Re: [PATCH v3] RISC-V: Replace zero_extendsidi2_shifted with generalized split

On Sat 6. Apr 2024 at 06:52, Jeff Law wrote: > > > On 3/27/24 4:55 AM, Philipp Tomsich wrote: > > Jeff, > > > > just a heads-up that that trunk (i.e., the soon-to-be GCC14) still > > generates the suboptimal sequence: > >https://godbolt.org/z/K9YYEPsvY > Realistically it's too late to get thi

Re: [PATCH v3] RISC-V: Replace zero_extendsidi2_shifted with generalized split

On 3/27/24 4:55 AM, Philipp Tomsich wrote: Jeff, just a heads-up that that trunk (i.e., the soon-to-be GCC14) still generates the suboptimal sequence: https://godbolt.org/z/K9YYEPsvY Realistically it's too late to get this into gcc-14. Jeff

Re: [PATCH v3] RISC-V: Replace zero_extendsidi2_shifted with generalized split

Jeff, just a heads-up that that trunk (i.e., the soon-to-be GCC14) still generates the suboptimal sequence: https://godbolt.org/z/K9YYEPsvY Thanks, Philipp. On Mon, 21 Nov 2022 at 18:00, Philipp Tomsich wrote: > > On Sun, 20 Nov 2022 at 17:38, Jeff Law wrote: > > > > > > On 11/9/22 16:10, P

Re: [PATCH v3] RISC-V: Replace zero_extendsidi2_shifted with generalized split

On Sun, 20 Nov 2022 at 17:38, Jeff Law wrote: > > > On 11/9/22 16:10, Philipp Tomsich wrote: > > The current method of treating shifts of extended values on RISC-V > > frequently causes sequences of 3 shifts, despite the presence of the > > 'zero_extendsidi2_shifted' pattern. > > > > Consider: > >

Re: [PATCH v3] RISC-V: Replace zero_extendsidi2_shifted with generalized split

On 11/9/22 16:10, Philipp Tomsich wrote: The current method of treating shifts of extended values on RISC-V frequently causes sequences of 3 shifts, despite the presence of the 'zero_extendsidi2_shifted' pattern. Consider: unsigned long f(unsigned int a, unsigned long b) {