search for: avx512vl

...command line flags supported by latest GCC to clang. These flags will be used to limit the vector register size presented by TTI to the vectorizers. The backend will still be able to use wider registers for code written using the instrinsics in x86intrin.h. And the backend will still be able to use AVX512VL instructions and the additional XMM16-31 and YMM16-31 registers. Motivation: -Using 512-bit operations on some Intel CPUs may cause a decrease in CPU frequency that may offset the gains from using the wider register size. See section 15.26 of Intel® 64 and IA-32 Architectures Optimization Refer...

...on, I get these values: target_specific_cpu_args: skylake target_specific_features: +sse2,+cx16,-tbm,-avx512ifma,-avx512dq,-fma4,+prfchw,+bmi2,+xsavec,+fsgsbase,+popcnt,+aes,+xsaves,-avx512er,-avx512vpopcntdq,-clwb,-avx512f,-clzero,-pku,+mmx,-lwp,-xop,+rdseed,-sse4a,-avx512bw,+clflushopt,+xsave,-avx512vl,-avx512cd,+avx,-rtm,+fma,+bmi,+rdrnd,-mwaitx,+sse4.1,+sse4.2,+avx2,+sse,+lzcnt,+pclmul,-prefetchwt1,+f16c,+ssse3,+sgx,+cmov,-avx512vbmi,+movbe,+xsaveopt,-sha,+adx,-avx512pf,+sse3 It successfully creates a binary, but the binary when run crashes with: Unhandled exception at 0x00007FF7C9913BA7 in...

...nsequently, for the SKX architecture, many instructions that use only the lower registers of XMM0-XMM15 or YMM0-YMM15, can be encoded by either the EVEX or the VEX format. For such cases, using the VEX encoding results in a code size reduction of ~2 bytes even though it is compiled with the AVX512F/AVX512VL features enabled. For example: "vmovss %xmm0, 32(%rsp,%rax,4)", has the following 2 possible encodings: EVEX encoding (8 bytes long): 62 f1 7e 08 11 44 84 08 vmovss %xmm0, 32(%rsp,%rax,4) VEX encoding (6 bytes long): c5 fa 11 44 84 20...

...specific_cpu_args: skylake > > target_specific_features: +sse2,+cx16,-tbm,-avx512ifma,- > avx512dq,-fma4,+prfchw,+bmi2,+xsavec,+fsgsbase,+popcnt,+aes, > +xsaves,-avx512er,-avx512vpopcntdq,-clwb,-avx512f,-clzero,-pku,+mmx,- > lwp,-xop,+rdseed,-sse4a,-avx512bw,+clflushopt,+xsave,- > avx512vl,-avx512cd,+avx,-rtm,+fma,+bmi,+rdrnd,-mwaitx,+sse4. > 1,+sse4.2,+avx2,+sse,+lzcnt,+pclmul,-prefetchwt1,+f16c,+ > ssse3,+sgx,+cmov,-avx512vbmi,+movbe,+xsaveopt,-sha,+adx,-avx512pf,+sse3 > > > It successfully creates a binary, but the binary when run crashes with: > > Unhandled e...

...on this since the result of an actual calculation was wrong. So, it's not only the text version of the assembler also the machine assembler is wrong. When I execute the exploit program on an Intel KNL the following output is produced: CPU name = knl -sse4a,-avx512bw,cx16,-tbm,xsave,-fma4,-avx512vl,prfchw,bmi2,adx,-xsavec,fsgsbase,avx,avx512cd,avx512pf,-rtm,popcnt,fma,bmi,aes,rdrnd,-xsaves,sse4.1,sse4.2,avx2,avx512er,sse,lzcnt,pclmul,avx512f,f16c,ssse3,mmx,-pku,cmov,-xop,rdseed,movbe,-hle,xsaveopt,-sha,sse2,sse3,-avx512dq, Assembly: .text .file "module_KFxOBX_i4_after.ll&quo...

...culation was wrong. So, it's not only the text version of > the > assembler also the machine assembler is wrong. > > When I execute the exploit program on an Intel KNL the following > output > is produced: > > CPU name = knl > -sse4a,-avx512bw,cx16,-tbm,xsave,-fma4,-avx512vl,prfchw,bmi2,adx,-xsavec,fsgsbase,avx,avx512cd,avx512pf,-rtm,popcnt,fma,bmi,aes,rdrnd,-xsaves,sse4.1,sse4.2,avx2,avx512er,sse,lzcnt,pclmul,avx512f,f16c,ssse3,mmx,-pku,cmov,-xop,rdseed,movbe,-hle,xsaveopt,-sha,sse2,sse3,-avx512dq, > Assembly: > .text > .file "module_KFxOBX_...

...ot only the text version of >> the >> assembler also the machine assembler is wrong. >> >> When I execute the exploit program on an Intel KNL the following >> output >> is produced: >> >> CPU name = knl >> -sse4a,-avx512bw,cx16,-tbm,xsave,-fma4,-avx512vl,prfchw,bmi2,adx,-xsavec,fsgsbase,avx,avx512cd,avx512pf,-rtm,popcnt,fma,bmi,aes,rdrnd,-xsaves,sse4.1,sse4.2,avx2,avx512er,sse,lzcnt,pclmul,avx512f,f16c,ssse3,mmx,-pku,cmov,-xop,rdseed,movbe,-hle,xsaveopt,-sha,sse2,sse3,-avx512dq, >> Assembly: >> .text >> .file "...

...st GCC to clang. These flags will be >> used to limit the vector register size presented by TTI to the vectorizers. >> The backend will still be able to use wider registers for code written >> using the instrinsics in x86intrin.h. And the backend will still be able to >> use AVX512VL instructions and the additional XMM16-31 and YMM16-31 >> registers. >> >> >> >> Motivation: >> >> -Using 512-bit operations on some Intel CPUs may cause a decrease in CPU >> frequency that may offset the gains from using the wider register size. See &...

...SKX architecture, many instructions that use only > the lower registers of XMM0-XMM15 or YMM0-YMM15, can be encoded by either > the EVEX or the VEX format. For such cases, using the VEX encoding results > in a code size reduction of ~2 bytes even though it is compiled with the > AVX512F/AVX512VL features enabled. > > > > For example: “vmovss %xmm0, 32(%rsp,%rax,4)“, has the following 2 > possible encodings: > > > > EVEX encoding (8 bytes long): > > 62 f1 7e 08 11 44 84 08 vmovss %xmm0, 32(%rsp,%rax,4) > > > > VEX encoding (...

...> target_specific_features: +sse2,+cx16,-tbm,-avx512ifma,- >>> avx512dq,-fma4,+prfchw,+bmi2,+xsavec,+fsgsbase,+popcnt,+aes, >>> +xsaves,-avx512er,-avx512vpopcntdq,-clwb,-avx512f,-clzero,-p >>> ku,+mmx,-lwp,-xop,+rdseed,-sse4a,-avx512bw,+clflushopt,+xsav >>> e,-avx512vl,-avx512cd,+avx,-rtm,+fma,+bmi,+rdrnd,-mwaitx,+ >>> sse4.1,+sse4.2,+avx2,+sse,+lzcnt,+pclmul,-prefetchwt1,+ >>> f16c,+ssse3,+sgx,+cmov,-avx512vbmi,+movbe,+xsaveopt,- >>> sha,+adx,-avx512pf,+sse3 >>> >>> >>> It successfully creates a binary, but t...

...> >>> used to limit the vector register size presented by TTI to the vectorizers. > >>> The backend will still be able to use wider registers for code written > >>> using the instrinsics in x86intrin.h. And the backend will still be able to > >>> use AVX512VL instructions and the additional XMM16-31 and YMM16-31 > >>> registers. > >>> > >>> > >>> > >>> Motivation: > >>> > >>> -Using 512-bit operations on some Intel CPUs may cause a decrease in CPU > >>> frequ...

...nsequently, for the SKX architecture, many instructions that use only the lower registers of XMM0-XMM15 or YMM0-YMM15, can be encoded by either the EVEX or the VEX format. For such cases, using the VEX encoding results in a code size reduction of ~2 bytes even though it is compiled with the AVX512F/AVX512VL features enabled. For example: “vmovss %xmm0, 32(%rsp,%rax,4)“, has the following 2 possible encodings: EVEX encoding (8 bytes long): 62 f1 7e 08 11 44 84 08 vmovss %xmm0, 32(%rsp,%rax,4) VEX encoding (6 bytes long): c5 fa 11 44 84 20 vmovss...

...ize presented by TTI to the >> vectorizers. >> > >>> The backend will still be able to use wider registers for code >> written >> > >>> using the instrinsics in x86intrin.h. And the backend will still be >> able to >> > >>> use AVX512VL instructions and the additional XMM16-31 and YMM16-31 >> > >>> registers. >> > >>> >> > >>> >> > >>> >> > >>> Motivation: >> > >>> >> > >>> -Using 512-bit operations on some...

...nsequently, for the SKX architecture, many instructions that use only the lower registers of XMM0-XMM15 or YMM0-YMM15, can be encoded by either the EVEX or the VEX format. For such cases, using the VEX encoding results in a code size reduction of ~2 bytes even though it is compiled with the AVX512F/AVX512VL features enabled. For example: “vmovss %xmm0, 32(%rsp,%rax,4)“, has the following 2 possible encodings: EVEX encoding (8 bytes long): 62 f1 7e 08 11 44 84 08 vmovss %xmm0, 32(%rsp,%rax,4) VEX encoding (6 bytes long): c5 fa 11 44 84 20 vmovss...

...torizers. >>>> > >>> The backend will still be able to use wider registers for code >>>> written >>>> > >>> using the instrinsics in x86intrin.h. And the backend will still >>>> be able to >>>> > >>> use AVX512VL instructions and the additional XMM16-31 and YMM16-31 >>>> > >>> registers. >>>> > >>> >>>> > >>> >>>> > >>> >>>> > >>> Motivation: >>>> > >>> >>>...

...>>> The backend will still be able to use wider registers for code >>>>>> written >>>>>> > >>> using the instrinsics in x86intrin.h. And the backend will >>>>>> still be able to >>>>>> > >>> use AVX512VL instructions and the additional XMM16-31 and >>>>>> YMM16-31 >>>>>> > >>> registers. >>>>>> > >>> >>>>>> > >>> >>>>>> > >>> >>>>>> > >&gt...

...that the run-time selection takes full support coverage (from silicon to the kernel) into account. * Level C AVX2, BMI1, BMI2, F16C, FMA, LZCNT, MOVBE, plus everything in level B. This is close to what glibc currently calls "haswell". * Level D AVX512F, AVX512BW, AVX512CD, AVX512DQ, AVX512VL, plus everything in level C. This is the AVX-512 level implemented by Xeon Scalable Processors, not the Xeon Phi variant. glibc (or an alternative loader implementation) would search for libraries starting at level D, going back to level A, and finally the baseline implementation in the default...

...backend will still be able to use wider registers for code >>>>>>> written >>>>>>> > >>> using the instrinsics in x86intrin.h. And the backend will >>>>>>> still be able to >>>>>>> > >>> use AVX512VL instructions and the additional XMM16-31 and >>>>>>> YMM16-31 >>>>>>> > >>> registers. >>>>>>> > >>> >>>>>>> > >>> >>>>>>> > >>> >>>>&...

...rs for code written >> > >>> using the instrinsics in >> x86intrin.h. And the backend will >> still be able to >> > >>> use AVX512VL instructions and >> the additional XMM16-31 and YMM16-31 >> > >>> registers. >> > >>> >> > >>> >>...

...rs for >>>>>>>>>> code written >>>>>>>>>> > >>> using the instrinsics in x86intrin.h. And the backend will >>>>>>>>>> still be able to >>>>>>>>>> > >>> use AVX512VL instructions and the additional XMM16-31 and >>>>>>>>>> YMM16-31 >>>>>>>>>> > >>> registers. >>>>>>>>>> > >>> >>>>>>>>>> > >>> >>>>...