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add custom instruction

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This commit is contained in:
Michael
2026-04-14 00:04:38 +02:00
parent d50bacb089
commit 37e91de03d
1 changed files with 14 additions and 0 deletions
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14
src/tinyriscv.h
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@@ -89,6 +89,17 @@ inline void tinyriscv_I_type(const u8 funct3, const u8 funct7, u32* x,
//////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////
__attribute__((always_inline))
inline void tinyriscv_custom_I_type(const u8 funct3, const u8 funct7, u32* x,
const u8 rd, const u8 rs1, const i16 imm, const u8 shamt){
switch (funct3) {
case /*CUSTOM XOR*/ 0: x[rd] = ((x[rs1] << (i32)imm) ^ 0xFF) >> (i32)imm; break;
}
}
////////////////////////////////////////////////////////////////////////////////
__attribute__((always_inline)) __attribute__((always_inline))
inline void tinyriscv_R_type(const u8 funct3, const u8 funct7, u32* x, inline void tinyriscv_R_type(const u8 funct3, const u8 funct7, u32* x,
const u8 rd, const u8 rs1, const u8 rs2){ const u8 rd, const u8 rs1, const u8 rs2){
@@ -199,6 +210,9 @@ void tinyriscv_step(tinyriscv_core* core){
case /*I-type*/ 0x13: case /*I-type*/ 0x13:
tinyriscv_I_type(funct3, funct7, core->x, rd, rs1, imm_i, rs2); tinyriscv_I_type(funct3, funct7, core->x, rd, rs1, imm_i, rs2);
break; break;
case /*Custom-I-type*/ 0x0B:
tinyriscv_custom_I_type(funct3, funct7, core->x, rd, rs1, imm_i, rs2);
break;
case /*R-type*/ 0x33: case /*R-type*/ 0x33:
tinyriscv_R_type(funct3, funct7, core->x, rd, rs1, rs2); tinyriscv_R_type(funct3, funct7, core->x, rd, rs1, rs2);
break; break;