Builtin constant_p

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August undefined, 2024

WebIf __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 … Webpymor.discretizers.builtin.cg ¶. This module provides some operators for continuous finite element discretizations. Module Contents¶ pymor.discretizers.builtin.cg.

Constant Interpreter — Clang 17.0.0git documentation

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 … WebFeb 9, 2024 · For example _Static_assert() and __builtin_constant_p are currently used, even though they are from newer revisions of the C standard and a GCC extension respectively. If not available we respectively fall back to using a C99 compatible replacement that performs the same checks, but emits rather cryptic messages and do not use … portsmouth school department address

80265 – __builtin_{memcmp,memchr,strlen} are not usable in …

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 … 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 … 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 ... portsmouth school board candidates 2022

c - Programmatically determine if a variable

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 … 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 ... portsmouth school half termWebMay 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 … oracle application express インストール

"WebJan 13, 2024 · No, it worked around it by implementing char_traits a different way. We also use these functions in , e.g. std::equal uses __builtin_memcmp, and that needs to be constexpr too. We could keep using Pedro's trick everywhere, but it's not very scalable. Comment 23 Pedro Alves 2024-03-23 11:49:20 UTC. " - Builtin constant_p

Builtin constant_p

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 … WebMay 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 ...

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WebOct 21, 2024 · You can use the built-in function __builtin_constant_p to determine if a value is known to be constant at compile time and hence that GCC can perform constant-folding on expressions involving that value. The argument of the function is the value to test. The function returns the integer 1 if the argument is known to be a compile-time constant ... http://web.mit.edu/rhel-doc/3/rhel-gcc-en-3/other-builtins.html

WebThe 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. WebMessage ID: [email protected] (mailing list archive)State: New: Headers: show

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 … 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). …

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 …

WebAnd 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 … portsmouth school district employmentWebI 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. oracle application developer salaryWebLKML Archive on lore.kernel.org help / color / mirror / Atom feed From: kbuild test robot To: Miguel Ojeda Cc: [email protected], Linus Torvalds , [email protected], Miguel Ojeda , Eli Friedman … oracle application developer frameworkWebApr 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 … portsmouth school calendar 2023WebApr 1, 2024 · The text was updated successfully, but these errors were encountered: oracle application server 10g end of lifeWebI will add this > patch to linux-next today. > > And since "byteswap: try to avoid __builtin_constant_p gcc bug" is not > in Linus' tree, hopefully we can have this fix applied soon. > FYI, this patch is in Linus tree (v4.6-rc7 has it). oracle application framework developer guideWebApr 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 ... portsmouth school calendar 2021