48 lines
1.7 KiB
Factor
48 lines
1.7 KiB
Factor
! Copyright (C) 2009 Slava Pestov.
|
|
! See http://factorcode.org/license.txt for BSD license.
|
|
USING: accessors assocs combinators combinators.short-circuit
|
|
kernel math namespaces sequences locals compiler.cfg.def-use
|
|
compiler.cfg.dominance compiler.cfg.ssa.interference.live-ranges ;
|
|
IN: compiler.cfg.ssa.interference
|
|
|
|
<PRIVATE
|
|
|
|
:: kill-after-def? ( vreg1 vreg2 bb -- ? )
|
|
! If first register is used after second one is defined, they interfere.
|
|
! If they are used in the same instruction, no interference. If the
|
|
! instruction is a def-is-use-insn, then there will be a use at +1
|
|
! (instructions are 2 apart) and so outputs will interfere with
|
|
! inputs.
|
|
vreg1 bb kill-index
|
|
vreg2 bb def-index > ;
|
|
|
|
:: interferes-same-block? ( vreg1 vreg2 bb1 bb2 -- ? )
|
|
! If both are defined in the same basic block, they interfere if their
|
|
! local live ranges intersect.
|
|
vreg1 bb1 def-index
|
|
vreg2 bb1 def-index <
|
|
[ vreg1 vreg2 ] [ vreg2 vreg1 ] if
|
|
bb1 kill-after-def? ;
|
|
|
|
: interferes-first-dominates? ( vreg1 vreg2 bb1 bb2 -- ? )
|
|
! If vreg1 dominates vreg2, then they interfere if vreg2's definition
|
|
! occurs before vreg1 is killed.
|
|
nip
|
|
kill-after-def? ;
|
|
|
|
: interferes-second-dominates? ( vreg1 vreg2 bb1 bb2 -- ? )
|
|
! If vreg2 dominates vreg1, then they interfere if vreg1's definition
|
|
! occurs before vreg2 is killed.
|
|
drop
|
|
swapd kill-after-def? ;
|
|
|
|
PRIVATE>
|
|
|
|
: interferes? ( vreg1 vreg2 -- ? )
|
|
2dup [ def-of ] bi@ {
|
|
{ [ 2dup eq? ] [ interferes-same-block? ] }
|
|
{ [ 2dup dominates? ] [ interferes-first-dominates? ] }
|
|
{ [ 2dup swap dominates? ] [ interferes-second-dominates? ] }
|
|
[ 2drop 2drop f ]
|
|
} cond ;
|