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Hi All. This is an RFC for a proposed target specific 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

...gt; lib/Target/Hexagon/Hexagon.td > lib/Target/Mips/MipsDSPInstrFormats.td > lib/Target/Mips/MipsInstrFormats.td > lib/Target/Mips/Mips32r6InstrFormats.td > lib/Target/PowerPC/PPC.td > lib/Target/AMDGPU/SIInstrInfo.td > lib/Target/AMDGPU/R600Instructions.td > lib/Target/SystemZ/SystemZInstrFormats.td > lib/Target/Lanai/LanaiInstrInfo.td > > I've used this feature a few times in the PowerPC backend, and it's quite > convenient. > > -Hal > > No need for special Opt flags, as it is always better to use the reduced > VEX encoding when possible. > > >...

...r examples, grep for InstrMapping in: lib/Target/Hexagon/Hexagon.td lib/Target/Mips/MipsDSPInstrFormats.td lib/Target/Mips/MipsInstrFormats.td lib/Target/Mips/Mips32r6InstrFormats.td lib/Target/PowerPC/PPC.td lib/Target/AMDGPU/SIInstrInfo.td lib/Target/AMDGPU/R600Instructions.td lib/Target/SystemZ/SystemZInstrFormats.td lib/Target/Lanai/LanaiInstrInfo.td I've used this feature a few times in the PowerPC backend, and it's quite convenient. -Hal No need for special Opt flags, as it is always better to use the reduced VEX encoding when possible. Thank you for any comments or questions that you may hav...

...r examples, grep for InstrMapping in: lib/Target/Hexagon/Hexagon.td lib/Target/Mips/MipsDSPInstrFormats.td lib/Target/Mips/MipsInstrFormats.td lib/Target/Mips/Mips32r6InstrFormats.td lib/Target/PowerPC/PPC.td lib/Target/AMDGPU/SIInstrInfo.td lib/Target/AMDGPU/R600Instructions.td lib/Target/SystemZ/SystemZInstrFormats.td lib/Target/Lanai/LanaiInstrInfo.td I've used this feature a few times in the PowerPC backend, and it's quite convenient. -Hal No need for special Opt flags, as it is always better to use the reduced VEX encoding when possible. Thank you for any comments or questions that you may have...