FSGNJN.D
Float Sign Injection Negate (Double)
FSGNJN.D rd, rs1, rs2
Injects the *negated* sign of rs2 into rs1 (Double Precision).
Encoding
Binary Layout
0010001
31:25
rs2
24:20
rs1
19:15
001
14:12
rd
11:7
1010011
6:0
Operands
-
rd
Destination register (integer) -
rs1
Source (Body) -
rs2
Source (Sign)
Example
FSGNJN.D f0, f1, f1
// Negate f1 (f0 = -f1).
Related
More in D
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][63], F[rs1][62:0]};