ed917c394f
Along with the mypy tool, this helps find bugs in the Python code handling the instruction definition data structures.
119 lines
3.0 KiB
Python
119 lines
3.0 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 .base import iadd, iadd_cout, iadd_cin, iadd_carry
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from .base import isub, isub_bin, isub_bout, isub_borrow
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from .base import bor, isplit_lohi, iconcat_lohi
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from .base import icmp
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from .ast import Var
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from .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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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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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_lohi(x),
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(yl, yh) << isplit_lohi(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_lohi(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_lohi(x),
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(yl, yh) << isplit_lohi(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_lohi(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('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('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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a << iadd(a1, c)
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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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a << isub(a1, b)
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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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(a, c2) << iadd_cout(a1, c_in),
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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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(a, b2) << isub_bout(a1, b_in),
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c << bor(b1, b2)
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))
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