ARM VERSION 1.2 Datový list stáhnout pdf (Strana 205)

Floating-point Support

5.2.4 Floating-point comparisons

The routines in Table 5-4 perform comparisons between floating-point numbers.

Table 5-4 Floating-point comparison routines

Function Argument types Result type Condition tested

_fcmpeq

float

Flags, EQ/NE

x equal to y

_fcmpge

float

Flags, HS/LO

x greater than or equal to y

a,b

_fcmple

float

Flags, HI/LS

x less than or equal to y

a,b

_feq

float

Boolean x equal to y

_fneq

float

Boolean x not equal to y

_fgeq

float

Boolean

x greater than or equal to y

_fgr

float

Boolean

x greater than y

_fleq

float

Boolean

x less than or equal to y

_fls

float

Boolean

x less than y

_dcmpeq

double

Flags, EQ/NE

x equal to y

_dcmpge

double

Flags, HS/LO

x greater than or equal to y

a,b

_dcmple

double

Flags, HI/LS

x less than or equal to y

a,b

_deq

double

Boolean x equal to y

_dneq

double

Boolean x not equal to y

_dgeq

double

Boolean

x greater than or equal to y

_dgr

double

Boolean

x greater than y

_dleq

double

Boolean

x less than or equal to y

_dls

double

Boolean

x less than y

a. Returns results in the ARM condition flags. This is efficient in assembly language, because you can directly follow a call to

the function with a conditional instruction, but it means there is no way to use these functions from C. These functions are not

declared in

rt_fp.h

b. Causes an Invalid Operation exception if either argument is a NaN, even a quiet NaN. Other functions only cause Invalid

Operation if an argument is an SNaN. QNaNs return not equal when compared to anything, including other QNaNs (so

comparing a QNaN to the same QNaN still returns not equal).

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