[AMD Official Use Only] There are actually couple things worth to try if that is easy:
https://reviews.llvm.org/D109077 https://reviews.llvm.org/differential/diff/374324/ Both may slightly change spill weights and then spilling pattern. Stas -----Original Message----- From: Mekhanoshin, Stanislav Sent: Wednesday, September 22, 2021 12:09 To: Maxim Kuvyrkov <maxim.kuvyr...@linaro.org> Cc: linaro-toolchain <linaro-toolchain@lists.linaro.org> Subject: RE: [TCWG CI] 456.hmmer slowed down by 6% after llvm: Allow rematerialization of virtual reg uses I assume some of the newly rematerialized instructions caused perf drops. Probably some very specific ones. I would appreciate if you could point them to me. In addition I believe I would need to have a linked or optimized bitcode to feed into llc. Stas -----Original Message----- From: Maxim Kuvyrkov <maxim.kuvyr...@linaro.org> Sent: Wednesday, September 22, 2021 12:06 To: Mekhanoshin, Stanislav <stanislav.mekhanos...@amd.com> Cc: linaro-toolchain <linaro-toolchain@lists.linaro.org> Subject: Re: [TCWG CI] 456.hmmer slowed down by 6% after llvm: Allow rematerialization of virtual reg uses [CAUTION: External Email] Hi Stanislav, That's fair; I or someone from Linaro will try to analyze this and follow up here. On a more general note, what info would you like to see in these benchmarking regression reports? Thanks, -- Maxim Kuvyrkov https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.linaro.org%2F&data=04%7C01%7CStanislav.Mekhanoshin%40amd.com%7Ccb8b53f8e69f4fa8b2d508d97dfc017a%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637679343573433629%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=FP9FReEFKUi0Pvr%2FB1K3Z1VB%2BL2EuU7GqqZx2XOnawE%3D&reserved=0 > On Sep 22, 2021, at 9:40 PM, Mekhanoshin, Stanislav > <stanislav.mekhanos...@amd.com> wrote: > > [AMD Official Use Only] > > Hm... I'd really like to help, but I do not think I can do anything with > megabytes of code in an asm which I do not understand and tons of differences > in 48 asm files. > What I can see there is overall less spilling code which was the intent in > the first place: hmmer has 4 less spill opcodes overall and sphinx has 27 > less of them. > I doubt I could say much more without someone pointing to the actual root > cause. > > Stas > > -----Original Message----- > From: Maxim Kuvyrkov <maxim.kuvyr...@linaro.org> > Sent: Wednesday, September 22, 2021 5:16 > To: Mekhanoshin, Stanislav <stanislav.mekhanos...@amd.com> > Cc: linaro-toolchain <linaro-toolchain@lists.linaro.org> > Subject: Re: [TCWG CI] 456.hmmer slowed down by 6% after llvm: Allow > rematerialization of virtual reg uses > > [CAUTION: External Email] > > Hi Stanislav, > > Attached is a tarball with -save-temps output (pre-processed source and > generated assembly) for first-bad run (your commit) and last-good run > (immediate parent of your commit). > > -- > Maxim Kuvyrkov > https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.linaro.org%2F&data=04%7C01%7CStanislav.Mekhanoshin%40amd.com%7Ccb8b53f8e69f4fa8b2d508d97dfc017a%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637679343573433629%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=FP9FReEFKUi0Pvr%2FB1K3Z1VB%2BL2EuU7GqqZx2XOnawE%3D&reserved=0 > >> On 20 Sep 2021, at 23:15, Mekhanoshin, Stanislav >> <stanislav.mekhanos...@amd.com> wrote: >> >> [AMD Official Use Only] >> >> Thanks for letting me know. Some regressions are inevitable, however do you >> happen to have any analysis and dumps? I myself do not understand ARM ISA >> well... >> >> Stas >> >> -----Original Message----- >> From: Maxim Kuvyrkov <maxim.kuvyr...@linaro.org> >> Sent: Wednesday, September 15, 2021 5:52 >> To: Mekhanoshin, Stanislav <stanislav.mekhanos...@amd.com> >> Cc: linaro-toolchain <linaro-toolchain@lists.linaro.org> >> Subject: Re: [TCWG CI] 456.hmmer slowed down by 6% after llvm: Allow >> rematerialization of virtual reg uses >> >> [CAUTION: External Email] >> >> Hi Stanislav, >> >> FYI, your patch seems to be slowing down two of SPEC CPU2006 tests on 32-bit >> ARM at -O2 and -O3 optimization levels. >> >> -- >> Maxim Kuvyrkov >> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.linaro.org%2F&data=04%7C01%7CStanislav.Mekhanoshin%40amd.com%7Ccb8b53f8e69f4fa8b2d508d97dfc017a%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637679343573433629%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=FP9FReEFKUi0Pvr%2FB1K3Z1VB%2BL2EuU7GqqZx2XOnawE%3D&reserved=0 >> > > _______________________________________________ linaro-toolchain mailing list linaro-toolchain@lists.linaro.org https://lists.linaro.org/mailman/listinfo/linaro-toolchain
