b8e1f32cda
The spec can be found in https://github.com/riscv/riscv-zicond. Two instructions are added: - czero.eqz: Moves zero to a register rd, if the condition rs2 is equal to zero, otherwise moves rs1 to rd. - czero.nez: Moves zero to a register rd, if the condition rs2 is nonzero, otherwise moves rs1 to rd. Signed-off-by: Weiwei Li <liweiwei@iscas.ac.cn> Signed-off-by: Junqiang Wang <wangjunqiang@iscas.ac.cn> Reviewed-by: Frank Chang <frank.chang@sifive.com> Message-ID: <20230221091009.36545-1-liweiwei@iscas.ac.cn> Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
50 lines
1.6 KiB
C++
50 lines
1.6 KiB
C++
/*
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* RISC-V translation routines for the Zicond Standard Extension.
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*
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* Copyright (c) 2020-2023 PLCT Lab
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2 or later, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#define REQUIRE_ZICOND(ctx) do { \
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if (!ctx->cfg_ptr->ext_zicond) { \
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return false; \
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} \
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} while (0)
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static bool trans_czero_eqz(DisasContext *ctx, arg_czero_eqz *a)
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{
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REQUIRE_ZICOND(ctx);
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TCGv dest = dest_gpr(ctx, a->rd);
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TCGv src1 = get_gpr(ctx, a->rs1, EXT_NONE);
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TCGv src2 = get_gpr(ctx, a->rs2, EXT_NONE);
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tcg_gen_movcond_tl(TCG_COND_EQ, dest, src2, ctx->zero, ctx->zero, src1);
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gen_set_gpr(ctx, a->rd, dest);
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return true;
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}
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static bool trans_czero_nez(DisasContext *ctx, arg_czero_nez *a)
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{
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REQUIRE_ZICOND(ctx);
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TCGv dest = dest_gpr(ctx, a->rd);
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TCGv src1 = get_gpr(ctx, a->rs1, EXT_NONE);
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TCGv src2 = get_gpr(ctx, a->rs2, EXT_NONE);
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tcg_gen_movcond_tl(TCG_COND_NE, dest, src2, ctx->zero, ctx->zero, src1);
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gen_set_gpr(ctx, a->rd, dest);
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return true;
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}
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