clang's vector extension -> ARM NEON codegen test.

gistfile1.cpp

typedef float float4 __attribute__((ext_vector_type(4)));

void
clang_test(float* out, float* in)
{
  float4 a, b;
  
  b = *((float4*)in);
  a = b * b;

  *((float4 *)out) = a;
}

// asm output

  vld1.64	{d16, d17}, [r1, :128]
	.loc	1 19 3                  @ /Users/syoyo/work/ios_dev/clangtest/clangtest/clangtest.cc:19:3
	vmul.f32	q8, q8, q8
Ltmp0:
	@DEBUG_VALUE: a <- Q8+0
	.loc	1 21 3                  @ /Users/syoyo/work/ios_dev/clangtest/clangtest/clangtest.cc:21:3
	vst1.64	{d16, d17}, [r0, :128]