! Copyright (C) 2007, 2008 Slava Pestov.
! See http://factorcode.org/license.txt for BSD license.
USING: bootstrap.image.private kernel kernel.private namespaces
system cpu.ppc.assembler compiler.codegen.fixup compiler.units
compiler.constants math math.private layouts words words.private
vocabs slots.private locals.backend ;
IN: bootstrap.ppc

4 \ cell set
big-endian on

4 jit-code-format set

CONSTANT: ds-reg 29
CONSTANT: rs-reg 30

: factor-area-size ( -- n ) 4 bootstrap-cells ;

: stack-frame ( -- n )
    factor-area-size c-area-size + 4 bootstrap-cells align ;

: next-save ( -- n ) stack-frame bootstrap-cell - ;
: xt-save ( -- n ) stack-frame 2 bootstrap-cells - ;

[
    0 6 LOAD32 rc-absolute-ppc-2/2 rt-immediate jit-rel
    11 6 profile-count-offset LWZ
    11 11 1 tag-fixnum ADDI
    11 6 profile-count-offset STW
    11 6 word-code-offset LWZ
    11 11 compiled-header-size ADDI
    11 MTCTR
    BCTR
] jit-profiling jit-define

[
    0 6 LOAD32 rc-absolute-ppc-2/2 rt-this jit-rel
    0 MFLR
    1 1 stack-frame SUBI
    6 1 xt-save STW
    stack-frame 6 LI
    6 1 next-save STW
    0 1 lr-save stack-frame + STW
] jit-prolog jit-define

[
    0 6 LOAD32 rc-absolute-ppc-2/2 rt-immediate jit-rel
    6 ds-reg 4 STWU
] jit-push-immediate jit-define

[
    0 6 LOAD32 rc-absolute-ppc-2/2 rt-stack-chain jit-rel
    7 6 0 LWZ
    1 7 0 STW
] jit-save-stack jit-define

[
    0 6 LOAD32 rc-absolute-ppc-2/2 rt-primitive jit-rel
    6 MTCTR
    BCTR
] jit-primitive jit-define

[ 0 BL rc-relative-ppc-3 rt-xt jit-rel ] jit-word-call jit-define

[ 0 B rc-relative-ppc-3 rt-xt ] jit-word-jump jit-define

[
    3 ds-reg 0 LWZ
    ds-reg dup 4 SUBI
    0 3 \ f tag-number CMPI
    2 BEQ
    0 B rc-relative-ppc-3 rt-xt jit-rel
] jit-if-1 jit-define

[
    0 B rc-relative-ppc-3 rt-xt jit-rel
] jit-if-2 jit-define

: jit-jump-quot ( -- )
    4 3 quot-xt-offset LWZ
    4 MTCTR
    BCTR ;

[
    0 3 LOAD32 rc-absolute-ppc-2/2 rt-immediate jit-rel
    6 ds-reg 0 LWZ
    6 6 1 SRAWI
    3 3 6 ADD
    3 3 array-start-offset LWZ
    ds-reg dup 4 SUBI
    jit-jump-quot
] jit-dispatch jit-define

: jit->r ( -- )
    4 ds-reg 0 LWZ
    ds-reg dup 4 SUBI
    4 rs-reg 4 STWU ;

: jit-2>r ( -- )
    4 ds-reg 0 LWZ
    5 ds-reg -4 LWZ
    ds-reg dup 8 SUBI
    rs-reg dup 8 ADDI
    4 rs-reg 0 STW
    5 rs-reg -4 STW ;

: jit-3>r ( -- )
    4 ds-reg 0 LWZ
    5 ds-reg -4 LWZ
    6 ds-reg -8 LWZ
    ds-reg dup 12 SUBI
    rs-reg dup 12 ADDI
    4 rs-reg 0 STW
    5 rs-reg -4 STW
    6 rs-reg -8 STW ;

: jit-r> ( -- )
    4 rs-reg 0 LWZ
    rs-reg dup 4 SUBI
    4 ds-reg 4 STWU ;

: jit-2r> ( -- )
    4 rs-reg 0 LWZ
    5 rs-reg -4 LWZ
    rs-reg dup 8 SUBI
    ds-reg dup 8 ADDI
    4 ds-reg 0 STW
    5 ds-reg -4 STW ;

: jit-3r> ( -- )
    4 rs-reg 0 LWZ
    5 rs-reg -4 LWZ
    6 rs-reg -8 LWZ
    rs-reg dup 12 SUBI
    ds-reg dup 12 ADDI
    4 ds-reg 0 STW
    5 ds-reg -4 STW
    6 ds-reg -8 STW ;

[
    jit->r
    0 BL rc-relative-ppc-3 rt-xt
    jit-r>
] jit-dip jit-define

[
    jit-2>r
    0 BL rc-relative-ppc-3 rt-xt
    jit-2r>
] jit-2dip jit-define

[
    jit-3>r
    0 BL rc-relative-ppc-3 rt-xt
    jit-3r>
] jit-3dip jit-define

[
    0 1 lr-save stack-frame + LWZ
    1 1 stack-frame ADDI
    0 MTLR
] jit-epilog jit-define

[ BLR ] jit-return jit-define

! Sub-primitives

! Quotations and words
[
    3 ds-reg 0 LWZ
    ds-reg dup 4 SUBI
    jit-jump-quot
] \ (call) define-sub-primitive

[
    3 ds-reg 0 LWZ
    ds-reg dup 4 SUBI
    4 3 word-xt-offset LWZ
    4 MTCTR
    BCTR
] \ (execute) define-sub-primitive

! Objects
[
    3 ds-reg 0 LWZ
    3 3 tag-mask get ANDI
    3 3 tag-bits get SLWI
    3 ds-reg 0 STW
] \ tag define-sub-primitive

[
    3 ds-reg 0 LWZ
    4 ds-reg -4 LWZU
    3 3 1 SRAWI
    4 4 0 0 31 tag-bits get - RLWINM
    4 3 3 LWZX
    3 ds-reg 0 STW
] \ slot define-sub-primitive

! Shufflers
[
    ds-reg dup 4 SUBI
] \ drop define-sub-primitive

[
    ds-reg dup 8 SUBI
] \ 2drop define-sub-primitive

[
    ds-reg dup 12 SUBI
] \ 3drop define-sub-primitive

[
    3 ds-reg 0 LWZ
    3 ds-reg 4 STWU
] \ dup define-sub-primitive

[
    3 ds-reg 0 LWZ
    4 ds-reg -4 LWZ
    ds-reg dup 8 ADDI
    3 ds-reg 0 STW
    4 ds-reg -4 STW
] \ 2dup define-sub-primitive

[
    3 ds-reg 0 LWZ
    4 ds-reg -4 LWZ
    5 ds-reg -8 LWZ
    ds-reg dup 12 ADDI
    3 ds-reg 0 STW
    4 ds-reg -4 STW
    5 ds-reg -8 STW
] \ 3dup define-sub-primitive

[
    3 ds-reg 0 LWZ
    ds-reg dup 4 SUBI
    3 ds-reg 0 STW
] \ nip define-sub-primitive

[
    3 ds-reg 0 LWZ
    ds-reg dup 8 SUBI
    3 ds-reg 0 STW
] \ 2nip define-sub-primitive

[
    3 ds-reg -4 LWZ
    3 ds-reg 4 STWU
] \ over define-sub-primitive

[
    3 ds-reg -8 LWZ
    3 ds-reg 4 STWU
] \ pick define-sub-primitive

[
    3 ds-reg 0 LWZ
    4 ds-reg -4 LWZ
    4 ds-reg 0 STW
    3 ds-reg 4 STWU
] \ dupd define-sub-primitive

[
    3 ds-reg 0 LWZ
    4 ds-reg -4 LWZ
    3 ds-reg 4 STWU
    4 ds-reg -4 STW
    3 ds-reg -8 STW
] \ tuck define-sub-primitive

[
    3 ds-reg 0 LWZ
    4 ds-reg -4 LWZ
    3 ds-reg -4 STW
    4 ds-reg 0 STW
] \ swap define-sub-primitive

[
    3 ds-reg -4 LWZ
    4 ds-reg -8 LWZ
    3 ds-reg -8 STW
    4 ds-reg -4 STW
] \ swapd define-sub-primitive

[
    3 ds-reg 0 LWZ
    4 ds-reg -4 LWZ
    5 ds-reg -8 LWZ
    4 ds-reg -8 STW
    3 ds-reg -4 STW
    5 ds-reg 0 STW
] \ rot define-sub-primitive

[
    3 ds-reg 0 LWZ
    4 ds-reg -4 LWZ
    5 ds-reg -8 LWZ
    3 ds-reg -8 STW
    5 ds-reg -4 STW
    4 ds-reg 0 STW
] \ -rot define-sub-primitive

[ jit->r ] \ load-local define-sub-primitive

! Comparisons
: jit-compare ( insn -- )
    0 3 LOAD32
    4 ds-reg 0 LWZ
    5 ds-reg -4 LWZU
    5 0 4 CMP
    2 swap execute( offset -- ) ! magic number
    \ f tag-number 3 LI
    3 ds-reg 0 STW ;

: define-jit-compare ( insn word -- )
    [ [ jit-compare ] curry rc-absolute-ppc-2/2 rt-immediate 1 ] dip
    define-sub-primitive ;

\ BEQ \ eq? define-jit-compare
\ BGE \ fixnum>= define-jit-compare
\ BLE \ fixnum<= define-jit-compare
\ BGT \ fixnum> define-jit-compare
\ BLT \ fixnum< define-jit-compare

! Math
[
    3 ds-reg 0 LWZ
    ds-reg ds-reg 4 SUBI
    4 ds-reg 0 LWZ
    3 3 4 OR
    3 3 tag-mask get ANDI
    \ f tag-number 4 LI
    0 3 0 CMPI
    2 BNE
    1 tag-fixnum 4 LI
    4 ds-reg 0 STW
] \ both-fixnums? define-sub-primitive

: jit-math ( insn -- )
    3 ds-reg 0 LWZ
    4 ds-reg -4 LWZU
    [ 5 3 4 ] dip execute( dst src1 src2 -- )
    5 ds-reg 0 STW ;

[ \ ADD jit-math ] \ fixnum+fast define-sub-primitive

[ \ SUBF jit-math ] \ fixnum-fast define-sub-primitive

[
    3 ds-reg 0 LWZ
    4 ds-reg -4 LWZU
    4 4 tag-bits get SRAWI
    5 3 4 MULLW
    5 ds-reg 0 STW
] \ fixnum*fast define-sub-primitive

[ \ AND jit-math ] \ fixnum-bitand define-sub-primitive

[ \ OR jit-math ] \ fixnum-bitor define-sub-primitive

[ \ XOR jit-math ] \ fixnum-bitxor define-sub-primitive

[
    3 ds-reg 0 LWZ
    3 3 NOT
    3 3 tag-mask get XORI
    3 ds-reg 0 STW
] \ fixnum-bitnot define-sub-primitive

[
    3 ds-reg 0 LWZ
    3 3 tag-bits get SRAWI
    ds-reg ds-reg 4 SUBI
    4 ds-reg 0 LWZ
    5 4 3 SLW
    6 3 NEG
    7 4 6 SRAW
    7 7 0 0 31 tag-bits get - RLWINM
    0 3 0 CMPI
    2 BGT
    5 7 MR
    5 ds-reg 0 STW
] \ fixnum-shift-fast define-sub-primitive

[
    3 ds-reg 0 LWZ
    ds-reg ds-reg 4 SUBI
    4 ds-reg 0 LWZ
    5 4 3 DIVW
    6 5 3 MULLW
    7 6 4 SUBF
    7 ds-reg 0 STW
] \ fixnum-mod define-sub-primitive

[
    3 ds-reg 0 LWZ
    ds-reg ds-reg 4 SUBI
    4 ds-reg 0 LWZ
    5 4 3 DIVW
    5 5 tag-bits get SLWI
    5 ds-reg 0 STW
] \ fixnum/i-fast define-sub-primitive

[
    3 ds-reg 0 LWZ
    4 ds-reg -4 LWZ
    5 4 3 DIVW
    6 5 3 MULLW
    7 6 4 SUBF
    5 5 tag-bits get SLWI
    5 ds-reg -4 STW
    7 ds-reg 0 STW
] \ fixnum/mod-fast define-sub-primitive

[
    3 ds-reg 0 LWZ
    3 3 1 SRAWI
    rs-reg 3 3 LWZX
    3 ds-reg 0 STW
] \ get-local define-sub-primitive

[
    3 ds-reg 0 LWZ
    ds-reg ds-reg 4 SUBI
    3 3 1 SRAWI
    rs-reg 3 rs-reg SUBF
] \ drop-locals define-sub-primitive

[ "bootstrap.ppc" forget-vocab ] with-compilation-unit