f2ebabaf5f
The code to compute the address of a global variable depends on the kind of variable, so custom legalization is required. - Add a legalizer::globalvar module which exposes an expand_global_addr() function. This module is likely to grow as we add more types of global variables. - Add a ArgumentPurpose::VMContext enumerator. This is used to represent special 'vmctx' arguments that are used as base pointers for vmctx globals.
194 lines
5.1 KiB
Python
194 lines
5.1 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 . import instructions as insts
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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 bnot, band_not, bor_not, bxor_not
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from .instructions import icmp, icmp_imm
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from .instructions import iconst, bint
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from .instructions import ishl, ishl_imm, sshr, sshr_imm, ushr, ushr_imm
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from .instructions import rotl, rotl_imm, rotr, rotr_imm
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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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widen = XFormGroup('widen', """
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Legalize instructions by widening.
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The transformations in the 'widen' group work by expressing
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instructions in terms of larger 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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# Custom expansions for memory objects.
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expand.custom_legalize(insts.global_addr, 'expand_global_addr')
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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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cc = Var('cc')
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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 immediate operands that are out of range.
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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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# Rotates and shifts.
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for inst_imm, inst in [
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(rotl_imm, rotl),
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(rotr_imm, rotr),
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(ishl_imm, ishl),
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(sshr_imm, sshr),
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(ushr_imm, ushr)]:
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expand.legalize(
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a << inst_imm(x, y),
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Rtl(
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a1 << iconst.i32(y),
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a << inst(x, a1)
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))
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expand.legalize(
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a << icmp_imm(cc, x, y),
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Rtl(
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a1 << iconst(y),
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a << icmp(cc, x, a1)
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))
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# Expansions for *_not variants of bitwise ops.
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for inst_not, inst in [
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(band_not, band),
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(bor_not, bor),
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(bxor_not, bxor)]:
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expand.legalize(
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a << inst_not(x, y),
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Rtl(
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a1 << bnot(y),
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a << inst(x, a1)
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))
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