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PEP8 formatting.

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This commit is contained in:
Jakob Stoklund Olesen
2016-05-12 13:37:03 -07:00
parent 6e17d229d0
commit ea46a17f56
8 changed files with 299 additions and 232 deletions
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3
meta/constant_hash.py
View File

@@ -6,6 +6,7 @@ don't attempt parfect hashing, but simply generate an open addressed
quadratically probed hash table.
"""
def simple_hash(s):
"""
Compute a primitive hash of a string.
@@ -21,6 +22,7 @@ def simple_hash(s):
h = ((h ^ ord(c)) + ((h >> 6) + (h << 26))) & 0xffffffff
return h
def next_power_of_two(x):
"""
Compute the next power of two that is greater than `x`:
@@ -41,6 +43,7 @@ def next_power_of_two(x):
s *= 2
return x + 1
def compute_quadratic(items, hash_function):
"""
Compute an open addressed, quadratically probed hash table containing

63
meta/cretonne/__init__.py
View File

@@ -7,15 +7,20 @@ instructions.
import re
camel_re = re.compile('(^|_)([a-z])')
def camel_case(s):
"""Convert the string s to CamelCase"""
return camel_re.sub(lambda m: m.group(2).upper(), s)
# Concrete types.
#
# Instances (i8, i32, ...) are provided in the cretonne.types module.
class Type(object):
"""A concrete value type."""
@@ -27,6 +32,7 @@ class Type(object):
def __str__(self):
return self.name
class ScalarType(Type):
"""
A concrete scalar (not vector) type.
@@ -55,6 +61,7 @@ class ScalarType(Type):
self._vectors[lanes] = v
return v
class VectorType(Type):
"""
A concrete SIMD vector type.
@@ -75,7 +82,9 @@ class VectorType(Type):
self.lanes = lanes
def __repr__(self):
return 'VectorType(base={}, lanes={})'.format(self.base.name, self.lanes)
return ('VectorType(base={}, lanes={})'
.format(self.base.name, self.lanes))
class IntType(ScalarType):
"""A concrete scalar integer type."""
@@ -91,17 +100,20 @@ class IntType(ScalarType):
def __repr__(self):
return 'IntType(bits={})'.format(self.bits)
class FloatType(ScalarType):
"""A concrete scalar floating point type."""
def __init__(self, bits, doc):
assert bits > 0, 'FloatType must have positive number of bits'
super(FloatType, self).__init__( name='f{:d}'.format(bits), membytes=bits/8, doc=doc)
super(FloatType, self).__init__(name='f{:d}'.format(bits),
membytes=bits/8, doc=doc)
self.bits = bits
def __repr__(self):
return 'FloatType(bits={})'.format(self.bits)
class BoolType(ScalarType):
"""A concrete scalar boolean type."""
@@ -116,9 +128,9 @@ class BoolType(ScalarType):
def __repr__(self):
return 'BoolType(bits={})'.format(self.bits)
#
# Parametric polymorphism.
#
class TypeVar(object):
"""
@@ -132,12 +144,13 @@ class TypeVar(object):
self.name = name
self.__doc__ = doc
#
# Immediate operands.
#
# Instances of immediate operand types are provided in the cretonne.immediates
# module.
class ImmediateType(object):
"""
The type of an immediate instruction operand.
@@ -153,9 +166,9 @@ class ImmediateType(object):
def __repr__(self):
return 'ImmediateType({})'.format(self.name)
#
# Defining instructions.
#
class InstructionGroup(object):
"""
@@ -178,7 +191,8 @@ class InstructionGroup(object):
added to this group.
"""
assert InstructionGroup._current is None, (
"Can't open {} since {} is already open".format(self, _current))
"Can't open {} since {} is already open"
.format(self, InstructionGroup._current))
InstructionGroup._current = self
def close(self):
@@ -187,7 +201,8 @@ class InstructionGroup(object):
opening another instruction group.
"""
assert InstructionGroup._current is self, (
"Can't close {}, the open instuction group is {}".format(self, _current))
"Can't close {}, the open instuction group is {}"
.format(self, InstructionGroup._current))
InstructionGroup._current = None
def __init__(self, name, doc):
@@ -198,9 +213,11 @@ class InstructionGroup(object):
@staticmethod
def append(inst):
assert InstructionGroup._current, "Open an instruction group before defining instructions."
assert InstructionGroup._current, \
"Open an instruction group before defining instructions."
InstructionGroup._current.instructions.append(inst)
class Operand(object):
"""
An instruction operand.
@@ -212,12 +229,12 @@ class Operand(object):
concrete type.
2. A :py:class:`TypeVar` instance indicates an SSA value operand, and the
instruction is polymorphic over the possible concrete types that the type
variable can assume.
instruction is polymorphic over the possible concrete types that the
type variable can assume.
3. An :py:class:`ImmediateType` instance indicates an immediate operand
whose value is encoded in the instruction itself rather than being passed
as an SSA value.
whose value is encoded in the instruction itself rather than being
passed as an SSA value.
"""
def __init__(self, name, typ, doc=''):
@@ -231,19 +248,20 @@ class Operand(object):
else:
return self.typ.__doc__
class Instruction(object):
"""
An instruction.
The operands to the instruction are specified as two tuples: ``ins`` and
``outs``. Since the Python singleton tuple syntax is a bit awkward, it is
allowed to specify a singleton as just the operand itself, i.e., `ins=x` and
`ins=(x,)` are both allowed and mean the same thing.
allowed to specify a singleton as just the operand itself, i.e., `ins=x`
and `ins=(x,)` are both allowed and mean the same thing.
:param name: Instruction mnemonic, also becomes opcode name.
:param doc: Documentation string.
:param ins: Tuple of input operands. This can be a mix of SSA value operands
and immediate operands.
:param ins: Tuple of input operands. This can be a mix of SSA value
operands and immediate operands.
:param outs: Tuple of output operands. The output operands can't be
immediates.
"""
@@ -258,8 +276,8 @@ class Instruction(object):
@staticmethod
def _to_operand_tuple(x):
# Allow a single Operand instance instead of the awkward singleton tuple
# syntax.
# Allow a single Operand instance instead of the awkward singleton
# tuple syntax.
if isinstance(x, Operand):
x = (x,)
else:
@@ -268,9 +286,10 @@ class Instruction(object):
assert isinstance(op, Operand)
return x
#
# Defining targets
#
class Target(object):
"""
A target instruction set architecture.

155
meta/cretonne/base.py
View File

@@ -1,7 +1,8 @@
"""
Cretonne base instruction set.
This module defines the basic Cretonne instruction set that all targets support.
This module defines the basic Cretonne instruction set that all targets
support.
"""
from . import TypeVar, Operand, Instruction, InstructionGroup
from types import i8, f32, f64
@@ -19,17 +20,19 @@ TxN = TypeVar('%Tx%N', 'A SIMD vector type')
N = Operand('N', imm64)
a = Operand('a', Int, doc='A constant integer scalar or vector value')
iconst = Instruction('iconst', r"""
iconst = Instruction(
'iconst', r"""
Integer constant.
Create a scalar integer SSA value with an immediate constant value, or an
integer vector where all the lanes have the same value.
Create a scalar integer SSA value with an immediate constant value, or
an integer vector where all the lanes have the same value.
""",
ins=N, outs=a)
N = Operand('N', ieee32)
a = Operand('a', f32, doc='A constant integer scalar or vector value')
f32const = Instruction('f32const', r"""
f32const = Instruction(
'f32const', r"""
Floating point constant.
Create a :type:`f32` SSA value with an immediate constant value, or a
@@ -39,7 +42,8 @@ f32const = Instruction('f32const', r"""
N = Operand('N', ieee64)
a = Operand('a', f64, doc='A constant integer scalar or vector value')
f64const = Instruction('f64const', r"""
f64const = Instruction(
'f64const', r"""
Floating point constant.
Create a :type:`f64` SSA value with an immediate constant value, or a
@@ -49,7 +53,8 @@ f64const = Instruction('f64const', r"""
N = Operand('N', immvector)
a = Operand('a', TxN, doc='A constant vector value')
vconst = Instruction('vconst', r"""
vconst = Instruction(
'vconst', r"""
Vector constant (floating point or integer).
Create a SIMD vector value where the lanes don't have to be identical.
@@ -64,58 +69,65 @@ a = Operand('a', Int)
x = Operand('x', Int)
y = Operand('y', Int)
iadd = Instruction('iadd', r"""
iadd = Instruction(
'iadd', r"""
Wrapping integer addition: :math:`a := x + y \pmod{2^B}`.
This instruction does not depend on the signed/unsigned interpretation of
the operands.
This instruction does not depend on the signed/unsigned interpretation
of the operands.
""",
ins=(x, y), outs=a)
isub = Instruction('isub', r"""
isub = Instruction(
'isub', r"""
Wrapping integer subtraction: :math:`a := x - y \pmod{2^B}`.
This instruction does not depend on the signed/unsigned interpretation of
the operands.
This instruction does not depend on the signed/unsigned interpretation
of the operands.
""",
ins=(x, y), outs=a)
imul = Instruction('imul', r"""
imul = Instruction(
'imul', r"""
Wrapping integer multiplication: :math:`a := x y \pmod{2^B}`.
This instruction does not depend on the signed/unsigned interpretation of
the
This instruction does not depend on the signed/unsigned interpretation
of the
operands.
Polymorphic over all integer types (vector and scalar).
""",
ins=(x, y), outs=a)
udiv = Instruction('udiv', r"""
udiv = Instruction(
'udiv', r"""
Unsigned integer division: :math:`a := \lfloor {x \over y} \rfloor`.
This operation traps if the divisor is zero.
""",
ins=(x, y), outs=a)
sdiv = Instruction('sdiv', r"""
Signed integer division rounded toward zero: :math:`a := sign(xy) \lfloor
{|x| \over |y|}\rfloor`.
sdiv = Instruction(
'sdiv', r"""
Signed integer division rounded toward zero: :math:`a := sign(xy)
\lfloor {|x| \over |y|}\rfloor`.
This operation traps if the divisor is zero, or if the result is not
representable in :math:`B` bits two's complement. This only happens when
:math:`x = -2^{B-1}, y = -1`.
representable in :math:`B` bits two's complement. This only happens
when :math:`x = -2^{B-1}, y = -1`.
""",
ins=(x, y), outs=a)
urem = Instruction('urem', """
urem = Instruction(
'urem', """
Unsigned integer remainder.
This operation traps if the divisor is zero.
""",
ins=(x, y), outs=a)
srem = Instruction('srem', """
srem = Instruction(
'srem', """
Signed integer remainder.
This operation traps if the divisor is zero.
@@ -132,7 +144,8 @@ a = Operand('a', iB)
x = Operand('x', iB)
Y = Operand('Y', imm64)
iadd_imm = Instruction('iadd_imm', """
iadd_imm = Instruction(
'iadd_imm', """
Add immediate integer.
Same as :inst:`iadd`, but one operand is an immediate constant.
@@ -142,50 +155,57 @@ iadd_imm = Instruction('iadd_imm', """
""",
ins=(x, Y), outs=a)
imul_imm = Instruction('imul_imm', """
imul_imm = Instruction(
'imul_imm', """
Integer multiplication by immediate constant.
Polymorphic over all scalar integer types.
""",
ins=(x, Y), outs=a)
udiv_imm = Instruction('udiv_imm', """
udiv_imm = Instruction(
'udiv_imm', """
Unsigned integer division by an immediate constant.
This instruction never traps because a divisor of zero is not allowed.
""",
ins=(x, Y), outs=a)
sdiv_imm = Instruction('sdiv_imm', """
sdiv_imm = Instruction(
'sdiv_imm', """
Signed integer division by an immediate constant.
This instruction never traps because a divisor of -1 or 0 is not allowed.
""",
This instruction never traps because a divisor of -1 or 0 is not
allowed. """,
ins=(x, Y), outs=a)
urem_imm = Instruction('urem_imm', """
urem_imm = Instruction(
'urem_imm', """
Unsigned integer remainder with immediate divisor.
This instruction never traps because a divisor of zero is not allowed.
""",
ins=(x, Y), outs=a)
srem_imm = Instruction('srem_imm', """
srem_imm = Instruction(
'srem_imm', """
Signed integer remainder with immediate divisor.
This instruction never traps because a divisor of 0 or -1 is not allowed.
""",
This instruction never traps because a divisor of 0 or -1 is not
allowed. """,
ins=(x, Y), outs=a)
# Swap x and y for isub_imm.
X = Operand('X', imm64)
y = Operand('y', iB)
isub_imm = Instruction('isub_imm', """
isub_imm = Instruction(
'isub_imm', """
Immediate wrapping subtraction: :math:`a := X - y \pmod{2^B}`.
Also works as integer negation when :math:`X = 0`. Use :inst:`iadd_imm` with a
negative immediate operand for the reverse immediate subtraction.
Also works as integer negation when :math:`X = 0`. Use :inst:`iadd_imm`
with a negative immediate operand for the reverse immediate
subtraction.
Polymorphic over all scalar integer types, but does not support vector
types.
@@ -202,22 +222,26 @@ x = Operand('x', bits)
y = Operand('y', bits)
a = Operand('a', bits)
band = Instruction('band', """
band = Instruction(
'band', """
Bitwise and.
""",
ins=(x, y), outs=a)
bor = Instruction('bor', """
bor = Instruction(
'bor', """
Bitwise or.
""",
ins=(x, y), outs=a)
bxor = Instruction('bxor', """
bxor = Instruction(
'bxor', """
Bitwise xor.
""",
ins=(x, y), outs=a)
bnot = Instruction('bnot', """
bnot = Instruction(
'bnot', """
Bitwise not.
""",
ins=x, outs=a)
@@ -227,21 +251,24 @@ x = Operand('x', Int, doc='Scalar or vector value to shift')
y = Operand('y', iB, doc='Number of bits to shift')
a = Operand('a', Int)
rotl = Instruction('rotl', r"""
rotl = Instruction(
'rotl', r"""
Rotate left.
Rotate the bits in ``x`` by ``y`` places.
""",
ins=(x, y), outs=a)
rotr = Instruction('rotr', r"""
rotr = Instruction(
'rotr', r"""
Rotate right.
Rotate the bits in ``x`` by ``y`` places.
""",
ins=(x, y), outs=a)
ishl = Instruction('ishl', r"""
ishl = Instruction(
'ishl', r"""
Integer shift left. Shift the bits in ``x`` towards the MSB by ``y``
places. Shift in zero bits to the LSB.
@@ -257,9 +284,11 @@ ishl = Instruction('ishl', r"""
""",
ins=(x, y), outs=a)
ushr = Instruction('ushr', r"""
Unsigned shift right. Shift bits in ``x`` towards the LSB by ``y`` places,
shifting in zero bits to the MSB. Also called a *logical shift*.
ushr = Instruction(
'ushr', r"""
Unsigned shift right. Shift bits in ``x`` towards the LSB by ``y``
places, shifting in zero bits to the MSB. Also called a *logical
shift*.
The shift amount is masked to the size of the register.
@@ -273,9 +302,11 @@ ushr = Instruction('ushr', r"""
""",
ins=(x, y), outs=a)
sshr = Instruction('sshr', r"""
Signed shift right. Shift bits in ``x`` towards the LSB by ``y`` places,
shifting in sign bits to the MSB. Also called an *arithmetic shift*.
sshr = Instruction(
'sshr', r"""
Signed shift right. Shift bits in ``x`` towards the LSB by ``y``
places, shifting in sign bits to the MSB. Also called an *arithmetic
shift*.
The shift amount is masked to the size of the register.
@@ -290,34 +321,38 @@ sshr = Instruction('sshr', r"""
x = Operand('x', iB)
a = Operand('a', i8)
clz = Instruction('clz', r"""
clz = Instruction(
'clz', r"""
Count leading zero bits.
Starting from the MSB in ``x``, count the number of zero bits before
reaching the first one bit. When ``x`` is zero, returns the size of x in
bits.
reaching the first one bit. When ``x`` is zero, returns the size of x
in bits.
""",
ins=x, outs=a)
cls = Instruction('cls', r"""
cls = Instruction(
'cls', r"""
Count leading sign bits.
Starting from the MSB after the sign bit in ``x``, count the number of
consecutive bits identical to the sign bit. When ``x`` is 0 or -1, returns
one less than the size of x in bits.
consecutive bits identical to the sign bit. When ``x`` is 0 or -1,
returns one less than the size of x in bits.
""",
ins=x, outs=a)
ctz = Instruction('ctz', r"""
ctz = Instruction(
'ctz', r"""
Count trailing zeros.
Starting from the LSB in ``x``, count the number of zero bits before
reaching the first one bit. When ``x`` is zero, returns the size of x in
bits.
reaching the first one bit. When ``x`` is zero, returns the size of x
in bits.
""",
ins=x, outs=a)
popcnt = Instruction('popcnt', r"""
popcnt = Instruction(
'popcnt', r"""
Population count
Count the number of one bits in ``x``.

23
meta/cretonne/types.py
View File

@@ -5,7 +5,8 @@ The cretonne.types module predefines all the Cretonne scalar types.
from . import ScalarType, IntType, FloatType, BoolType
#: Boolean.
b1 = ScalarType('b1', 0,
b1 = ScalarType(
'b1', 0,
"""
A boolean value that is either true or false.
""")
@@ -21,17 +22,17 @@ i32 = IntType(32) #: 32-bit int.
i64 = IntType(64) #: 64-bit int.
#: IEEE single precision.
f32 = FloatType(32,
"""
A 32-bit floating point type represented in the IEEE 754-2008 *binary32*
interchange format. This corresponds to the :c:type:`float` type in most
C implementations.
f32 = FloatType(
32, """
A 32-bit floating point type represented in the IEEE 754-2008
*binary32* interchange format. This corresponds to the :c:type:`float`
type in most C implementations.
""")
#: IEEE double precision.
f64 = FloatType(64,
"""
A 64-bit floating point type represented in the IEEE 754-2008 *binary64*
interchange format. This corresponds to the :c:type:`double` type in
most C implementations.
f64 = FloatType(
64, """
A 64-bit floating point type represented in the IEEE 754-2008
*binary64* interchange format. This corresponds to the :c:type:`double`
type in most C implementations.
""")

10
meta/gen_instr.py
View File

@@ -5,6 +5,7 @@ Generate sources with instruction info.
import srcgen
import constant_hash
def collect_instr_groups(targets):
seen = set()
groups = []
@@ -15,6 +16,7 @@ def collect_instr_groups(targets):
seen.add(g)
return groups
def gen_opcodes(groups, out_dir):
"""Generate opcode enumerations."""
fmt = srcgen.Formatter()
@@ -46,9 +48,12 @@ def gen_opcodes(groups, out_dir):
fmt.format('Opcode::{} => "{}",', i.camel_name, i.name)
# Generate an opcode hash table for looking up opcodes by name.
hash_table = constant_hash.compute_quadratic(instrs,
hash_table = constant_hash.compute_quadratic(
instrs,
lambda i: constant_hash.simple_hash(i.name))
with fmt.indented('const OPCODE_HASH_TABLE: [Opcode; {}] = ['.format(len(hash_table)), '];'):
with fmt.indented(
'const OPCODE_HASH_TABLE: [Opcode; {}] = ['
.format(len(hash_table)), '];'):
for i in hash_table:
if i is None:
fmt.line('Opcode::NotAnOpcode,')
@@ -57,6 +62,7 @@ def gen_opcodes(groups, out_dir):
fmt.update_file('opcodes.rs', out_dir)
def generate(targets, out_dir):
groups = collect_instr_groups(targets)
gen_opcodes(groups, out_dir)

3
meta/srcgen.py
View File

@@ -9,6 +9,7 @@ source code.
import sys
import os
class Formatter(object):
"""
Source code formatter class.
@@ -70,7 +71,7 @@ class Formatter(object):
self.after = after
def __enter__(self):
self.fmt.indent_push();
self.fmt.indent_push()
def __exit__(self, t, v, tb):
self.fmt.indent_pop()

1
meta/target/__init__.py
View File

@@ -8,6 +8,7 @@ set architecture supported by Cretonne.
from . import riscv
def all_targets():
"""
Get a list of all the supported targets. Each target is represented as a

7
meta/target/riscv/__init__.py
View File

@@ -2,9 +2,10 @@
RISC-V Target
-------------
`RISC-V <http://riscv.org/>`_ is an open instruction set architecture originally
developed at UC Berkeley. It is a RISC-style ISA with either a 32-bit (RV32I) or
64-bit (RV32I) base instruction set and a number of optional extensions:
`RISC-V <http://riscv.org/>`_ is an open instruction set architecture
originally developed at UC Berkeley. It is a RISC-style ISA with either a
32-bit (RV32I) or 64-bit (RV32I) base instruction set and a number of optional
extensions:
RV32M / RV64M
Integer multiplication and division.