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[smlnj] Annotation of /sml/trunk/src/MLRISC/sparc/instructions/sparcPeephole.sml
Annotation of /sml/trunk/src/MLRISC/sparc/instructions/sparcPeephole.sml
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(* WARNING: this is generated by running 'wheregen sparcPeephole.peep'.
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* Do not edit this file directly.
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*)
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(*#line 7.1 "sparcPeephole.peep"*)
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functor SparcPeephole(SparcInstr : SPARCINSTR): PEEPHOLE =
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struct
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(*#line 9.4 "sparcPeephole.peep"*)
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structure I = SparcInstr
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(*#line 10.4 "sparcPeephole.peep"*)
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structure C = I.C
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(*#line 13.4 "sparcPeephole.peep"*)
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fun peephole instrs =
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let
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(*#line 14.8 "sparcPeephole.peep"*)
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fun isZero (I.LAB le) = (I.LabelExp.valueOf le) = 0
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| isZero (I.REG r) = (C.registerNum r) = 0
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| isZero (I.IMMED i) = i = 0
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| isZero _ = false
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(*#line 19.8 "sparcPeephole.peep"*)
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fun removable (I.ARITH{a=(I.ADD | I.SUB), r, i, d}) = (C.sameColor (r,
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d)) andalso (isZero i)
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| removable (I.ANNOTATION{i, a}) = removable i
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| removable _ = false
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(*#line 24.8 "sparcPeephole.peep"*)
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fun loop (current, instrs) =
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let val v_3 = current
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in
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(case v_3 of
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nil => instrs
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| op :: v_2 =>
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let val (v_0, v_1) = v_2
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in
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let val i = v_0
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and rest = v_1
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in (if (removable i)
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then (loop (rest, instrs))
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else
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let val i = v_0
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and rest = v_1
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in loop (rest, i :: instrs)
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end)
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end
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end
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)
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end
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in loop (instrs, [])
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end
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end
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