87 lines
2.2 KiB
Factor
87 lines
2.2 KiB
Factor
! Copyright (C) 2008 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: accessors classes kernel math namespaces combinators
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compiler.cfg.instructions compiler.cfg.value-numbering.graph ;
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IN: compiler.cfg.value-numbering.expressions
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! Referentially-transparent expressions
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TUPLE: expr op ;
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TUPLE: unary-expr < expr in ;
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TUPLE: binary-expr < expr in1 in2 ;
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TUPLE: commutative-expr < binary-expr ;
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TUPLE: compare-expr < binary-expr cc ;
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TUPLE: constant-expr < expr value ;
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: <constant> ( constant -- expr )
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f swap constant-expr boa ; inline
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M: constant-expr equal?
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over constant-expr? [
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[ [ value>> ] bi@ = ]
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[ [ value>> class ] bi@ = ] 2bi
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and
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] [ 2drop f ] if ;
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SYMBOL: input-expr-counter
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: next-input-expr ( -- n )
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input-expr-counter [ dup 1 + ] change ;
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! Expressions whose values are inputs to the basic block. We
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! can eliminate a second computation having the same 'n' as
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! the first one; we can also eliminate input-exprs whose
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! result is not used.
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TUPLE: input-expr < expr n ;
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: constant>vn ( constant -- vn ) <constant> expr>vn ; inline
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GENERIC: >expr ( insn -- expr )
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M: ##load-immediate >expr val>> <constant> ;
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M: ##unary >expr
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[ class ] [ src>> vreg>vn ] bi unary-expr boa ;
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M: ##binary >expr
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[ class ] [ src1>> vreg>vn ] [ src2>> vreg>vn ] tri
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binary-expr boa ;
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M: ##binary-imm >expr
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[ class ] [ src1>> vreg>vn ] [ src2>> constant>vn ] tri
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binary-expr boa ;
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M: ##commutative >expr
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[ class ] [ src1>> vreg>vn ] [ src2>> vreg>vn ] tri
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commutative-expr boa ;
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M: ##commutative-imm >expr
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[ class ] [ src1>> vreg>vn ] [ src2>> constant>vn ] tri
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commutative-expr boa ;
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: compare>expr ( insn -- expr )
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{
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[ class ]
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[ src1>> vreg>vn ]
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[ src2>> vreg>vn ]
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[ cc>> ]
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} cleave compare-expr boa ; inline
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M: ##compare >expr compare>expr ;
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: compare-imm>expr ( insn -- expr )
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{
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[ class ]
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[ src1>> vreg>vn ]
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[ src2>> constant>vn ]
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[ cc>> ]
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} cleave compare-expr boa ; inline
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M: ##compare-imm >expr compare-imm>expr ;
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M: ##compare-float >expr compare>expr ;
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M: ##flushable >expr class next-input-expr input-expr boa ;
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: init-expressions ( -- )
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0 input-expr-counter set ;
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