divuw
Unsigned 32-bit division
This instruction is defined by:
Synopsis
Divide the unsigned 32-bit values in xs1 and xs2, and store the sign-extended result in xd.
The remainder is discarded.
If the value in xs2 is zero, xd is written with all 1s.
Decode Variables
Bits<5> xs2 = $encoding[24:20];
Bits<5> xs1 = $encoding[19:15];
Bits<5> xd = $encoding[11:7];Execution
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Pruned, XLEN == 64
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Original
if (implemented?(ExtensionName::M) && (misa.M == 1'b0)) {
raise(ExceptionCode::IllegalInstruction, mode(), $encoding);
}
Bits<32> src1 = X[xs1][31:0];
Bits<32> src2 = X[xs2][31:0];
if (src2 == 0) {
X[xd] = {64{1'b1}};
} else {
Bits<32> result = src1 / src2;
Bits<1> sign_bit = result[31];
X[xd] = {{32{sign_bit}}, result};
}if (implemented?(ExtensionName::M) && (misa.M == 1'b0)) {
raise(ExceptionCode::IllegalInstruction, mode(), $encoding);
}
Bits<32> src1 = X[xs1][31:0];
Bits<32> src2 = X[xs2][31:0];
if (src2 == 0) {
X[xd] = {64{1'b1}};
} else {
Bits<32> result = src1 / src2;
Bits<1> sign_bit = result[31];
X[xd] = {{32{sign_bit}}, result};
}