22622a5a31
I realize there is a RTL regression between GCC-14 and GCC-13. https://godbolt.org/z/Ga7K6MqaT GCC-14: (insn 9 13 31 2 (set (reg:DI 15 a5 [138]) (unspec:DI [ (const_int 64 [0x40]) ] UNSPEC_VLMAX)) "/app/example.c":5:15 2566 {vlmax_avldi} (expr_list:REG_EQUIV (unspec:DI [ (const_int 64 [0x40]) ] UNSPEC_VLMAX) (nil))) (insn 31 9 10 2 (parallel [ (set (reg:DI 15 a5 [138]) (unspec:DI [ (reg:DI 0 zero) (const_int 32 [0x20]) (const_int 7 [0x7]) (const_int 1 [0x1]) repeated x2 ] UNSPEC_VSETVL)) (set (reg:SI 66 vl) (unspec:SI [ (reg:DI 0 zero) (const_int 32 [0x20]) (const_int 7 [0x7]) ] UNSPEC_VSETVL)) (set (reg:SI 67 vtype) (unspec:SI [ (const_int 32 [0x20]) (const_int 7 [0x7]) (const_int 1 [0x1]) repeated x2 ] UNSPEC_VSETVL)) ]) "/app/example.c":5:15 3281 {vsetvldi} (nil)) GCC-13: (insn 10 7 26 2 (set (reg/f:DI 11 a1 [139]) (plus:DI (reg:DI 11 a1 [142]) (const_int 800 [0x320]))) "/app/example.c":6:32 5 {adddi3} (nil)) (insn 26 10 9 2 (parallel [ (set (reg:DI 15 a5) (unspec:DI [ (reg:DI 0 zero) (const_int 32 [0x20]) (const_int 7 [0x7]) (const_int 1 [0x1]) repeated x2 ] UNSPEC_VSETVL)) (set (reg:SI 66 vl) (unspec:SI [ (reg:DI 0 zero) (const_int 32 [0x20]) (const_int 7 [0x7]) ] UNSPEC_VSETVL)) (set (reg:SI 67 vtype) (unspec:SI [ (const_int 32 [0x20]) (const_int 7 [0x7]) (const_int 1 [0x1]) repeated x2 ] UNSPEC_VSETVL)) ]) "/app/example.c":5:15 792 {vsetvldi} (nil)) GCC-13 doesn't have: (insn 9 13 31 2 (set (reg:DI 15 a5 [138]) (unspec:DI [ (const_int 64 [0x40]) ] UNSPEC_VLMAX)) "/app/example.c":5:15 2566 {vlmax_avldi} (expr_list:REG_EQUIV (unspec:DI [ (const_int 64 [0x40]) ] UNSPEC_VLMAX) (nil))) vsetvl_pre doesn't emit any assembler which is just used for occupying scalar register. It should be removed in VSETVL PASS. Tested on both RV32 and RV64 no regression. gcc/ChangeLog: * config/riscv/riscv-vsetvl.cc (vsetvl_pre_insn_p): New function. (pre_vsetvl::cleaup): Remove vsetvl_pre. (pre_vsetvl::remove_vsetvl_pre_insns): New function. gcc/testsuite/ChangeLog: * gcc.target/riscv/rvv/vsetvl/vsetvl_pre-1.c: New test. |
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