UM0434 datasheet(27/390 Pages) STMICROELECTRONICS

27 / 390 page

e200z3 core complex overview

UM0434

28/391

(UISA). The e200z3 does not include the Book E floating-point, load string, or store

string instructions.

●

The e200z3 supports the following EIS-defined instructions:

–

Integer select APU. This APU consists of the Integer Select instruction (isel),

which functions as an if-then-else statement that selects between two source

registers by comparison to a CR bit. This instruction eliminates conditional

branches, takes fewer clock cycles than the equivalent coding, and reduces the

code footprint.

–

Debug APU. This APU defines the Return from Debug Interrupt instruction (rfdi).

–

SPE APU vector instructions. New vector instructions are defined that view the 64-

bit GPRs as being composed of a vector of two 32-bit elements (some of the

instructions also read or write 16-bit elements). Some scalar instructions are

defined for DSP that produce a 64-bit scalar result.

–

The embedded floating-point APUs provide single-precision scalar and vector

floating-point instructions. Scalar floating-point instructions use only the lower 32

bits of the GPRs for single-precision floating-point calculations. <Cross

Refs>Table 3 lists embedded floating-point instructions.

–

e200z3 implements eight additional (four scalar and four vector) floating-point

APU instructions.

Table 3.

Scalar and vector embedded floating-point APU 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

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