Fixing PowerPC backend: prolog register clobberage, spilling, and general stack frame usage. Add some lame tests for spilling

db4
sheeple 2008-11-06 19:00:56 -06:00
parent b7dc7296db
commit d1f248dac6
4 changed files with 414 additions and 222 deletions

View File

@ -1,8 +1,8 @@
! Copyright (C) 2008 Slava Pestov.
! See http://factorcode.org/license.txt for BSD license.
USING: namespaces accessors math.order assocs kernel sequences
combinators make cpu.architecture compiler.cfg.instructions
compiler.cfg.registers ;
combinators make classes words cpu.architecture
compiler.cfg.instructions compiler.cfg.registers ;
IN: compiler.cfg.stack-frame
SYMBOL: frame-required?
@ -24,16 +24,16 @@ M: ##stack-frame compute-stack-frame*
M: ##call compute-stack-frame*
word>> sub-primitive>> [ frame-required? on ] unless ;
M: _gc compute-stack-frame*
drop frame-required? on ;
M: _spill compute-stack-frame*
drop frame-required? on ;
M: _spill-counts compute-stack-frame*
counts>> stack-frame get (>>spill-counts) ;
M: insn compute-stack-frame* drop ;
M: insn compute-stack-frame*
class frame-required? word-prop [
frame-required? on
] when ;
\ _gc t frame-required? set-word-prop
\ _spill t frame-required? set-word-prop
: compute-stack-frame ( insns -- )
frame-required? off

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@ -0,0 +1,343 @@
USING: math.private kernel combinators accessors arrays
generalizations float-arrays tools.test ;
IN: compiler.tests
: float-spill-bug ( a -- b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b )
{
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
} cleave ;
[ 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 ]
[ 1.0 float-spill-bug ] unit-test
[ t ] [ \ float-spill-bug compiled>> ] unit-test
: float-fixnum-spill-bug ( object -- object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object )
{
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
} cleave ;
[ 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 ]
[ 1.0 float-fixnum-spill-bug ] unit-test
[ t ] [ \ float-fixnum-spill-bug compiled>> ] unit-test
: resolve-spill-bug ( a b -- c )
[ 1 fixnum+fast ] bi@ dup 10 fixnum< [
nip 2 fixnum+fast
] [
drop {
[ dup fixnum+fast ]
[ dup fixnum+fast ]
[ dup fixnum+fast ]
[ dup fixnum+fast ]
[ dup fixnum+fast ]
[ dup fixnum+fast ]
[ dup fixnum+fast ]
[ dup fixnum+fast ]
[ dup fixnum+fast ]
[ dup fixnum+fast ]
[ dup fixnum+fast ]
[ dup fixnum+fast ]
[ dup fixnum+fast ]
[ dup fixnum+fast ]
[ dup fixnum+fast ]
[ dup fixnum+fast ]
} cleave
16 narray
] if ;
[ t ] [ \ resolve-spill-bug compiled>> ] unit-test
[ 4 ] [ 1 1 resolve-spill-bug ] unit-test
! The above don't really test spilling...
: spill-test-1 ( a -- b )
dup 1 fixnum+fast
dup 1 fixnum+fast
dup 1 fixnum+fast
dup 1 fixnum+fast
dup 1 fixnum+fast
dup 1 fixnum+fast
dup 1 fixnum+fast
dup 1 fixnum+fast
dup 1 fixnum+fast
dup 1 fixnum+fast
dup 1 fixnum+fast
dup 1 fixnum+fast
dup 1 fixnum+fast
dup 1 fixnum+fast
dup 1 fixnum+fast
dup 1 fixnum+fast
dup 1 fixnum+fast
dup 1 fixnum+fast
dup 1 fixnum+fast
dup 1 fixnum+fast
dup 1 fixnum+fast
dup 1 fixnum+fast
dup 1 fixnum+fast
dup 1 fixnum+fast
dup 1 fixnum+fast
dup 1 fixnum+fast
dup 1 fixnum+fast
dup 1 fixnum+fast
dup 1 fixnum+fast fixnum>float
3array
3array [ 8 narray ] dip 2array
[ 8 narray [ 8 narray ] dip 2array ] dip 2array
2array ;
[
{
1
{
{ { 2 3 4 5 6 7 8 9 } { 10 11 12 13 14 15 16 17 } }
{
{ 18 19 20 21 22 23 24 25 }
{ 26 27 { 28 29 30.0 } }
}
}
}
] [ 1 spill-test-1 ] unit-test
: spill-test-2 ( a -- b )
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
dup 1.0 float+
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float*
float* ;
[ t ] [ 1.0 spill-test-2 1.0 \ spill-test-2 def>> call = ] unit-test

View File

@ -3,7 +3,7 @@ kernel.private math hashtables.private math.private namespaces
sequences sequences.private tools.test namespaces.private
slots.private sequences.private byte-arrays alien
alien.accessors layouts words definitions compiler.units io
combinators vectors ;
combinators vectors float-arrays ;
IN: compiler.tests
! Originally, this file did black box testing of templating
@ -206,167 +206,6 @@ TUPLE: my-tuple ;
] compile-call
] unit-test
: float-spill-bug ( a -- b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b )
{
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
[ dup float+ ]
} cleave ;
[ 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 ]
[ 1.0 float-spill-bug ] unit-test
[ t ] [ \ float-spill-bug compiled>> ] unit-test
: float-fixnum-spill-bug ( object -- object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object object )
{
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
[ dup float+ ]
[ float>fixnum dup fixnum+fast ]
} cleave ;
[ 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 2.0 2 ]
[ 1.0 float-fixnum-spill-bug ] unit-test
[ t ] [ \ float-fixnum-spill-bug compiled>> ] unit-test
: resolve-spill-bug ( a b -- c )
[ 1 fixnum+fast ] bi@ dup 10 fixnum< [
nip 2 fixnum+fast
] [
drop {
[ dup fixnum+fast ]
[ dup fixnum+fast ]
[ dup fixnum+fast ]
[ dup fixnum+fast ]
[ dup fixnum+fast ]
[ dup fixnum+fast ]
[ dup fixnum+fast ]
[ dup fixnum+fast ]
[ dup fixnum+fast ]
[ dup fixnum+fast ]
[ dup fixnum+fast ]
[ dup fixnum+fast ]
[ dup fixnum+fast ]
[ dup fixnum+fast ]
[ dup fixnum+fast ]
[ dup fixnum+fast ]
} cleave
16 narray
] if ;
[ t ] [ \ resolve-spill-bug compiled>> ] unit-test
[ 4 ] [ 1 1 resolve-spill-bug ] unit-test
! Regression
: dispatch-alignment-regression ( -- c )
{ tuple vector } 3 slot { word } declare

View File

@ -4,7 +4,8 @@ USING: accessors assocs sequences kernel combinators make math
math.order math.ranges system namespaces locals layouts words
alien alien.c-types cpu.architecture cpu.ppc.assembler
compiler.cfg.registers compiler.cfg.instructions
compiler.constants compiler.codegen compiler.codegen.fixup ;
compiler.constants compiler.codegen compiler.codegen.fixup
compiler.cfg.intrinsics compiler.cfg.stack-frame ;
IN: cpu.ppc
! PowerPC register assignments:
@ -25,17 +26,21 @@ IN: cpu.ppc
t "longlong" c-type (>>stack-align?)
t "ulonglong" c-type (>>stack-align?)
] }
} cond >>
} cond
enable-float-intrinsics
\ ##integer>float t frame-required? set-word-prop
\ ##float>integer t frame-required? set-word-prop >>
M: ppc machine-registers
{
{ int-regs T{ range f 2 26 1 } }
{ double-float-regs T{ range f 0 28 1 } }
{ double-float-regs T{ range f 0 29 1 } }
} ;
: scratch-reg 28 ; inline
: fp-scratch-reg-1 29 ; inline
: fp-scratch-reg-2 30 ; inline
: fp-scratch-reg 30 ; inline
M: ppc two-operand? f ;
@ -71,12 +76,15 @@ M: ppc %inc-r ( n -- ) rs-reg (%inc) ;
{ macosx [ 6 ] }
} case cells ; foldable
: lr-save ( -- n )
os {
{ linux [ 1 ] }
{ macosx [ 2 ] }
} case cells ; foldable
! The start of the stack frame contains the size of this frame
! as well as the currently executing XT
: factor-area-size ( -- n ) 2 cells ; foldable
: next-save ( n -- i ) cell - ;
: xt-save ( n -- i ) 2 cells - ;
! Next, we have the spill area as well as the FFI parameter area.
! They overlap, since basic blocks with FFI calls will never
! spill.
: param@ ( n -- x ) reserved-area-size + ; inline
: param-save-size ( -- n ) 8 cells ; foldable
@ -84,19 +92,38 @@ M: ppc %inc-r ( n -- ) rs-reg (%inc) ;
: local@ ( n -- x )
reserved-area-size param-save-size + + ; inline
: factor-area-size ( -- n ) 2 cells ; foldable
: spill-integer-base ( -- n )
stack-frame get spill-counts>> double-float-regs swap at
double-float-regs reg-size * ;
: next-save ( n -- i ) cell - ;
: spill-integer@ ( n -- offset )
cells spill-integer-base + param@ ;
: xt-save ( n -- i ) 2 cells - ;
: spill-float@ ( n -- offset )
double-float-regs reg-size * param@ ;
! Some FP intrinsics need a temporary scratch area in the stack
! frame, 8 bytes in size
: scratch@ ( n -- offset )
stack-frame get total-size>>
factor-area-size -
param-save-size -
+ ;
! Finally we have the linkage area
: lr-save ( -- n )
os {
{ linux [ 1 ] }
{ macosx [ 2 ] }
} case cells ; foldable
M: ppc stack-frame-size ( stack-frame -- i )
[ spill-counts>> [ swap reg-size * ] { } assoc>map sum ]
[ params>> ]
[ return>> ]
tri + +
reserved-area-size +
param-save-size +
reserved-area-size +
factor-area-size +
4 cells align ;
@ -219,19 +246,19 @@ M: ppc %div-float FDIV ;
M:: ppc %integer>float ( dst src -- )
HEX: 4330 scratch-reg LIS
scratch-reg 1 0 param@ STW
scratch-reg 1 0 scratch@ STW
scratch-reg src MR
scratch-reg dup HEX: 8000 XORIS
scratch-reg 1 cell param@ STW
fp-scratch-reg-2 1 0 param@ LFD
scratch-reg 1 4 scratch@ STW
dst 1 0 scratch@ LFD
scratch-reg 4503601774854144.0 %load-indirect
fp-scratch-reg-2 scratch-reg float-offset LFD
fp-scratch-reg-2 fp-scratch-reg-2 fp-scratch-reg-2 FSUB ;
fp-scratch-reg scratch-reg float-offset LFD
dst dst fp-scratch-reg FSUB ;
M:: ppc %float>integer ( dst src -- )
fp-scratch-reg-1 src FCTIWZ
fp-scratch-reg-2 1 0 param@ STFD
dst 1 4 param@ LWZ ;
fp-scratch-reg src FCTIWZ
fp-scratch-reg 1 0 scratch@ STFD
dst 1 4 scratch@ LWZ ;
M: ppc %copy ( dst src -- ) MR ;
@ -239,6 +266,10 @@ M: ppc %copy-float ( dst src -- ) FMR ;
M: ppc %unbox-float ( dst src -- ) float-offset LFD ;
M:: ppc %box-float ( dst src temp -- )
dst 16 float temp %allot
src dst float-offset STFD ;
M:: ppc %unbox-any-c-ptr ( dst src temp -- )
[
{ "is-byte-array" "end" "start" } [ define-label ] each
@ -370,12 +401,12 @@ M: ppc %gc
"end" resolve-label ;
M: ppc %prologue ( n -- )
0 scratch-reg LOAD32 rc-absolute-ppc-2/2 rel-this
0 11 LOAD32 rc-absolute-ppc-2/2 rel-this
0 MFLR
1 1 pick neg ADDI
scratch-reg 1 pick xt-save STW
dup scratch-reg LI
scratch-reg 1 pick next-save STW
11 1 pick xt-save STW
dup 11 LI
11 1 pick next-save STW
0 1 rot lr-save + STW ;
M: ppc %epilogue ( n -- )
@ -426,32 +457,11 @@ M: ppc %compare-branch (%compare) %branch ;
M: ppc %compare-imm-branch (%compare-imm) %branch ;
M: ppc %compare-float-branch (%compare-float) %branch ;
: spill-integer-base ( stack-frame -- n )
[ params>> ] [ return>> ] bi + ;
M: ppc %spill-integer ( src n -- ) spill-integer@ 1 swap STW ;
M: ppc %reload-integer ( dst n -- ) spill-integer@ 1 swap LWZ ;
: stack@ 1 swap ; inline
: spill-integer@ ( n -- reg offset )
cells
stack-frame get spill-integer-base
+ stack@ ;
: spill-float-base ( stack-frame -- n )
[ spill-counts>> int-regs swap at int-regs reg-size * ]
[ params>> ]
[ return>> ]
tri + + ;
: spill-float@ ( n -- reg offset )
double-float-regs reg-size *
stack-frame get spill-float-base
+ stack@ ;
M: ppc %spill-integer ( src n -- ) spill-integer@ STW ;
M: ppc %reload-integer ( dst n -- ) spill-integer@ LWZ ;
M: ppc %spill-float ( src n -- ) spill-float@ STFD ;
M: ppc %reload-float ( dst n -- ) spill-float@ LFD ;
M: ppc %spill-float ( src n -- ) spill-float@ 1 swap STFD ;
M: ppc %reload-float ( dst n -- ) spill-float@ 1 swap LFD ;
M: ppc %loop-entry ;