c.sub

Subtract

This instruction is defined by:

Encoding

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Synopsis

Subtract the value in rs2 from rd, and store the result in rd. The rd and rs2 register indexes should be used as rd+8 and rs2+8 (registers x8-x15). C.SUB expands into sub rd, rd, rs2.

Access

M

HS

U

VS

VU

Always

Always

Always

Always

Always

Decode Variables

Bits<3> rs2 = $encoding[4:2];
Bits<3> rd = $encoding[9:7];

Execution

  • Pruned, XLEN == 64

  • Original

XReg t0 = X[%%LINK%func;creg2reg;creg2reg%%(rd)];
XReg t1 = X[%%LINK%func;creg2reg;creg2reg%%(rs2)];
X[%%LINK%func;creg2reg;creg2reg%%(rd)] = t0 - t1;
XReg t0 = X[%%LINK%func;creg2reg;creg2reg%%(rd)];
XReg t1 = X[%%LINK%func;creg2reg;creg2reg%%(rs2)];
X[%%LINK%func;creg2reg;creg2reg%%(rd)] = t0 - t1;