2021-09-23 Kito Cheng <kito.ch...@sifive.com> gcc/ChangeLog:
* config/riscv/riscv.c (riscv_extend_cost): Handle cost model for zbb extension. (riscv_rtx_costs): Ditto. --- gcc/config/riscv/riscv.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/gcc/config/riscv/riscv.c b/gcc/config/riscv/riscv.c index cc58b7041ac..10f7bd21f8d 100644 --- a/gcc/config/riscv/riscv.c +++ b/gcc/config/riscv/riscv.c @@ -1706,6 +1706,16 @@ riscv_extend_cost (rtx op, bool unsigned_p) if (TARGET_ZBA && TARGET_64BIT && unsigned_p && GET_MODE (op) == SImode) return COSTS_N_INSNS (1); + /* ZBB provide zext.h, sext.b and sext.h. */ + if (TARGET_ZBB) + { + if (!unsigned_p && GET_MODE (op) == QImode) + return COSTS_N_INSNS (1); + + if (GET_MODE (op) == HImode) + return COSTS_N_INSNS (1); + } + if (!unsigned_p && GET_MODE (op) == SImode) /* We can use SEXT.W. */ return COSTS_N_INSNS (1); @@ -1796,6 +1806,13 @@ riscv_rtx_costs (rtx x, machine_mode mode, int outer_code, int opno ATTRIBUTE_UN gcc_fallthrough (); case IOR: case XOR: + /* orn, andn and xorn pattern for zbb. */ + if (TARGET_ZBB + && GET_CODE (XEXP (x, 0)) == NOT) + { + *total = riscv_binary_cost (x, 1, 2); + return true; + } /* Double-word operations use two single-word operations. */ *total = riscv_binary_cost (x, 1, 2); return false; -- 2.33.0