d2eb745265
The meta language patterns sometimes need to refer to specific values of enumerated immediate operands. The dot syntax provides a namespaced, typed way of doing that: icmp(intcc.ult, a, x). Add an ast.Enumerator class for representing this kind of AST leaf node. Add value definitions for the intcc and floatcc immediate operand kinds.
145 lines
3.7 KiB
Python
145 lines
3.7 KiB
Python
"""
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Patterns for legalizing the `base` instruction set.
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The base Cretonne instruction set is 'fat', and many instructions don't have
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legal representations in a given target ISA. This module defines legalization
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patterns that describe how base instructions can be transformed to other base
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instructions that are legal.
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"""
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from __future__ import absolute_import
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from .immediates import intcc
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from .instructions import iadd, iadd_cout, iadd_cin, iadd_carry, iadd_imm
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from .instructions import isub, isub_bin, isub_bout, isub_borrow
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from .instructions import band, bor, bxor, isplit, iconcat
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from .instructions import icmp, iconst, bint
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from cdsl.ast import Var
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from cdsl.xform import Rtl, XFormGroup
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narrow = XFormGroup('narrow', """
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Legalize instructions by narrowing.
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The transformations in the 'narrow' group work by expressing
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instructions in terms of smaller types. Operations on vector types are
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expressed in terms of vector types with fewer lanes, and integer
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operations are expressed in terms of smaller integer types.
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""")
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expand = XFormGroup('expand', """
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Legalize instructions by expansion.
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Rewrite instructions in terms of other instructions, generally
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operating on the same types as the original instructions.
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""")
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x = Var('x')
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y = Var('y')
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a = Var('a')
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a1 = Var('a1')
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a2 = Var('a2')
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b = Var('b')
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b1 = Var('b1')
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b2 = Var('b2')
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b_in = Var('b_in')
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b_int = Var('b_int')
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c = Var('c')
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c1 = Var('c1')
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c2 = Var('c2')
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c_in = Var('c_in')
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c_int = Var('c_int')
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xl = Var('xl')
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xh = Var('xh')
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yl = Var('yl')
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yh = Var('yh')
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al = Var('al')
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ah = Var('ah')
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narrow.legalize(
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a << iadd(x, y),
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Rtl(
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(xl, xh) << isplit(x),
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(yl, yh) << isplit(y),
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(al, c) << iadd_cout(xl, yl),
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ah << iadd_cin(xh, yh, c),
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a << iconcat(al, ah)
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))
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narrow.legalize(
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a << isub(x, y),
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Rtl(
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(xl, xh) << isplit(x),
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(yl, yh) << isplit(y),
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(al, b) << isub_bout(xl, yl),
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ah << isub_bin(xh, yh, b),
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a << iconcat(al, ah)
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))
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for bitop in [band, bor, bxor]:
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narrow.legalize(
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a << bitop(x, y),
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Rtl(
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(xl, xh) << isplit(x),
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(yl, yh) << isplit(y),
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al << bitop(xl, yl),
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ah << bitop(xh, yh),
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a << iconcat(al, ah)
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))
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# Expand integer operations with carry for RISC architectures that don't have
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# the flags.
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expand.legalize(
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(a, c) << iadd_cout(x, y),
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Rtl(
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a << iadd(x, y),
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c << icmp(intcc.ult, a, x)
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))
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expand.legalize(
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(a, b) << isub_bout(x, y),
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Rtl(
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a << isub(x, y),
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b << icmp(intcc.ugt, a, x)
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))
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expand.legalize(
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a << iadd_cin(x, y, c),
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Rtl(
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a1 << iadd(x, y),
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c_int << bint(c),
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a << iadd(a1, c_int)
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))
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expand.legalize(
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a << isub_bin(x, y, b),
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Rtl(
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a1 << isub(x, y),
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b_int << bint(b),
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a << isub(a1, b_int)
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))
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expand.legalize(
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(a, c) << iadd_carry(x, y, c_in),
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Rtl(
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(a1, c1) << iadd_cout(x, y),
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c_int << bint(c_in),
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(a, c2) << iadd_cout(a1, c_int),
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c << bor(c1, c2)
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))
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expand.legalize(
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(a, b) << isub_borrow(x, y, b_in),
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Rtl(
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(a1, b1) << isub_bout(x, y),
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b_int << bint(b_in),
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(a, b2) << isub_bout(a1, b_int),
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b << bor(b1, b2)
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))
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# Expansions for immediates that are too large.
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expand.legalize(
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a << iadd_imm(x, y),
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Rtl(
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a1 << iconst(y),
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a << iadd(x, a1)
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))
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