113 lines
3.5 KiB
Python
113 lines
3.5 KiB
Python
import unittest
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import sys
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import math
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from llvm.core import (Module, Type, Function, Builder, Constant)
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import llvm.core as lc
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import llvm.ee as le
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from .support import TestCase, tests, BITS
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class TestIntrinsic(TestCase):
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def test_bswap(self):
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# setup a function and a builder
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mod = Module.new('test')
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functy = Type.function(Type.int(), [])
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func = mod.add_function(functy, "showme")
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block = func.append_basic_block("entry")
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b = Builder.new(block)
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# let's do bswap on a 32-bit integer using llvm.bswap
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val = Constant.int(Type.int(), 0x42)
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bswap = Function.intrinsic(mod, lc.INTR_BSWAP, [Type.int()])
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bswap_res = b.call(bswap, [val])
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b.ret(bswap_res)
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# logging.debug(mod)
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# the output is:
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#
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# ; ModuleID = 'test'
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#
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# define void @showme() {
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# entry:
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# %0 = call i32 @llvm.bswap.i32(i32 42)
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# ret i32 %0
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# }
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# let's run the function
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ee = le.ExecutionEngine.new(mod)
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retval = ee.run_function(func, [])
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self.assertEqual(retval.as_int(), 0x42000000)
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def test_mysin(self):
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if sys.platform == 'win32' and BITS == 32:
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# float32 support is known to fail on 32-bit Windows
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return
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# mysin(x) = sqrt(1.0 - pow(cos(x), 2))
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mod = Module.new('test')
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float = Type.float()
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mysinty = Type.function( float, [float] )
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mysin = mod.add_function(mysinty, "mysin")
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block = mysin.append_basic_block("entry")
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b = Builder.new(block)
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sqrt = Function.intrinsic(mod, lc.INTR_SQRT, [float])
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pow = Function.intrinsic(mod, lc.INTR_POWI, [float])
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cos = Function.intrinsic(mod, lc.INTR_COS, [float])
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mysin.args[0].name = "x"
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x = mysin.args[0]
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one = Constant.real(float, "1")
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cosx = b.call(cos, [x], "cosx")
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cos2 = b.call(pow, [cosx, Constant.int(Type.int(), 2)], "cos2")
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onemc2 = b.fsub(one, cos2, "onemc2") # Should use fsub
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sin = b.call(sqrt, [onemc2], "sin")
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b.ret(sin)
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#logging.debug(mod)
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# ; ModuleID = 'test'
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#
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# define void @showme() {
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# entry:
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# call i32 @llvm.bswap.i32( i32 42 ) ; <i32>:0 [#uses
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# }
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#
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# declare i32 @llvm.bswap.i32(i32) nounwind readnone
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#
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# define float @mysin(float %x) {
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# entry:
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# %cosx = call float @llvm.cos.f32( float %x ) ; <float
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# %cos2 = call float @llvm.powi.f32( float %cosx, i32 2 )
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# %onemc2 = sub float 1.000000e+00, %cos2 ; <float> [#uses
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# %sin = call float @llvm.sqrt.f32( float %onemc2 )
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# ret float %sin
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# }
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#
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# declare float @llvm.sqrt.f32(float) nounwind readnone
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#
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# declare float @llvm.powi.f32(float, i32) nounwind readnone
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#
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# declare float @llvm.cos.f32(float) nounwind readnone
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# let's run the function
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from llvm.workaround.avx_support import detect_avx_support
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if not detect_avx_support():
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ee = le.EngineBuilder.new(mod).mattrs("-avx").create()
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else:
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ee = le.EngineBuilder.new(mod).create()
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arg = le.GenericValue.real(Type.float(), 1.234)
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retval = ee.run_function(mysin, [arg])
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golden = math.sin(1.234)
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answer = retval.as_real(Type.float())
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self.assertTrue(abs(answer-golden)/golden < 1e-5)
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tests.append(TestIntrinsic)
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if __name__ == '__main__':
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unittest.main()
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