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Force gcc to treat long as a int64_t, on 32bit? The 32-bit environment sets int, long and pointer to 32 bits and generates code that runs on any i386 system. What is the conversion specifier for printf that formats a long? Add a new light switch in line with another switch? Is the EU Border Guard Agency able to tell Russian passports issued in Ukraine or Georgia from the legitimate ones? Not the answer you're looking for? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. From: Alexandre Oliva <aoliva@redhat.com> To: Geoff Keating <geoffk@geoffk.org> Cc: mark@codesourcery.com, rth@redhat.com, gcc-patches@gcc.gnu.org Subject: Re: don't assume pointer cast to unsigned long is a valid initializer Date: Mon, 03 Mar 2003 20:12:00 -0000 [thread overview] Message-ID: <orisv0w6ra.fsf@free.redhat.lsd.ic.unicamp.br> () In-Reply-To: <200303031946.h23JkI102188@desire . Thus in _Generic it will match unsigned int for clang, but not GCC. . No, what you have shown should NOT compile. Alternatively, you can turn the warning off by switching to an octal or hexadecimal literal: as per the linked table, which again, allows them to fit into the first 64-bit large unsigned type (usually unsigned long int). subroutine disagree about the number of bytes for the argument. long int, add the suffix ULL to the integer. Is it correct to say "The glue on the back of the sticker is dying down so I can not stick the sticker to the wall"? The choice is arbitrary; all that's required is that it has to be a 64-bit type. From: Richard Sandiford <rsandifo@redhat.com> To: Jason R Thorpe <thorpej@wasabisystems.com> Cc: Alexandre Oliva <aoliva@redhat.com>, Geoff Keating <geoffk@geoffk.org>, mark@codesourcery.com, rth@redhat.com, gcc-patches@gcc.gnu.org Subject: Re: don't assume pointer cast to unsigned long is a valid initializer Date: Mon, 03 Mar 2003 22:08:00 -0000 [thread overview] Message-ID: <wvn8yvwums6.fsf . enum E { A = 0xffffffffU, B . The following code is rejected by both clang and gcc but accepted by msvc: error: expected primary-expression before 'unsigned'. Multiplication is open-coded It takes a size of 32 bits. [Bug c/42544] Bad codegen with signed short cast to unsigned int, then promoted to unsigned long long. GCC considers it to be 'bit-field of type unsigned int of specified width'. Built-in Function: int __builtin_popcountll (unsigned long long) Similar to __builtin_popcount, except the argument type is unsigned long long. How does legislative oversight work in Switzerland when there is technically no "opposition" in parliament? We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. However, when the following code is compiled with the -Wall flag it gives the warning [Wimplicitly-unsigned-literal]: If I use 263-1 (9223372036854775807) instead, it compiles with no warnings (as expected - 263-1 will fit in a signed long int). By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. ISO C99 and ISO C++11 support data types for integers that are at least 64 bits wide, and as an extension GCC supports them in C90 and C++98 modes. An unsigned data type stores only positive values. Not the answer you're looking for? Better way to check if an element only exists in one array, Effect of coal and natural gas burning on particulate matter pollution. I think that concludes this issue. rev2022.12.9.43105. In C prior to C99 (but not in C++), unsuffixed decimal values that do not fit in long int are allowed to have the type unsigned long int. I didn't know that GCC makes a difference between long int and long long int even though they both are 64-bit ints. lang/gcc does not even install gcc for me. Looking for a function that can squeeze matrices. The ranges that are specified in the following table are inclusive-inclusive. Alternatively, you can turn the warning off by switching to an octal or hexadecimal literal: Is it appropriate to ignore emails from a student asking obvious questions? gcc, width of long int on different architectures. Ive been working on fixing https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78655, which basically adds an inferred range to ptr1 = ptr2 + non-zero-const such that ptr2 . Hi all, the very same code that works with XC8 fails with the XC32-gcc (V2.40). On most machines that the GNU C Library runs on, long integers are 32-bit quantities, the same size as int . Expected Behavior Compilation of examples by gcc 9,10,11 is successfuly Actual Behavior Compilation is failed by gcc 9.4.0, 10.3.0 and 11.1.0 with following errors: Non-member CircleMember Square[ 92%] Built target unified [ 96%] Buildin. @John: if your team members are writing fragile/unsafe/non-portable code then you need to fix them and/or their code. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. There may be pitfalls when you use long long types for function Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. We use template specialization for some type parameter like. Use strtoul to convert a hex string to an unsigned long: return strtoul (str, NULL, 16); Then the return value will be correct, but to display it in hex you need to use the correct type specifier: printf ("Le PC en HEX est: %lx\n", pc_hex); Also, to display it in decimal you should use the %lu specifier for an unsigned long, not %ld. As of January 15, 2018, Site fix-up work has begun! Don't assume it's true everywhere. Next: Complex, Previous: __int128, Up: C Extensions [Contents][Index]. 1. ux uy 0 signed_high_prod . Is Energy "equal" to the curvature of Space-Time? Making 'long' 4 bytes in gcc on a 64-bit Linux machine. Is it possible to generate uint64_t random numbers on GPU? Should've mentioned it in my post. Does balls to the wall mean full speed ahead or full speed ahead and nosedive? LP64 for most *nix platforms, Mac OS X, etc) is a given, so even if you could convince the compiler to use a different 64-bit model you would probably break any calls to system code, libraries, etc. The compilation difference is the CXX flag -m32 and -m64. To make an Why does GCC give a warning when setting an unsigned long to 2^64-1? fancy table from the standard (6.4.4.1p5). Would salt mines, lakes or flats be reasonably found in high, snowy elevations? An unsigned version of the long longdata type. Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_u64 on Intel CPUs, std::rbegin and std::rend function in GCC 4.9 and clang 3.5, Clang doesn't compile code but gcc and msvc compiled it, GCC disagrees with Clang and MSVC when concept that's always true is used to implement a concept. Allow non-GPL plugins in a GPL main program. Why can't I do this without a warning saying it was converted implicitly - when I declared it explicitly? Compatibility 2^32-1. On 64-bit architectures, long int, according to gcc is at least an int64_t. So unsigned long long is the same as uint64_t in the 32-bit compilation but not in 64-bit compliation? long long ( unsigned long long) If its name begins with two underscores ( __ ), a data type is non-standard. ISO C99 supports data types for integers that are at least 64 bits wide, and as an extension GCC supports them in C89 mode and in C++. Is there a higher analog of "category with all same side inverses is a groupoid"? On 32-bit, long int is at least int32_t. Why did the Council of Elrond debate hiding or sending the Ring away, if Sauron wins eventually in that scenario? unsigned long is guaranteed to be at least 32 bits. rev2022.12.9.43105. rev2022.12.9.43105. If not, you need to know whether you have 32-bit ints or 16-bit (e.g. Looks like the C FE somehow munges the uLL constant. Can virent/viret mean "green" in an adjectival sense? Technically, this does not conform to the C standard, so the compiler is warning you. unsigned long. Likewise, if the function expects long long int and you pass It is giving warning for unsigned long long int data types. Why doesn't GCC optimize a*a*a*a*a*a to (a*a*a)*(a*a*a)? expects type int for its argument, and you pass a value of type positive numbers and zero. Are the S&P 500 and Dow Jones Industrial Average securities? I assume this is a bloody newbie-question, but reading the clc-faq and . unsigned long; even if size_t is bigger than unsigned long, it will be. How do you format an unsigned long long int using printf? Does the collective noun "parliament of owls" originate in "parliament of fowls"? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. add a similar phase in the make-libstdc++ procedure. When would I give a checkpoint to my D&D party that they can return to if they die? It will really save you a lot of hassle when compiling on random-platform-with-random-compiler-47.4. In 32-bit mode, the compiler (more precisely the <stdint.h> header) defines uint64_t as unsigned long long, because unsigned long isn't wide enough. It could have defined it as unsigned long long in both modes. Are defenders behind an arrow slit attackable? Why does the distance from light to subject affect exposure (inverse square law) while from subject to lens does not? \Vijay\C> gcc -std=c99 -Wall F:\Vijay\C> a.exe ULLONG_MAX: 18446744073709551615 Enter an ull value: 18446744073709551614 Name of a play about the morality of prostitution (kind of). You can use these types in arithmetic like any other integer types. You can't assume that any of them are distinct from the predefined types. It takes a size of 64 bits. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. With Microsoft compilers, long is always an int32_t, regardless of 32/64-bit. LLONG_MIN Is this an at-all realistic configuration for a DHC-2 Beaver? Since mips pointers sign extend, we have: (unsigned long) &_text = 0xffffffff80100000L so if the value was calculated at run time, we'd have: (unsigned long) &_text - 0x10000000L - 1 = 0xffffffff700fffffL Geoff seems to be suggesting that we use R_MIPS_64 for this value, but the ELF32 R_MIPS_64 is a sign-extending 32-bit relocation, not a full . ( ( (unsigned long long) ~0ULL) << shiftby)); } gcc file.c t2.c: In function `main': t2.c:7: warning: left shift count >= width of type <IMPORTANT> Value (using hardcoded 64) : 0 Value (w/o hardcoded 64) : ffffffffffffffff </IMPORTANT> Why is the behavior different if we try to shift value by 64 bits using a variable as against direct numeric "64"? So unsigned long long is the same as uint64_t in the 32bit compliation but not in 64 bit compliation? From: Maxim Ostapenko <m.ostapenko@partner.samsung.com> To: GCC Patches <gcc-patches@gcc.gnu.org> Cc: Yury Gribov <y.gribov@samsung.com>, Slava Garbuzov <v.garbuzov@samsung.com> Subject: [Ping v4] [PATCH PR64820] Fix ASan UAR detection fails on 32-bit targets if SSP is enabled. In a function-style cast, spaces are not allowed in the type name. 3. unsigned long long merge (unsigned long long a, unsigned long long b) {// merge(12, 34) => 1234: unsigned long long shift = 10; while (shift <= b) shift *= 10; return a * shift + b;} // true if a and b can be merged in any way and the result is still a prime: bool match (unsigned long long a, unsigned long long b) {return isPrime (merge (a, b . The total number of bits in an unsigned long object is sizeof (unsigned long)*CHAR_BIT. To learn more, see our tips on writing great answers. These integer types differ in the size of the integer they can hold and the amount of storage required for them. Simply write long long int for a signed integer, or integer from 0 to 2^64-1, which is approximately 1.810^19 (18 quintillion, or 18 billion billion). Ready to optimize your JavaScript with Rust? Would salt mines, lakes or flats be reasonably found in high, snowy elevations? Thanks for contributing an answer to Stack Overflow! Basically, because your literal is decimal and doesn't have a suffix, it tries to fit into the following types: Since it won't fit into long long int, you're getting the warning you're getting. Now do your part and report any bugs or deficiencies here . The text was updated successfully, but these errors were encountered: Atomic function pointer call compiles in gcc, but not in clang and msvc. are not met. This is working perfectly with 64-bit compilation with gcc. This is the "32-Bit Language Tools Libraries" document. Why did the Council of Elrond debate hiding or sending the Ring away, if Sauron wins eventually in that scenario? Fixed-point types are supported by the DWARF debug information format. Does the collective noun "parliament of owls" originate in "parliament of fowls"? i.e. clang constexpr compile error in lambda, gcc and msvc ok. clang bug? When used in a controlling expression of #if or #elif , all signed integer constants act as if they have type std::intmax_t and all unsigned integer constants act as if they have type std::uintmax_t . Simply write long long int for a signed integer, or unsigned long long int for an unsigned integer. @NikosC. Not the answer you're looking for? The keyword unsigned is a data type specifier, which only represents non-negative integers i.e. I use boost's cstdint in all my projects. Simply write long long int for a signed integer, or unsigned long long int for an unsigned integer. The operations that are not open-coded use I don't know how to answer your question. This is why its generally much easier to use a set of typedefs that are defined per platform. On 32-bit, long int is at least int32_t. Simply write long long int for a signed integer, or unsigned long long int for an unsigned integer. Books that explain fundamental chess concepts, Effect of coal and natural gas burning on particulate matter pollution. For such types, you would need to use a C-style or C++-style cast instead, eg: std::cout << ( (unsigned long long)10); or std::cout << static_cast<unsigned long long> (10); Otherwise, use a type alias instead, eg: using ull = unsigned long long; // C++11 and later or typedef unsigned long long ull; // pre-C++11 std::cout << ull (10); Are defenders behind an arrow slit attackable? Does the collective noun "parliament of owls" originate in "parliament of fowls"? Bracers of armor Vs incorporeal touch attack. ; The maximum value that can be stored in unsigned long long int is stored as a constant in <climits> header file whose value can be used as ULLONG_MAX. Why doesn't GCC optimize a*a*a*a*a*a to (a*a*a)*(a*a*a)? Not the answer you're looking for? Is there a verb meaning depthify (getting more depth)? ; A maximum integer value that can be stored in an unsigned long long int data type is 18, 446, 744, 073, 709, 551, 615, around 2 64 - 1(but is compiler dependent). This seems simpler than figuring out a type and format specifier which reliably means "machine word sized signed int" on all . Depending on how it's used, a variable of __wchar_t designates either a wide-character type or multibyte-character type. That means you can simply call rand () and use that value. See Explicit type conversions on cppreference.com for details. You must log in or register to reply here. Ready to optimize your JavaScript with Rust? The best way to avoid such problems is to use prototypes. central limit theorem replacing radical n with n. How to connect 2 VMware instance running on same Linux host machine via emulated ethernet cable (accessible via mac address)? ' ullk ' or ' ULLK ' for unsigned long long _Accum and _Sat unsigned long long _Accum GCC support of fixed-point types as specified by the draft technical report is incomplete: Pragmas to control overflow and rounding behaviors are not implemented. Find centralized, trusted content and collaborate around the technologies you use most. -m64. How to connect 2 VMware instance running on same Linux host machine via emulated ethernet cable (accessible via mac address)? Why is this usage of "I've to work" so awkward? So every type is set at the maximum value because they are a multiple of each maximum. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Like an unsigned int, an unsignedlonglongwon't store negative numbers; it is also subject to the same overflow issuesas any integral data type. Looking for a function that can squeeze matrices. (In reply to comment #8) > stops gcc complaining on 32/64-bit opensuse 11 Might be a bit overkill, but .. in every place where the difference between two pointers is printed, I widened it to long long int and used %lld. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, I am pretty sure you have to use parentheses around the c-style cast, as in, @NikhilChatterjee I've tried parens around the whole expression and that didn't work so I thought it can't be parens, lol, @Timo You would need parenthesis around the, @RemyLebeau yeah I've read your answer, thank you :D. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. The types int32_t and uint32_t have been changed from the previous int and unsigned int to long and unsigned long respectively for the Xtensa compiler. Will an int be 32bit and a long 64bit regardless of whether the system is 32 or 64 bit? The preprocessor interpets A is of type int but A needs to be of type unsigned long int as well to avoid overflow. GCC Bugzilla - Bug 107405 [13 Regression] enum change causing Linux kernel to fail to build due to Linux . Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. unsigned int unsigned long int unsigned long long int (or the appropriate subsets for UL and UL) and the literal will fit at unsigned long int (if that's indeed the first unsigned type with no less than 64 usable bits, as it usually is). Check out this fancy table from the standard (6.4.4.1p5): which explains how integer literals are fitted into integer types. What is the difference between "long", "long long", "long int", and "long long int" in C++? ISO C99 and ISO C++11 support data types for integers that are at least GCC Bugzilla - Bug 107702 {,unsigned} __int128 to _Float16 conversion shouldn't use libgcc routines Last modified: 2022-11-16 14:30:12 UTC How does the Chameleon's Arcane/Divine focus interact with magic item crafting? Name of a play about the morality of prostitution (kind of). Did the apostolic or early church fathers acknowledge Papal infallibility? Making statements based on opinion; back them up with references or personal experience. Get a virtual cloud desktop with the Linux distro that you want in less than five minutes with Shells! In 64-bit mode, both are probably 64 bits. When would I give a checkpoint to my D&D party that they can return to if they die? On gcc and clang, some of the functionality described here requires linking against -latomic . Programming . This proposal does not try to resolve this divergence. Cooking roast potatoes with a slow cooked roast. MSVC supports "unsigned __int64" which is a 64-bit type.. Tom Nov 13 '05 # 3 Nudge Richard A. Huebner wrote: If not, what data type will yield the largest unsigned integer for me? (and %I64ufor an unsinged 64 bit integer) For most other platforms you'd use %lldfor printing a long long. Long Long - Using the GNU Compiler Collection (GCC) 5.8 Double-Word Integers ISO C99 supports data types for integers that are at least 64 bits wide, and as an extension GCC supports them in C89 mode and in C++. I'm pretty sure that on a 64 bit platform. as this invokes undefined behavior by breaking 6.5.7p4 regardless of whether a warning is generated or not. Thanks . Asking for help, clarification, or responding to other answers. From: Geoff Keating <geoffk@geoffk.org> To: Mark Mitchell <mark@codesourcery.com> Cc: Alexandre Oliva <aoliva@redhat.com>, rth@redhat.com, gcc-patches@gcc.gnu.org Subject: Re: don't assume pointer cast to unsigned long is a valid initializer Date: Sat, 01 Mar 2003 01:59:00 -0000 [thread overview] Message-ID: <jmfzq7x2xo.fsf@desire.geoffk.org> () In-Reply-To: <1046482583.4831.206.camel . at unsigned long int (if that's indeed the first unsigned type with no less than 64 usable bits, as it usually is). Long Long - Using the GNU Compiler Collection (GCC) 6.9 Double-Word Integers ISO C99 supports data types for integers that are at least 64 bits wide, and as an extension GCC supports them in C90 mode and in C++. Built-in Function: int __builtin_parityll (unsigned long long) Similar to __builtin_parity, except the argument type is unsigned long long. Defect reports The following behavior-changing defect reports were applied retroactively to previously published C++ standards. Connect and share knowledge within a single location that is structured and easy to search. rev2022.12.9.43105. The C standard states that a long int is at least 4 bytes - on my system it is 8 bytes. Not true. Both will guess the language on the basis of the file-extension, unless overridden. also make the change described above for gcc, to avoid . Why does C++ allow us to surround the variable name in parentheses when declaring a variable? Is it a gcc setting, inclusion of another header . It doesn't have ANY definition for ULLONG_MAX under the C++, while it does under C Both C and C++ do, however, have a definition for __UINT64_MAX__ , so I used it to define ULLONG_MAX Of course, the TI 17.3 compiler freaks out at that. . Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, @FrdricHamidi: Unlikely; I've never seen a system with a 128-bit. I don't have GCC handy but you could check the stdint header. But the new types are also affected by it. The choice is arbitrary; all that's required is that it has to be a 64-bit type. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. Find centralized, trusted content and collaborate around the technologies you use most. Can virent/viret mean "green" in an adjectival sense? These are compiler options for GCC: Quote: -m32. Why does the C preprocessor interpret the word "linux" as the constant "1"? This means I can store values up to 2^63-1 in a long and 264-1 in an unsigned long. embedded system or ancient PC). Connect and share knowledge within a single location that is structured and easy to search. Debian/Ubuntu - Is there a man page listing all the version codenames/numbers? You declared it explicitly, but without an U, which would make it unsigned. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. To make an integer constant of type long long int, add the suffix LL to the integer. (for ease of testing) What does the C++ standard state the size of int, long type to be? [duplicate], long long int vs. long int vs. int64_t in C++, en.wikipedia.org/wiki/64-bit_computing#64-bit_data_models. Why is apparent power not measured in Watts? 2. ux uy 1 ux 1 uint64_t (x) 32 0 int64_t (int32_t (ux)) 32 1. unsigned long long test64= 0x123456789ABCDEF0; // 8 bytes long. But there are situations in which using the wrong type can cause problems, so generally you should append a suffix to such constants to ensure they match how they are intended to be used. unsigned long long conflict with uint64_t? Note: The 64-bit model for any given platform (e.g. instruction. LONG_MAX ULONG_MAX These are the maximum values that can be represented by a signed long int and unsigned long int, respectively. Find centralized, trusted content and collaborate around the technologies you use most. Sheesh. With over 10 pre-installed distros to choose from, the worry-free installation life is here! Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. To make an integer constant of type unsigned long How does the Chameleon's Arcane/Divine focus interact with magic item crafting? In 64-bit mode, it defines uint64_t as unsigned long. In order to accommodate you, the compiler is making its type unsigned long. For such types, you would need to use a C-style or C++-style cast instead, eg: Note, the
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