Xilinx MicroBlaze Reference Manual page 233

fint Floating-Point Convert Float to Integer
rD, rA
fint
0 1 0 1 1 0
0
6
Description
Converts the floating-point number in register rA to a signed integer and puts the result in register rD.
This is a 32-bit signed conversion that will produce a 32-bit integer result.
Pseudocode
if isDnz(rA) then
←
(rD) 0xFFC00000
←
FSR[DO]
←
ESR[EC]
else if isNaN(rA) then
←
(rD) 0xFFC00000
←
FSR[IO]
←
ESR[EC]
else if isInf(rA) or (rA) < -2
←
(rD) 0xFFC00000
←
FSR[IO]
←
ESR[EC]
else
←
(rD) int ((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
• 5 cycles with
• 7 cycles with
• 2 cycles with
Note
This instruction is only available when the MicroBlaze parameter C_USE_FPU is set to 2 (Extended).
MicroBlaze Processor Reference Guide
UG984 (v2018.2) June 21, 2018
rD rA
11
1
00110
1
00110
31
or (rA) > 2
1
00110
=0
C_AREA_OPTIMIZED
=1
C_AREA_OPTIMIZED
=2
C_AREA_OPTIMIZED
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Chapter 5: MicroBlaze Instruction Set Architecture
rB 0 1 1 0 0 0 0 0 0 0 0
16 21
31
- 1 then
31
234
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