sub

Subtract

Subtract the value in xs2 from xs1, and store the result in xd

This instruction must have data-independent timing when extension Zkt is enabled.

Assembly format

sub xd, xs1, xs2

Decode Variables

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

Execution

XReg t0 = X[xs1];
XReg t1 = X[xs2];
X[xd] = t0 - t1;

Encoding

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Defining extension

I

Access

M

Always

Containing profiles

  • Mandatory: RVA20S64, RVA20U64, RVA22S64, RVA22U64, RVA23S64, RVA23U64, RVB23S64, RVB23U64, RVI20U32, RVI20U64

  • Optional: None