Figure 1. fsqrt
Description
Performs a floating-point square root on the value in rA and puts the result in register rD.
Pseudocode
if isDnz(rA) then
(rD) ← 0xFFC00000
FSR[DO] ← 1
ESR[EC] ← 00110
else if isSigNaN(rA) then
(rD) ← 0xFFC00000
FSR[IO] ← 1
ESR[EC] ← 00110
else if isQuietNaN(rA) then
(rD) ← 0xFFC00000
else if (rA) < 0 then
(rD) ← 0xFFC00000
FSR[IO] ← 1
ESR[EC] ← 00110
else if (rA) = -0 then
(rD) ← -0
else
(rD) ← sqrt ((rA))Registers Altered
- rD, unless an FP exception is generated, in which case the register is unchanged
- ESR[EC], if an FP exception is generated
- FSR[IO,DO]
Latency
- 27 cycles with
C_AREA_OPTIMIZED=0 - 29 cycles with
C_AREA_OPTIMIZED=1 - 23 cycles with
C_AREA_OPTIMIZED=2
Note
This instruction is only available when the MicroBlaze parameter
C_USE_FPU is set to 2 (Extended).