simd_find_8x64
block->newline = simd_find_8x64(&block->input, '\n');
block->backslash = simd_find_8x64(&block->input, '\\');
block->quoted = simd_find_8x64(&block->input, '"') & ~block->escaped;
block->semicolon = simd_find_8x64(&block->input, ';') & ~block->escaped;