UM0434 datasheet(120/390 Pages) STMICROELECTRONICS

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UM0434

Instruction model

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converting between floating-point, integer, and fractional values. Sharing GPRs allows

vector floating-point instructions to use SPE load and store instructions.

The two SPFP APUs are described as follows:

●

Vector SPFP instructions operate on a vector of two 32-bit, single-precision floating-

point numbers that reside in the upper and lower halves of the 64-bit GPRs. These

instructions are listed in

Table 107 alongside their scalar equivalents.

●

Scalar SPFP instructions operate on single 32-bit operands that reside in the lower 32

bits of the GPRs. These instructions are listed in

Table 107.

Note:

Both the vector and scalar versions of the instructions have the same syntax.

Table 107.

Vector and scalar SPFP APU floating-point instructions

Instruction

Mnemonic

Syntax

Scalar

Vector

Convert Floating-Point from Signed Fraction

efscfsf

evfscfsf

rD,rB

Convert Floating-Point from Signed Integer

efscfsi

evfscfsi

rD,rB

Convert Floating-Point from Unsigned Fraction

efscfuf

evfscfuf

rD,rB

Convert Floating-Point from Unsigned Integer

efscfui

evfscfui

rD,rB

Convert Floating-Point to Signed Fraction

efsctsf

evfsctsf

rD,rB

Convert Floating-Point to Signed Integer

efsctsi

evfsctsi

rD,rB

Convert Floating-Point to Signed Integer with Round toward Zero

efsctsiz

evfsctsiz

rD,rB

Convert Floating-Point to Unsigned Fraction

efsctuf

evfsctuf

rD,rB

Convert Floating-Point to Unsigned Integer

efsctui

evfsctui

rD,rB

Convert Floating-Point to Unsigned Integer with Round toward Zero

efsctuiz

evfsctuiz

rD,rB

Floating-Point Absolute Value

efsabs

evfsabs

rD,rA

Floating-Point Add

efsadd

evfsadd

rD,rA,rB

Floating-Point Compare Equal

efscmpeq

evfscmpeq

crD,rA,rB

Floating-Point Compare Greater Than

efscmpgt

evfscmpgt

crD,rA,rB

Floating-Point Compare Less Than

efscmplt

evfscmplt

crD,rA,rB

Floating-Point Divide

efsdiv

evfsdiv

rD,rA,rB

Floating-Point Multiply

efsmul

evfsmul

rD,rA,rB

Floating-Point Negate

efsneg

evfsneg

rD,rA

Floating-Point Negative Absolute Value

efsnabs

evfsnabs

rD,rA

Floating-Point Subtract

efssub

evfssub

rD,rA,rB

Floating-Point Test Equal

efststeq

evfststeq

crD,rA,rB

Floating-Point Test Greater Than

efststgt

evfststgt

crD,rA,rB

Floating-Point Test Less Than

efststlt

evfststlt

crD,rA,rB

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