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target/riscv: rvb: count leading/trailing zeros

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Signed-off-by: Kito Cheng <kito.cheng@sifive.com>
Signed-off-by: Frank Chang <frank.chang@sifive.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20210505160620.15723-3-frank.chang@sifive.com
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Kito Cheng 2021-05-06 00:06:03 +08:00 committed by Alistair Francis
parent 00718208c1
commit 438240185a
4 changed files with 93 additions and 1 deletions
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1
target/riscv/cpu.h
View file

@ -67,6 +67,7 @@
#define RVS RV('S')
#define RVU RV('U')
#define RVH RV('H')
#define RVB RV('B')
/* S extension denotes that Supervisor mode exists, however it is possible
to have a core that support S mode but does not have an MMU and there

11
target/riscv/insn32.decode
View file

@ -41,6 +41,7 @@
&i imm rs1 rd
&j imm rd
&r rd rs1 rs2
&r2 rd rs1
&s imm rs1 rs2
&u imm rd
&shift shamt rs1 rd
@ -68,7 +69,7 @@
@r4_rm ..... .. ..... ..... ... ..... ....... %rs3 %rs2 %rs1 %rm %rd
@r_rm ....... ..... ..... ... ..... ....... %rs2 %rs1 %rm %rd
@r2_rm ....... ..... ..... ... ..... ....... %rs1 %rm %rd
@r2 ....... ..... ..... ... ..... ....... %rs1 %rd
@r2 ....... ..... ..... ... ..... ....... &r2 %rs1 %rd
@r2_nfvm ... ... vm:1 ..... ..... ... ..... ....... &r2nfvm %nf %rs1 %rd
@r2_vm ...... vm:1 ..... ..... ... ..... ....... &rmr %rs2 %rd
@r1_vm ...... vm:1 ..... ..... ... ..... ....... %rd
@ -657,3 +658,11 @@ vamomind_v 10000 . . ..... ..... 111 ..... 0101111 @r_wdvm
vamomaxd_v 10100 . . ..... ..... 111 ..... 0101111 @r_wdvm
vamominud_v 11000 . . ..... ..... 111 ..... 0101111 @r_wdvm
vamomaxud_v 11100 . . ..... ..... 111 ..... 0101111 @r_wdvm
# *** RV32B Standard Extension ***
clz 011000 000000 ..... 001 ..... 0010011 @r2
ctz 011000 000001 ..... 001 ..... 0010011 @r2
# *** RV64B Standard Extension (in addition to RV32B) ***
clzw 0110000 00000 ..... 001 ..... 0011011 @r2
ctzw 0110000 00001 ..... 001 ..... 0011011 @r2

44
target/riscv/insn_trans/trans_rvb.c.inc Normal file
View file

@ -0,0 +1,44 @@
/*
* RISC-V translation routines for the RVB Standard Extension.
*
* Copyright (c) 2020 Kito Cheng, kito.cheng@sifive.com
* Copyright (c) 2020 Frank Chang, frank.chang@sifive.com
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2 or later, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
static bool trans_clz(DisasContext *ctx, arg_clz *a)
{
REQUIRE_EXT(ctx, RVB);
return gen_unary(ctx, a, gen_clz);
}
static bool trans_ctz(DisasContext *ctx, arg_ctz *a)
{
REQUIRE_EXT(ctx, RVB);
return gen_unary(ctx, a, gen_ctz);
}
static bool trans_clzw(DisasContext *ctx, arg_clzw *a)
{
REQUIRE_64BIT(ctx);
REQUIRE_EXT(ctx, RVB);
return gen_unary(ctx, a, gen_clzw);
}
static bool trans_ctzw(DisasContext *ctx, arg_ctzw *a)
{
REQUIRE_64BIT(ctx);
REQUIRE_EXT(ctx, RVB);
return gen_unary(ctx, a, gen_ctzw);
}

38
target/riscv/translate.c
View file

@ -548,6 +548,19 @@ static bool gen_arith_div_uw(DisasContext *ctx, arg_r *a,
return true;
}
static void gen_ctzw(TCGv ret, TCGv arg1)
{
tcg_gen_ori_tl(ret, arg1, (target_ulong)MAKE_64BIT_MASK(32, 32));
tcg_gen_ctzi_tl(ret, ret, 64);
}
static void gen_clzw(TCGv ret, TCGv arg1)
{
tcg_gen_ext32u_tl(ret, arg1);
tcg_gen_clzi_tl(ret, ret, 64);
tcg_gen_subi_tl(ret, ret, 32);
}
static bool gen_arith(DisasContext *ctx, arg_r *a,
void(*func)(TCGv, TCGv, TCGv))
{
@ -593,6 +606,30 @@ static uint32_t opcode_at(DisasContextBase *dcbase, target_ulong pc)
return cpu_ldl_code(env, pc);
}
static void gen_ctz(TCGv ret, TCGv arg1)
{
tcg_gen_ctzi_tl(ret, arg1, TARGET_LONG_BITS);
}
static void gen_clz(TCGv ret, TCGv arg1)
{
tcg_gen_clzi_tl(ret, arg1, TARGET_LONG_BITS);
}
static bool gen_unary(DisasContext *ctx, arg_r2 *a,
void(*func)(TCGv, TCGv))
{
TCGv source = tcg_temp_new();
gen_get_gpr(source, a->rs1);
(*func)(source, source);
gen_set_gpr(a->rd, source);
tcg_temp_free(source);
return true;
}
/* Include insn module translation function */
#include "insn_trans/trans_rvi.c.inc"
#include "insn_trans/trans_rvm.c.inc"
@ -601,6 +638,7 @@ static uint32_t opcode_at(DisasContextBase *dcbase, target_ulong pc)
#include "insn_trans/trans_rvd.c.inc"
#include "insn_trans/trans_rvh.c.inc"
#include "insn_trans/trans_rvv.c.inc"
#include "insn_trans/trans_rvb.c.inc"
#include "insn_trans/trans_privileged.c.inc"
/* Include the auto-generated decoder for 16 bit insn */