From 54a9ce0f683ab69b0a16e59f5ef28c1ded604def Mon Sep 17 00:00:00 2001 From: Alistair Francis Date: Wed, 19 Dec 2018 19:17:43 +0000 Subject: tcg/riscv: Add the immediate encoders Signed-off-by: Alistair Francis Signed-off-by: Michael Clark Reviewed-by: Richard Henderson Message-Id: Signed-off-by: Richard Henderson --- tcg/riscv/tcg-target.inc.c | 90 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 90 insertions(+) (limited to 'tcg/riscv') diff --git a/tcg/riscv/tcg-target.inc.c b/tcg/riscv/tcg-target.inc.c index f853d01803..08838027cd 100644 --- a/tcg/riscv/tcg-target.inc.c +++ b/tcg/riscv/tcg-target.inc.c @@ -284,3 +284,93 @@ typedef enum { OPC_FENCE = 0x0000000f, } RISCVInsn; + +/* + * RISC-V immediate and instruction encoders (excludes 16-bit RVC) + */ + +/* Type-R */ + +static int32_t encode_r(RISCVInsn opc, TCGReg rd, TCGReg rs1, TCGReg rs2) +{ + return opc | (rd & 0x1f) << 7 | (rs1 & 0x1f) << 15 | (rs2 & 0x1f) << 20; +} + +/* Type-I */ + +static int32_t encode_imm12(uint32_t imm) +{ + return (imm & 0xfff) << 20; +} + +static int32_t encode_i(RISCVInsn opc, TCGReg rd, TCGReg rs1, uint32_t imm) +{ + return opc | (rd & 0x1f) << 7 | (rs1 & 0x1f) << 15 | encode_imm12(imm); +} + +/* Type-S */ + +static int32_t encode_simm12(uint32_t imm) +{ + int32_t ret = 0; + + ret |= (imm & 0xFE0) << 20; + ret |= (imm & 0x1F) << 7; + + return ret; +} + +static int32_t encode_s(RISCVInsn opc, TCGReg rs1, TCGReg rs2, uint32_t imm) +{ + return opc | (rs1 & 0x1f) << 15 | (rs2 & 0x1f) << 20 | encode_simm12(imm); +} + +/* Type-SB */ + +static int32_t encode_sbimm12(uint32_t imm) +{ + int32_t ret = 0; + + ret |= (imm & 0x1000) << 19; + ret |= (imm & 0x7e0) << 20; + ret |= (imm & 0x1e) << 7; + ret |= (imm & 0x800) >> 4; + + return ret; +} + +static int32_t encode_sb(RISCVInsn opc, TCGReg rs1, TCGReg rs2, uint32_t imm) +{ + return opc | (rs1 & 0x1f) << 15 | (rs2 & 0x1f) << 20 | encode_sbimm12(imm); +} + +/* Type-U */ + +static int32_t encode_uimm20(uint32_t imm) +{ + return imm & 0xfffff000; +} + +static int32_t encode_u(RISCVInsn opc, TCGReg rd, uint32_t imm) +{ + return opc | (rd & 0x1f) << 7 | encode_uimm20(imm); +} + +/* Type-UJ */ + +static int32_t encode_ujimm20(uint32_t imm) +{ + int32_t ret = 0; + + ret |= (imm & 0x0007fe) << (21 - 1); + ret |= (imm & 0x000800) << (20 - 11); + ret |= (imm & 0x0ff000) << (12 - 12); + ret |= (imm & 0x100000) << (31 - 20); + + return ret; +} + +static int32_t encode_uj(RISCVInsn opc, TCGReg rd, uint32_t imm) +{ + return opc | (rd & 0x1f) << 7 | encode_ujimm20(imm); +} -- cgit v1.2.3-55-g7522