UM0434 datasheet(48/390 Pages) STMICROELECTRONICS

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UM0434

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CR setting for integer instructions

For all integer word instructions with the Rc bit defined and set, and for addic., andi., and

andis., CR0[32–34] are set by signed comparison of bits 32–63 of the result to zero; CR[35]

is copied from the final state of XER[SO]. The Rc bit is not defined for double-word integer

operations.

(target_register)32–63 < 0 then c ← 0b100

else if (target_register)32–63 > 0 then c ← 0b010

else

← 0b001

CR0

← c || XER

The value of any undefined portion of the result is undefined, and the value placed into the

first three bits of CR0 is undefined. CR0 bits are interpreted as described in

Table 17.

CR1[2]

00110

Zero (EQ)—For SPE and SPFP compare and test instructions:

Set to the OR of the result of the compare of the high and low elements.

CR1[3]

00111

Summary overflow (SO)—For SPE and SPFP compare and test instructions:

Set to the AND of the result of the compare of the high and low elements.

n[0]

01000

01100

10000

10100

11000

11100

Less than (LT)

For integer compare instructions:

rA < SIMM or rB (signed comparison) or rA < UIMM or rB (unsigned comparison).

For SPE and SPFP compare and test instructions:

Set if the high-order element of rA = the high-order element of rB; cleared otherwise.

n[1]

01001

01101

10001

10101

11001

11101

Greater than (GT)

For integer compare instructions:

rA > SIMM or rB (signed comparison) or rA > UIMM or rB (unsigned comparison).

For SPE and SPFP compare and test instructions:

Set if the low-order element of rA = the low-order element of rB; cleared otherwise.

n[2]

01010

01110

10010

10110

11010

11110

Equal (EQ)

For integer compare instructions: rA = SIMM, UIMM, or rB.

For SPE and SPFP compare and test instructions:

Set to the OR of the result of the compare of the high and low elements.

n[3]

01011

01111

10011

10111

11011

11111

Summary overflow (SO).

For integer compare instructions, this is a copy of XER[SO] at the completion of the

instruction.

For SPE and SPFP vector compare and test instructions:

Set to the AND of the result of the compare of the high and low elements.

Table 16.

BI operand settings for CR fields (continued)

Bits

Description

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