subw

Subtract word

This instruction is defined by:

Encoding

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Synopsis

Subtract the 32-bit values in xs2 from xs1, and store the sign-extended result in xd

Access

M

HS

U

VS

VU

Always

Always

Always

Always

Always

Decode Variables

Bits<5> xs2 = $encoding[24:20];
Bits<5> xs1 = $encoding[19:15];
Bits<5> xd = $encoding[11:7];

Execution

  • Pruned, XLEN == 64

  • Original

Bits<32> t0 = X[xs1][31:0];
Bits<32> t1 = X[xs2][31:0];
X[xd] = %%LINK%func;sext;sext%%(t0 - t1, 31);
Bits<32> t0 = X[xs1][31:0];
Bits<32> t1 = X[xs2][31:0];
X[xd] = %%LINK%func;sext;sext%%(t0 - t1, 31);