fmul.s

Floating-Point Multiply Single-Precision

This instruction is defined by:

Encoding

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Synopsis

The fmul.s instruction performs the single-precision floating-point multiplication between fs1 and fs2, and writes the result in fd.

Access

M HS U VS VU

Always

Always

Always

Always

Always

Decode Variables

Bits<5> fs2 = $encoding[24:20];
Bits<5> fs1 = $encoding[19:15];
Bits<3> rm = $encoding[14:12];
Bits<5> fd = $encoding[11:7];

Execution

  • Pruned, XLEN == 64

  • Original

check_f_ok($encoding);
RoundingMode mode = rm_to_mode(rm, $encoding);
F[fd] = f32_mul(F[fs1], F[fs2], mode);
mark_f_state_dirty();
check_f_ok($encoding);
RoundingMode mode = rm_to_mode(rm, $encoding);
F[fd] = f32_mul(F[fs1], F[fs2], mode);
mark_f_state_dirty();

Exceptions

This instruction may result in the following synchronous exceptions:

  • IllegalInstruction