Boxis R700 Manuel d'utilisateur télécharger pdf (Page 77)

ATI R700 Technology

ALU Instructions 4-19

// Any constant, including literal and inline constants

if $const_count >= 2

assert “More than two references to a constant in

transcendental operation.”;

$const_count++;

if iscfile($sel)

reserve_cfile($sel, $elem);

for $src in {0, ..., number_of_operands(ALU_INST)}

$sel := SRC$src_SEL;

$elem := SRC$src_ELEM;

if isgpr($sel)

$cycle := cycle_for_bank_swizzle(BANK_SWIZZLE, $src);

if $cycle < $const_count

assert “Cycle $cycle for GPR load conflicts with

constant

load in transcendental operation.”;

reserve_gpr($sel, $elem, $cycle);

elsif isconst($sel)

// Constants already processed

else

// No restrictions on PV, PS

end

4.8 ALU Instructions

This section gives a brief summary of ALU instructions. See Section 9.2, “ALU

Instructions,” page 9-42, for details about the instructions.

4.8.1 Instructions for All ALU Units

The instructions shown in Table 4.4 are valid for all ALU units: ALU.[X,Y,Z,W]

units and ALU.Trans units. All of the instruction mnemonics in this table have an

OP2_INST_ or OP3_INST_ prefix that is not shown here.

Table 4.4 ALU Instructions (ALU.[X,Y,Z,W] and ALU.Trans Units)

Mnemonic Description

Integer Operations

AND_INT Logical bit-wise AND.

ASHR_INT Scalar arithmetic shift right. The sign bit is shifted into the vacated locations. src1

is interpreted as an unsigned integer. The component-wise shift right of each 32-bit

value in src0 by an unsigned integer bit count is provided by the LSB 5 bits (0-31

range) in src1.selected_component, inserting 0.

CNDE_INT Integer conditional move equal based on integer (either signed or unsigned).

CNDE Conditional move equal based on floating point compare of first argument being

equal to 0.0.

CNDGE_INT Integer conditional move greater than or equal based on signed integer values.

CNDGE Conditional move equal based on floating point compare of first argument being

greater than, or equal to, 0.0.

CNDGT_INT Integer conditional move greater than based on signed integer values.

1 2 ... 72 73 74 75 76 77 78 79 80 81 82 ... 391 392

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Boxis R700 Manuel d'utilisateur Page 77

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