remuw
Unsigned 32-bit remainder
This instruction is defined by:
Synopsis
Calculate the remainder of unsigned division of the 32-bit values in rs1 by rs2, and store the sign-extended result in rd.
If the value in rs2 is zero, rd gets the sign-extended value in rs1.
Decode Variables
Bits<5> rs2 = $encoding[24:20];
Bits<5> rs1 = $encoding[19:15];
Bits<5> rd = $encoding[11:7];Execution
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Pruned, XLEN == 64
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Original
if ((%%LINK%csr_field;misa.M;CSR[misa].M%% == 1'b0)) {
%%LINK%func;raise;raise%%(ExceptionCode::IllegalInstruction, %%LINK%func;mode;mode%%(), $encoding);
}
Bits<32> src1 = X[rs1][31:0];
Bits<32> src2 = X[rs2][31:0];
if (src2 == 0) {
Bits<1> sign_bit = src1[31];
X[rd] = {{32{sign_bit}}, src1};
} else {
Bits<32> result = src1 % src2;
Bits<1> sign_bit = result[31];
X[rd] = {{32{sign_bit}}, result};
}if (%%LINK%func;implemented?;implemented?%%(ExtensionName::M) && (%%LINK%csr_field;misa.M;CSR[misa].M%% == 1'b0)) {
%%LINK%func;raise;raise%%(ExceptionCode::IllegalInstruction, %%LINK%func;mode;mode%%(), $encoding);
}
Bits<32> src1 = X[rs1][31:0];
Bits<32> src2 = X[rs2][31:0];
if (src2 == 0) {
Bits<1> sign_bit = src1[31];
X[rd] = {{32{sign_bit}}, src1};
} else {
Bits<32> result = src1 % src2;
Bits<1> sign_bit = result[31];
X[rd] = {{32{sign_bit}}, result};
}