2.7.0版本中引入的。alignof是一个GCC编译器扩展,用于获取给定类型的对齐要求。它返回一个整数值,表示该类型在内存中的对齐边界。 alignof的语法如下: 代码语言:txt 复制 __alignof__(type) 其中,type是要查询对齐要求的类型。 alignof的分类:alignof主要用于查询类型的对齐要求,它可以用于任何类型,包括基本类型、结...
可以看出,在 std::__aligned_storage_msa 的实现中,__attribute__((__aligned__)) 后面是没有参数的,此时gcc即会根据平台生成默认内存对齐大小。 int main(int argc, char const *argv[]) { std::cout << alignof(std::__aligned_storage_msa<sizeof(1)>::__type) << std::endl; std::cout <...
}///* * Note: if you try to tail-call these helper routines, gcc will * unfortunately still generate functions with frames and and makes a * call instead of a jump. It's because of std::pair (and is still * the case if you return a custom struct). * * For now we're leaving...
uint32Alignment>structTAlignedBytes;// this intentionally won't compile, we don't support the requested alignment/** Unaligned storage. */template<int32Size>structTAlignedBytes<Size,1>{uint8Pad[Size];};#define GCC_ALIGN(_align)#define MS_ALIGN(n) __declspec(align(n))// C++/CLI doesn't...
2014-03-09 20:01 −注:本文代码测试环境为win7 X64 cpu, 编译器为gcc4.7.1 和 vs2010 内存对齐是编译器为了便于CPU快速访问而采用的一项技术 我们先从一个例子开始,对下面的类(或者结构体) class node { char c; int i; short s; }no... ...
int b=sizeof(str); /*b=20;sizeof 计算的则是分配的数组str[20] 所占的内存空间的大小，不...
ctype = ffi.typeof("struct s1")# verify the information with gccffi1 = FFI() ffi1.cdef(""" static const int Gofs_y, Galign, Gsize; struct s1 *try_with_value(int fieldnum, long long value); """) fnames = [nameforname, cfieldinctype.fieldsifnameandcfield.bitsize >0] ...
gcc/c-family/ * c-common.cc (c_sizeof_or_alignof_type): Allow alignof on an incomplete array type for C2Y. gcc/testsuite/ * gcc.dg/c23-align-10.c, gcc.dg/c2y-align-1.c, gcc.dg/c2y-align-2.c: New tests. diff --git a/gcc/c-family/c-common.cc b/gcc/c-family/c-commo...
nstester pushed a commit to nstester/gcc that referenced this pull request Jun 9, 2021 d: Respect explicit align(N) type alignment (PR100935) … 04fea2d Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment Reviewers MoonlightSentinel ...
MySQL. Note that the contributor of that patch is one of the maintainers of the HPPA GCC port, so with the above analysis, I'm reasonably sure that we need to just #ifdef this for HPPA for the time being until C++17. I'll try running the test suite on 3.17 (which builds for me...