在Rust与C语言中，针对u128、i128数据类型在x86-32和x86-64架构上的对齐方式，长期以来存在不一致。这种不一致来自于两个实例的对齐要求不同，在C语言中，__int128（相当于Rust的u128、i128）的对齐要求遵循该平台应用程序二进制界面（ABI）的规范，代表着在x86-64系统上，__int128的对齐可能被要求为16字节，目...
Prints8. While the following C program: #include<stdio.h>structfoo{unsigned__int128t; };intmain() {printf("Align: %ld\n", _Alignof(structfoo)); } Prints16on the same system. This is pretty unexpected, and means that i128 / u128 are not really usable for FFI / alignment purposes....
Rust缺少C语言中的int、long、unsigned和其他具有实现定义大小的类型。相反,Rust的原生整数类型是精确大小的类型:i8、i16、i32、i64和i128分别是8、16、32、64和128位的有符号整数,而u8、u16、u32、u64和u128是其无符号变体。Rust还提供了isize和usize,它们对应于intptr_t和uintptr_t11。对齐要求与C语言完全...
andrewrk force-pushed the fix-x86-i128-c-abi branch from 0249aa7 to 77a6031 Compare February 9, 2022 04:15 andrewrk merged commit db56d74 into master Feb 9, 2022 andrewrk deleted the fix-x86-i128-c-abi branch February 9, 2022 18:23 andrewrk added a commit that referenced this pul...
/*cout<<"__int128的最大值:"<<_I128_MAX<cout<<"__int128的最小值:"<<_I128_MIN<cout<<"unsigned __int64的最大值:"<<_UI128_MAX< return 0; } 其他的全在文件limits.h里查找吧,不再多说了,呵呵! 代码里之所以包含的是,是因为代码遵守的是C++规范!
}Imain(){Bx,r;r.h=x.l=x.h=0,r.l=1;DO(21)$((mul(&r,i),i%3),add(&x,r))sub...
i128> addrspace(1)* %ptr, ; GFX8-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0) ; GFX8-NEXT: v_add_u32_e32 v3, vcc, 16, v0 ; GFX8-NEXT: v_addc_u32_e32 v4, vcc, 0, v1, vcc -; GFX8-NEXT: flat_load_dwordx4 v[8:11], v[0:1] ...
fmt.Println(C.i128) C.ui128 = [16]byte{15: 255} fmt.Println(C.ui128) C.ptr = unsafe.Pointer(nil) fmt.Println(C.ptr) } 运行后,输出结果如下:(运行环境:Windows 7 64位操作系统,go version go1.8.3 windows/amd64) true 65 -128 255 -32768 65535 -2147483648 4294967295 -2147483648 429496...
i128toa(&b,buf) ; printf("%s\n",b uf); } Output 198070406285660 84398385987584 Support for 128 bit integers is quite new, and I haven't gotten around to add the printf/scanf support. But most functions are working now. To get lcc-win32 go to: 403 Forbidden http://www.cs.virginia...
> i128> addrspace(1)* %ptr, > ; GFX8-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0) > ; GFX8-NEXT: v_add_u32_e32 v3, vcc, 16, v0 > ; GFX8-NEXT: v_addc_u32_e32 v4, vcc, 0, v1, vcc > -; GFX8-NEXT: flat_load_dwordx4 v[8:11], v[0:1] ...