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import pytest
import sympy as sp
import pystencils
from pystencils.math_optimizations import HAS_REWRITING, optimize_assignments, optims_pystencils_cpu
@pytest.mark.skipif(not HAS_REWRITING, reason="need sympy.codegen.rewriting")
def test_sympy_optimizations():
for target in ('cpu', 'gpu'):
x, y, z = pystencils.fields('x, y, z: float32[2d]')
# Triggers Sympy's expm1 optimization
assignments = pystencils.AssignmentCollection({
x[0, 0]: sp.exp(y[0, 0]) - 1
})
assignments = optimize_assignments(assignments, optims_pystencils_cpu)
ast = pystencils.create_kernel(assignments, target=target)
code = str(pystencils.show_code(ast))
assert 'expm1(' in code
@pytest.mark.skipif(not HAS_REWRITING, reason="need sympy.codegen.rewriting")
def test_evaluate_constant_terms():
for target in ('cpu', 'gpu'):
x, y, z = pystencils.fields('x, y, z: float32[2d]')
# Triggers Sympy's expm1 optimization
assignments = pystencils.AssignmentCollection({
x[0, 0]: -sp.cos(1) + y[0, 0]
})
assignments = optimize_assignments(assignments, optims_pystencils_cpu)
ast = pystencils.create_kernel(assignments, target=target)
code = str(pystencils.show_code(ast))
assert 'cos(' not in code
print(code)
@pytest.mark.skipif(not HAS_REWRITING, reason="need sympy.codegen.rewriting")
def test_do_not_evaluate_constant_terms():
optimizations = pystencils.math_optimizations.optims_pystencils_cpu
optimizations.remove(pystencils.math_optimizations.evaluate_constant_terms)
for target in ('cpu', 'gpu'):
x, y, z = pystencils.fields('x, y, z: float32[2d]')
assignments = pystencils.AssignmentCollection({
x[0, 0]: -sp.cos(1) + y[0, 0]
})
optimize_assignments(assignments, optimizations)
ast = pystencils.create_kernel(assignments, target=target)
code = str(pystencils.show_code(ast))
assert 'cos(' in code
print(code)