c.subw

Subtract word

This instruction is defined by:

Encoding

Synopsis

Subtract the 32-bit values 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.SUBW expands into subw rd, rd, rs2.

Access

Always

Decode Variables

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

Execution

Pruned, XLEN == 64
Original

Bits<32> t0 = X[%%LINK%func;creg2reg;creg2reg%%(rd)][31:0];
Bits<32> t1 = X[%%LINK%func;creg2reg;creg2reg%%(rs2)][31:0];
X[%%LINK%func;creg2reg;creg2reg%%(rd)] = %%LINK%func;sext;sext%%(t0 - t1, 31);

Bits<32> t0 = X[%%LINK%func;creg2reg;creg2reg%%(rd)][31:0];
Bits<32> t1 = X[%%LINK%func;creg2reg;creg2reg%%(rs2)][31:0];
X[%%LINK%func;creg2reg;creg2reg%%(rd)] = %%LINK%func;sext;sext%%(t0 - t1, 31);