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...hese 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 Reference Manual published October 2017. -The vector AL...

...ecific X86 optimization for reducing code size in the encoding of AVX-512 instructions when possible. When the AVX512F instruction set was introduced in X86 it included additional 32 registers of 512bit size each ZMM0 - ZMM31, as well as additional 16 XMM registers XMM16-XMM31 and 16 YMM registers YMM16-YMM31. In order to encode the new registers of 16-31 and the additional instructions, a new encoding prefix called EVEX, which extends the existing VEX encoding, was introduced as shown below: The EVEX encoding format: EVEX Opcode ModR/M [SIB] [Disp32] / [Disp8*N] [Immediate] # of byte...

...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 Archit...

...educing code size in the encoding of AVX-512 instructions when possible. > > > > When the AVX512F instruction set was introduced in X86 it included > additional 32 registers of 512bit size each ZMM0 - ZMM31, as well as > additional 16 XMM registers XMM16-XMM31 and 16 YMM registers YMM16-YMM31. > > In order to encode the new registers of 16-31 and the additional > instructions, a new encoding prefix called EVEX, which extends the > existing VEX encoding, was introduced as shown below: > > > > The EVEX encoding format: > > EVEX Opcode ModR/M...

...;>>> * vpgatherqd ymm15 {k2}, zmmword ptr [zmm16]* >>>>> * vinserti64x4 zmm14, zmm15, ymm14, 1* >>>>> * kmovw k2, k1* >>>>> * vpgatherqd ymm15 {k2}, zmmword ptr [zmm19]* >>>>> * kxnorw k2, k0, k0* >>>>> * vpgatherqd ymm16 {k2}, zmmword ptr [zmm18]* >>>>> * vinserti64x4 zmm15, zmm16, ymm15, 1* >>>>> * kmovw k2, k1* >>>>> * vpgatherqd ymm1 {k2}, zmmword ptr [zmm21]* >>>>> * kxnorw k2, k0, k0* >>>>> * vpgatherqd ymm16 {k2}, zmmword ptr [zmm20]*...

...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 Intel CPUs may cause a decrease in CPU > >>> frequency that may offset the gains from using the wider...

...ecific X86 optimization for reducing code size in the encoding of AVX-512 instructions when possible. When the AVX512F instruction set was introduced in X86 it included additional 32 registers of 512bit size each ZMM0 - ZMM31, as well as additional 16 XMM registers XMM16-XMM31 and 16 YMM registers YMM16-YMM31. In order to encode the new registers of 16-31 and the additional instructions, a new encoding prefix called EVEX, which extends the existing VEX encoding, was introduced as shown below: The EVEX encoding format: EVEX Opcode ModR/M [SIB] [Disp32] / [Disp8*N] [Immediate] # of byte...

...> > >>> 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 &g...

...ecific X86 optimization for reducing code size in the encoding of AVX-512 instructions when possible. When the AVX512F instruction set was introduced in X86 it included additional 32 registers of 512bit size each ZMM0 - ZMM31, as well as additional 16 XMM registers XMM16-XMM31 and 16 YMM registers YMM16-YMM31. In order to encode the new registers of 16-31 and the additional instructions, a new encoding prefix called EVEX, which extends the existing VEX encoding, was introduced as shown below: The EVEX encoding format: EVEX Opcode ModR/M [SIB] [Disp32] / [Disp8*N] [Immediate] # of byte...

...nd 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...

...;>>>>> 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: >>>>>> > >>> >>>&gt...

...;> 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: >>>>>>> > >...

...nsics in >> x86intrin.h. And the backend will >> still be able to >> > >>> use AVX512VL instructions and >> the additional XMM16-31 and YMM16-31 >> > >>> registers. >> > >>> >> > >>> >> > >>> >> > &gt...

...t;> > >>> 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...