factor/basis/compiler/cfg/value-numbering/rewrite/rewrite.factor

! Copyright (C) 2010 Slava Pestov.
! See http://factorcode.org/license.txt for BSD license.
USING: kernel compiler.cfg.instructions ;
IN: compiler.cfg.value-numbering.rewrite

! Outputs f to mean no change
GENERIC: rewrite ( insn -- insn/f )

M: insn rewrite drop f ;
Untagged fixnums work in progress 2010-04-21 03:08:52 -04:00			`! Copyright (C) 2010 Slava Pestov.`
Improved value numbering 2008-10-23 03:49:26 -04:00			`! See http://factorcode.org/license.txt for BSD license.`
Untagged fixnums work in progress 2010-04-21 03:08:52 -04:00			`USING: kernel compiler.cfg.instructions ;`
Improved value numbering 2008-10-23 03:49:26 -04:00			`IN: compiler.cfg.value-numbering.rewrite`

compiler.cfg.value-numbering: more optimizations 2009-07-14 17:05:25 -04:00			`! Outputs f to mean no change`
compiler.cfg.value-numbering: insert ##copy instructions for instructions whose expressions simplify. While subsequent usages are replaced with the instruction computing the simplified vreg locally, global usages may exist of the original instruction. In this case, the ##copy is not dead 2009-07-24 06:30:30 -04:00			`GENERIC: rewrite ( insn -- insn/f )`
compiler.cfg.value-numbering: more optimizations 2009-07-14 17:05:25 -04:00
compiler.cfg.value-numbering: insert ##copy instructions for instructions whose expressions simplify. While subsequent usages are replaced with the instruction computing the simplified vreg locally, global usages may exist of the original instruction. In this case, the ##copy is not dead 2009-07-24 06:30:30 -04:00			`M: insn rewrite drop f ;`