Re: [PATCH 05/17] powerpc: Add __attribute_const__ to ffs()-family implementations
From: Segher Boessenkool <hidden>
Date: 2025-08-15 16:42:12
Also in:
linux-alpha, linux-arch, linux-hardening, linux-m68k, linux-mips, linux-riscv, linux-s390, linux-sh, lkml, llvm, sparclinux
On Fri, Aug 15, 2025 at 11:34:56AM -0500, Segher Boessenkool wrote:
On Thu, Aug 07, 2025 at 03:16:35PM +0530, Madhavan Srinivasan wrote:quoted
making them eligible for compiler optimization.You can instead use GCC for this. __builtin_ffs () exists since 2003,
Erm, 1992 actually, but stuff has moved around since then :-)
and has this attribute built-in, as well as tens of other optimisations that the kernel thing misses. Of course using existing stuff instead of cobbling together something half working prevents you from having a lot of fun ;-)
Segher