81 lines
2.3 KiB
Plaintext
81 lines
2.3 KiB
Plaintext
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import "RV32IBase.core_desc"
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InsructionSet RV32M extends RV32IBase {
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constants {
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XLEN2
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}
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instructions{
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MUL{
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encoding: b0000001 | rs2[4:0] | rs1[4:0] | b000 | rd[4:0] | b0110011;
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args_disass:"x%rd$d, x%rs1$d, x%rs2$d";
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if(rd != 0){
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val res[XLEN2] <= zext(X[rs1], XLEN2) * zext(X[rs2], XLEN2);
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X[rd]<= zext(res , XLEN);
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}
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}
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MULH {
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encoding: b0000001 | rs2[4:0] | rs1[4:0] | b001 | rd[4:0] | b0110011;
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args_disass:"x%rd$d, x%rs1$d, x%rs2$d";
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if(rd != 0){
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val res[XLEN2] <= sext(X[rs1], XLEN2) * sext(X[rs2], XLEN2);
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X[rd]<= zext(res >> XLEN, XLEN);
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}
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}
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MULHSU {
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encoding: b0000001 | rs2[4:0] | rs1[4:0] | b010 | rd[4:0] | b0110011;
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args_disass:"x%rd$d, x%rs1$d, x%rs2$d";
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if(rd != 0){
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val res[XLEN2] <= sext(X[rs1], XLEN2) * zext(X[rs2], XLEN2);
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X[rd]<= zext(res >> XLEN, XLEN);
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}
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}
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MULHU {
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encoding: b0000001 | rs2[4:0] | rs1[4:0] | b011 | rd[4:0] | b0110011;
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args_disass:"x%rd$d, x%rs1$d, x%rs2$d";
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if(rd != 0){
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val res[XLEN2] <= zext(X[rs1], XLEN2) * zext(X[rs2], XLEN2);
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X[rd]<= zext(res >> XLEN, XLEN);
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}
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}
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DIV {
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encoding: b0000001 | rs2[4:0] | rs1[4:0] | b100 | rd[4:0] | b0110011;
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args_disass:"x%rd$d, x%rs1$d, x%rs2$d";
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if(rd != 0){
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if(X[rs2]!=0)
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X[rd] <= sext(X[rs1], 32) / sext(X[rs2], 32);
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else
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X[rd] <= -1;
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}
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}
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DIVU {
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encoding: b0000001 | rs2[4:0] | rs1[4:0] | b101 | rd[4:0] | b0110011;
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args_disass:"x%rd$d, x%rs1$d, x%rs2$d";
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if(rd != 0){
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if(X[rs2]!=0)
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X[rd] <= zext(X[rs1], 32) / zext(X[rs2], 32);
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else
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X[rd] <= -1;
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}
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}
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REM {
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encoding: b0000001 | rs2[4:0] | rs1[4:0] | b110 | rd[4:0] | b0110011;
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args_disass:"x%rd$d, x%rs1$d, x%rs2$d";
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if(rd != 0){
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if(X[rs2]!=0)
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X[rd] <= sext(X[rs1], 32) % sext(X[rs2], 32);
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else
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X[rd] <= X[rs1];
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}
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}
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REMU {
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encoding: b0000001 | rs2[4:0] | rs1[4:0] | b111 | rd[4:0] | b0110011;
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args_disass:"x%rd$d, x%rs1$d, x%rs2$d";
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if(rd != 0){
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if(X[rs2]!=0)
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X[rd] <= zext(X[rs1], 32) % zext(X[rs2], 32);
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else
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X[rd] <= X[rs1];
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}
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}
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}
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}
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