FSGNJN.S

Float Sign Injection Negate (Single)

FSGNJN.S rd, rs1, rs2

Injects the *negated* sign of rs2 into rs1. Used for negation and absolute value.

Encoding

Binary Layout

0010000

31:25

rs2

24:20

rs1

19:15

001

14:12

rd

11:7

1010011

6:0

 

Format R-Type

Opcode 0x20001053

Extension F

Operands

• rd
  Destination register (integer)
• rs1
  Source (Body)
• rs2
  Source (Sign)

Example

FSGNJN.S f1, f2, f2

// Negates f2 (f1 = -f2).

Related

More in F

Reference

View in RISC-V Unprivileged ISA Specification ↗ RISC-V ISA Manual

Description

Produces a result with the magnitude of rs1 and the sign bit taken from the source rs2. Used to implement floating-point absolute value, negate, and copy-sign.

Operation

F[rd] = {~F[rs2][31], F[rs1][30:0]};