%load-immediate ( reg val -- )

Vocabulary

cpu.architecture

Inputs

reg	a register symbol
val	a value

Outputs

None

Word description

Emits code for loading an immediate value into a register. On x86, if val is 0, then an XOR instruction is emitted instead of MOV because the former is shorter.

See also

##load-tagged

Definition

USING: system ;

IN: cpu.architecture

HOOK: %load-immediate cpu ( reg val -- )

Methods

USING: assocs cpu.architecture cpu.arm.64.assembler kernel math
sequences system ;

M: arm.64 %load-immediate
    [ XZR MOVr ] [
        { 0 1 2 3 } [ tuck -16 * shift 65535 bitand ] with
        map>alist [ 0 = ] reject-values
        unclip overd first2 rot MOVZ [ first2 rot MOVK ] with
        each
    ] if-zero ;


USING: cpu.architecture cpu.x86.assembler
cpu.x86.assembler.operands kernel kernel.private math system ;

M: x86 %load-immediate
    { fixnum } declare
    [ 32-bit-version-of dup XOR ] [ MOV ] if-zero ;