a5891b crash_signal .../__RISC-V_BUILD__/../gcc/toplev.cc:319 0x7f0a7884251f ??? ./signal/../sysdeps/unix/sysv/linux/x86_64/libc_sigaction.c:0 0x1f51ba4 riscv_hard_regno_nregs .../__RISC-V_BUILD__/../gcc/config/riscv/riscv.cc:8143 0x1967bb9 init_reg_modes_target() .../__RISC-V_BUILD__/../gcc/reginfo.cc:471 0x13fc029 init_emit_regs() .../__RISC-V_BUILD__/../gcc/emit-rtl.cc:6237 0x1a5b83d target_reinit() .../__RISC-V_BUILD__/../gcc/toplev.cc:1936 0x35e374d save_target_globals() .../__RISC-V_BUILD__/../gcc/target-globals.cc:92 0x35e381f save_target_globals_default_opts() .../__RISC-V_BUILD__/../gcc/target-globals.cc:122 0x1f544cc riscv_save_restore_target_globals(tree_node*) .../__RISC-V_BUILD__/../gcc/config/riscv/riscv.cc:9138 0x1f55c36 riscv_set_current_function ... There are two reasons for this ICE. 1. The implied extension(s) of v are not well handled and the TARGET_MIN_VLEN is 0 which is not reinitialized. Then the size / TARGET_MIN_VLEN will have DivideByZero. 2. The machine modes of the vector types will be vary after the v extension is introduced. This patch passed below testsuite: 1. The riscv fully regression test. PR target/114352 gcc/ChangeLog: * common/config/riscv/riscv-common.cc (riscv_subset_list::parse): Replace implied, combine and check to func finalize. (riscv_subset_list::finalize): New func impl to take care of implied, combine ext and related checks. * config/riscv/riscv-subset.h: Add func decl for finalize. * config/riscv/riscv-target-attr.cc (riscv_target_attr_parser::parse_arch): Finalize the ext before return succeed. * config/riscv/riscv.cc (riscv_set_current_function): Reinit the machine mode before when set cur function. gcc/testsuite/ChangeLog: * gcc.target/riscv/rvv/base/pr114352-1.c: New test. * gcc.target/riscv/rvv/base/pr114352-2.c: New test. Signed-off-by: Pan Li <pan2...@intel.com>