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I-type switch

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inixyz
2023-10-22 17:19:34 +03:00
parent f2fbde2e97
commit 91f5efa8e7
1 changed files with 16 additions and 1 deletions
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17
src/tinyriscv.h
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@@ -221,7 +221,22 @@ void step(){
switch(opcode){
case /*R-type*/ 0x33:
switch(func3){
case /*ADDI*/ 0x0: x[rd] = x[rs1] + (i32)imm; break;
case /*SLTI*/ 0x2000: x[rd] = (i32)x[rs1] < (i32)imm; break;
case /*SLTIU*/ 0x3000: x[rd] = x[rs1] < (u32)(i32)imm; break;
case /*XORI*/ 0x4000: x[rd] = x[rs1] ^ (i32)imm; break;
case /*ORI*/ 0x6000: x[rd] = x[rs1] | (i32)imm; break;
case /*ANDI*/ 0x7000: x[rd] = x[rs1] & (i32)imm; break;
default:
switch(funct7 | funct3){
case /*SLLI*/ 0x1000: x[rd] = x[rs1] << rs2; break;
case /*SRLI*/ 0x5000: x[rd] = x[rs1] >> rs2; break;
case /*SRAI*/ 0x40005000: x[rd] = (i32)x[rs1] >> rs2; break;
}
}
//TODO put this in inline functions , R-type() etc
switch(funct7 | funct3){
case /*ADD*/ 0x0: x[rd] = x[rs1] + x[rs2]; break;