Builtin constant_p

Author: goqj

August undefined, 2024

WebComposite types ¶. The interpreter distinguishes two kinds of composite types: arrays and records (structs and classes). Unions are represented as records, except at most a single field can be marked as active. The contents of inactive fields are kept until they are reactivated and overwritten. Complex numbers ( _Complex) and vectors ... WebMay 15, 2010 · Because this is within the check for __builtin_constant_p(P), the compiler will only include that code for the appropriate pins. So far, nobody seems to care much about issue #146. Someday I'll get around to writing some test cases to demonstrate the problem. Trust me, it is real. The "nobody has ever complained in 5 years" is only …

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WebNov 15, 2024 · EDIT Update Dec30 2024: Likely the methods shown in this post are better solutions than what I have posted here though this still works for 16.2.1 on Pop!_OS … WebPerhaps this would suffice. The following excerpt from the documentation for __builtin_constant_p leads me to believe it will. "You can use the built-in function … the aim the of research design is to

[PATCH] compiler-gcc: require gcc 4.8 for powerpc __builtin…

Web2.14.4 __builtin_constant_p () __builtin_constant_p is a compiler builtin function. It takes a single numeric argument and returns 1 if the argument is a compile-time … WebComposite types ¶. The interpreter distinguishes two kinds of composite types: arrays and records (structs and classes). Unions are represented as records, except at most a … theft resistant flange

__builtin_constant_p(3) [netbsd man page] - UNIX

WebSep 28, 2024 · Possible missed optimization? Let's consider anyway that we want the memory allocated by alloca() to be 16-byte aligned. Even so, in the assembly code above, keeping in mind that GCC assumes the stack to be aligned to a 16-byte boundary at the moment of performing the function call (i.e., call foo), if we pay attention to the status of … http://web.mit.edu/rhel-doc/3/rhel-gcc-en-3/other-builtins.html the aim to doWebThe function is closely related to the concept of "constant folding" used by modern optimizing compilers. If the value is known to be a compile-time constant, a value 1 is returned. If __builtin_constant_p () returns 0, the value is not a compile-time constant in the sense that gcc (1) was unable to determine whether the value is constant or not. the aim trio

"WebAug 23, 2024 · And since (by definition) the value of __builtin_constant_p is known at compile time, only one branch of the if will be generated for any invocation of LeadingBit. Share. Follow edited Aug 24, 2024 at 23:25. answered Aug 24, 2024 at 10:13. David Wohlferd David Wohlferd. 7,038 2 2 ... " - Builtin constant_p

Builtin constant_p

WebFeb 25, 2012 · 3. I want to use gcc to do some compile-time checking on function inputs if the compiler knows that they are constants. I have a solution that very almost works, and as far as I can see, it should work. Note: __builtin_constant_p (expression) is supposed to returns whether an expression is known to be a constant at compile time. Web— Built-in Function: int __builtin_constant_p (exp). You can use the built-in function __builtin_constant_p to determine if a value is known to be constant at compile-time …

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WebThe __builtin_constant_p() is a GNU extension for determining whether a value is known to be constant at compile time. The function is closely related to the concept of … WebMar 30, 2024 · Alas, there are currently many restrictions of the use of statement expressions, including their use as constant initializers (for enum constants, bit-field width, etc.) even if the statement expression is completely constant its self (i.e., can be fully evaluated at compile-time and otherwise passes the __builtin_constant_p() test). …

WebI suspect it's specific to gcc 4.6. Stephen, can you confirm this patch fixes it? ---- From: Josh Poimboeuf Subject: [PATCH] compiler-gcc: require gcc 4.8 for powerpc __builtin_bswap16() gcc support for __builtin_bswap16() was supposedly added for powerpc in gcc 4.6, and was then later added for other architectures in gcc 4.8. WebApr 10, 2024 · select gcc-8 as compiler (version) -- press the number that points to gcc-8. sudo update-alternatives --config gcc. now cuda versions that require old gcc-versions work. sudo sh cuda_10.2.89_440.33.01_linux.run. (optional) -- select gcc-9 as compiler (version) -- press the number that points to gcc-8. Sign up for free to join this conversation ...

WebOct 9, 2024 · @geza Yeah, when searching, I found a commit in the Qt codebase where they removed constexpr from some functions, citing _BitScanForward as the reason, and they had equivalent functions using __builtin_clz on GCC, so I figured they're probably okay for constexpr. However, it wasn't explicitly stated there, and they removed constexpr … WebApr 21, 2024 · It can install a VM from ISO and run it but the VM cannot be restarted using the VM's restart command, and cannot be opened after reboot. Over the past month: I …

WebOct 3, 2024 · This is related to D4276, which I believe has been deleted.However, I believe that a modified version of that patch will work. The idea of this patch is *not* to be fully …

WebFeb 11, 2024 · All of them (except __builtin_constant_p and __builtin_object_size) are suffixed by _chk, which suggests they are hardened versions of the corresponding function from libc. Let's take a deeper look at these functions. Required compiler builtins. The following compiler builtins are required for -D_FORTIFY_SOURCE. … the aim was song诗歌翻译WebMay 5, 2024 · Do you mean that __builtin_constant_p() should be declared constexpr? It's a gcc builtin, so it's not a true function. Also, the same program does compile without … theft report formatWebMay 29, 2014 · A built-in function may choose, for example, not to evaluate its arguments: int main () { int i = 0; __builtin_constant_p (++i); // checks whether ++i is a constant expression // does not evaluate ++i return i; // returns 0 } This is because a built-in function can be transformed by the compiler into something else, that does not actually need ... theft resistant hardwareWeb__builtin_constant_p 是编译器内置函数。它接受一个数值参数，如果参数是一个编译时常量，则返回 1。返回值 0 意味着编译器无法确定参数是否是编译时常量。此内置函数的 … theft resistant microwave standWebBuilt-in Function: int __builtin_constant_p (exp) You can use the built-in function __builtin_constant_p to determine if a value is known to be constant at compile time and … The ‘int len’ before the semicolon is a parameter forward declaration, and it … Non-constant initializers. • Compound Literals: Compound literals give … -fno-builtin Don’t recognize built-in functions that do not begin with ‘ __builtin_ ’ as … It is handled as if the object were initialized only with the brace-enclosed list if the … — Built-in Function: int __builtin_constant_p (exp). You can use the built-in function … 6.60 Built-in Functions Specific to Particular Target Machines. On some target … — Built-in Function: int __builtin_constant_p (exp). You can use the built-in function … theft remedy conversion replevinWebAnd since "byteswap: try to avoid __builtin_constant_p gcc bug" is not in Linus' tree, hopefully we can have this fix applied soon. > From: Josh Poimboeuf > Subject: [PATCH] compiler-gcc: require gcc 4.8 for powerpc __builtin_bswap16() > > gcc support for __builtin_bswap16() was supposedly added … theft resistant cableWebIf __builtin_constant_p () returns 0, the value is not a compile-time constant in the sense that gcc (1) was unable to determine whether the value is constant or not. EXAMPLES … the aim trust plc