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X-Received-From: 216.71.153.144 Subject: [Qemu-devel] [PATCH v1 11/23] riscv: tcg-target: Add the mov and movi instruction X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "alistair23@gmail.com" , "richard.henderson@linaro.org" , Alistair Francis Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (found 2 invalid signatures) Content-Type: text/plain; charset="utf-8" Signed-off-by: Alistair Francis Signed-off-by: Michael Clark Signed-off-by: Richard Henderson --- tcg/riscv/tcg-target.inc.c | 85 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 85 insertions(+) diff --git a/tcg/riscv/tcg-target.inc.c b/tcg/riscv/tcg-target.inc.c index e6ad5f8e4c..9baa8a19c4 100644 --- a/tcg/riscv/tcg-target.inc.c +++ b/tcg/riscv/tcg-target.inc.c @@ -497,3 +497,88 @@ static void patch_reloc(tcg_insn_unit *code_ptr, int t= ype, tcg_abort(); } } + +/* + * TCG intrinsics + */ + +static void tcg_out_mov(TCGContext *s, TCGType type, TCGReg ret, TCGReg ar= g) +{ + if (ret =3D=3D arg) { + return; + } + switch (type) { + case TCG_TYPE_I32: + case TCG_TYPE_I64: + tcg_out_opc_imm(s, OPC_ADDI, ret, arg, 0); + break; + default: + g_assert_not_reached(); + } +} + +static void tcg_out_movi(TCGContext *s, TCGType type, TCGReg rd, + tcg_target_long val) +{ + tcg_target_long lo, hi, tmp; + int shift; + + if (TCG_TARGET_REG_BITS =3D=3D 64 && type =3D=3D TCG_TYPE_I32) { + val =3D (int32_t)val; + } + + lo =3D sextreg(val, 0, 12); + if (val =3D=3D lo) { + tcg_out_opc_imm(s, OPC_ADDI, rd, TCG_REG_ZERO, lo); + return; + } + + hi =3D val - lo; + if (TCG_TARGET_REG_BITS =3D=3D 32 || val =3D=3D (int32_t)val) { + tcg_out_opc_upper(s, OPC_LUI, rd, hi); + if (lo !=3D 0) { + tcg_out_opc_imm(s, OPC_ADDIW, rd, rd, lo); + } + return; + } + + /* We can only be here if TCG_TARGET_REG_BITS !=3D 32 */ + tmp =3D tcg_pcrel_diff(s, (void *)val); + if (tmp =3D=3D (int32_t)tmp) { + tcg_out_opc_upper(s, OPC_AUIPC, rd, 0); + tcg_out_opc_imm(s, OPC_ADDI, rd, rd, 0); + reloc_call(s->code_ptr - 2, (tcg_insn_unit *)val); + return; + } + + /* Look for a single 20-bit section. */ + shift =3D ctz64(val); + tmp =3D val >> shift; + if (tmp =3D=3D sextreg(tmp, 0, 20)) { + tcg_out_opc_upper(s, OPC_LUI, rd, tmp << 12); + if (shift > 12) { + tcg_out_opc_imm(s, OPC_SLLI, rd, rd, shift - 12); + } else { + tcg_out_opc_imm(s, OPC_SRAI, rd, rd, 12 - shift); + } + return; + } + + /* Look for a few high zero bits, with lots of bits set in the middle.= */ + shift =3D clz64(val); + tmp =3D val << shift; + if (tmp =3D=3D sextreg(tmp, 12, 20) << 12) { + tcg_out_opc_upper(s, OPC_LUI, rd, tmp); + tcg_out_opc_imm(s, OPC_SRLI, rd, rd, shift); + return; + } else if (tmp =3D=3D sextreg(tmp, 0, 12)) { + tcg_out_opc_imm(s, OPC_ADDI, rd, TCG_REG_ZERO, tmp); + tcg_out_opc_imm(s, OPC_SRLI, rd, rd, shift); + return; + } + + /* Drop into the constant pool. */ + new_pool_label(s, val, R_RISCV_CALL, s->code_ptr, 0); + tcg_out_opc_upper(s, OPC_AUIPC, rd, 0); + tcg_out_opc_imm(s, OPC_LD, rd, rd, 0); +} --=20 2.19.1