Atmel Xplained Pro Evaluation Kit ATSAM4E-XPRO ATSAM4E-XPRO Data Sheet

SAM4E [DATASHEET]

Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14

184

Compares two floating-point registers, or one floating-point register and zero.

Syntax

VCMP{E}{cond}.F32 Sd, Sm

VCMP{E}{cond}.F32 Sd, #0.0

where:

cond

is an optional condition code, see 

.

E

If present, any NaN operand causes an Invalid Operation exception.
Otherwise, only a signaling NaN causes the exception.

Sd

is the floating-point operand to compare.

Sm

is the floating-point operand that is compared with.

Operation

This instruction: 

1.

Compares:

̶

Two floating-point registers.

̶

One floating-point register and zero.

2.

Writes the result to the 

FPSCR

 flags.

Restrictions

This instruction can optionally raise an 

Invalid Operation

 exception if either operand is any type of 

NaN

. It always raises

an 

Invalid Operation

 exception if either operand is a signaling 

NaN

.

Condition Flags

When this instruction writes the result to the 

FPSCR

 flags, the values are normally transferred to the ARM flags by a

subsequent 

VMRS

 instruction, see 

Examples

VCMP.F32    S4, #0.0

VCMP.F32    S4, S2