search for: evex

...nstruction 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 bytes: 4 1 1 1 4 / 1 1 The existing VEX encoding format: [VEX] OPCODE ModR/M...

I would like a command line option to disable this optimization. That way tests can still verify that EVEX instructions came out of isel by using -show-mc-encoding. On Wed, Nov 23, 2016 at 5:01 AM Hal Finkel via llvm-dev < llvm-dev at lists.llvm.org> wrote: > > ------------------------------ > > *From: *"Gadi via llvm-dev Haber" <llvm-dev at lists.llvm.org> > *To:...

> I would like a command line option to disable this optimization. That way tests can still verify that EVEX instructions came out of isel by using -show-mc-encoding. I think that keeping tests compatibility is not a reason for an additional “llc” flag. We check encoding in test/MC/X86 dir. Is there any option to report-out from llc in non-debug mode? It should be an option to control internals of llc p...

...let us know. From: llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] On Behalf Of Hal Finkel via llvm-dev Sent: Wednesday, November 23, 2016 15:01 To: Haber, Gadi <gadi.haber at intel.com> Cc: llvm-dev at lists.llvm.org Subject: Re: [llvm-dev] RFC: code size reduction in X86 by replacing EVEX with VEX encoding ________________________________ From: "Gadi via llvm-dev Haber" <llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>> To: llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org> Sent: Wednesday, November 23, 2016 5:50:42 AM Subject: [...

...strinfo.td i wrote; def VMOV_256B_RM : I<0x6F, MRMSrcMem, (outs VR2048:$dst), (ins i32mem:$src), "vmov_256B_rm\t{$src, $dst|$dst, $src}", [(set VR2048:$dst, (v64i32 (scalar_to_vector (loadi32 addr:$src))))], IIC_MOV_MEM>, EVEX; def VMOV_256B_MR : I<0x7F, MRMDestMem, (outs), (ins i32mem:$dst, VR2048:$src), "vmov_256B_mr\t{$src, $dst|$dst, $src}", [(store (i32 (bitconvert VR2048:$src)), addr:$dst)], IIC_MOV_MEM>, EVEX; here i have already define VR2048 in x86registe...

I was getting same error when i keep both EVEX/EVEX_4V and TA. So, i restored my original instructions and for that i have to include bool HasTA = TSFlags & X86II::TA; in x86MCCodeEmitter.cpp then used this condition; if(HasTA) ++SrcRegNum; in order to emit binary correctly. Is it right? On Tue, Sep 5, 2017 at 5:45 AM, Craig To...

Thank You, I changed TA to EVEX or EVEX_4V. But now i am getting following error: Invalid prefix! UNREACHABLE executed at /lib/Target/X86/MCTargetDesc/X86MCCodeEmitter.cpp:647! On Tue, Sep 5, 2017 at 4:36 AM, Craig Topper <craig.topper at gmail.com> wrote: > Not all instructions can use EVEX_4V. Move instructions in...

...s the instruction requires the REX.W it to be set. hasLockPrefix - Indicates the instruction should be encoded with a 0xF0 lock prefix. hasREPPrefix - Indicates the instruction should be encoded with a 0xF3 rep prefix. OpcEnc - Which encoding scheme this instruction uses. Normal, VEX, EVEX, or XOP. VEX_WPrefix - Controls the value of the VEX.W bit in the encoder also tells the disassembler which instructions ignore VEX.W. hasVEX_4V - Does this instruction use VEX.vvvv hasVEX_L - Should this instruction be encoded with VEX.L=1 ignoresVEX_L - Tells the disassembler...

I am attempting to create an instruction which takes a single 64-bit immediate. This doesn't seem like a thing that would exist already (because who needs an instruction which just takes an immediate?) How might I implement this easily? Perhaps I could use a format which encodes a register, which is then unused? Thanks for the help. Gus -------------- next part -------------- An HTML

Hello Matthias, On 28 July 2017 at 04:13, Matthias Braun <mbraun at apple.com> wrote: > It's not that hard in principle: > - A register class is a set of registers. > - Virtual Registers have a register class assigned. > - If you have register constraints (like x86 8bit operations only work on > al,ah,etc.) then you have to create a new register class to express that.

Thank You. I used EVEX_4V with all the instructions. I replaced TA and EVEX both with EVEX_4V. Now, I am getting following error: llvm-tblgen: /utils/TableGen/X86RecognizableInstr.cpp:687: void llvm::X86Disassembler::RecognizableInstr::emitInstructionSpecifier(): Assertion `numPhysicalOperands >= 2 + additionalOperan...

...imple-register-coalescing -slotindexes -spill-code-placement -stack-coloring -stackmap-liveness-livedebugvalues -stack-slot-coloring -tailduplication -unreachable-mbb-elimination -virtregmap -virtregrewriter -x86-avoid-SFB -x86-cf-opt -x86-cmov-conversion -x86-domain-reassignment -x86-evex-to-vex-compress -x86-execution-domain-fix -x86-fixup-bw-insts -x86-fixup-LEAs -x86-optimize-LEAs -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20200702/2f0a59dc/attachment.html>

...t; -tailduplication >> >> -unreachable-mbb-elimination >> >> -virtregmap >> >> -virtregrewriter >> >> -x86-avoid-SFB >> >> -x86-cf-opt >> >> -x86-cmov-conversion >> >> -x86-domain-reassignment >> >> -x86-evex-to-vex-compress >> >> -x86-execution-domain-fix >> >> -x86-fixup-bw-insts >> >> -x86-fixup-LEAs >> >> -x86-optimize-LEAs >> >> >> _______________________________________________ >> LLVM Developers mailing list >> llvm-dev...

..., >>>>>>>>>>>>>> [(set VR2048:$dst, (v64i32 >>>>>>>>>>>>>> (scalar_to_vector (loadi32 addr:$src))))], >>>>>>>>>>>>>> IIC_MOV_MEM>, EVEX; >>>>>>>>>>>>>> >>>>>>>>>>>>>> def VMOV_256B_MR : I<0x7F, MRMDestMem, (outs), (ins >>>>>>>>>>>>>> i32mem:$dst, VR2048:$src), >>>>>>>>>>>&...

...uctions so i wrote; def VMOV_256B_RM : I<0x6F, MRMSrcMem, (outs VR2048:$dst), (ins i32mem:$src), "vmov_256B_rm\t{$src, $dst|$dst, $src}", [(set VR2048:$dst, (v64i32 (scalar_to_vector (loadi32 addr:$src))))], IIC_MOV_MEM>, EVEX; def VMOV_256B_MR : I<0x7F, MRMDestMem, (outs), (ins i32mem:$dst, VR2048:$src), "vmov_256B_mr\t{$src, $dst|$dst, $src}", [(store (i32 (bitconvert VR2048:$src)), addr:$dst)], IIC_MOV_MEM>, EVEX; in x86instrinfo.td; when i build i got these i...

...ns >>>> i32mem:$src), >>>> "vmov_256B_rm\t{$src, $dst|$dst, $src}", >>>> [(set VR2048:$dst, (v64i32 (scalar_to_vector >>>> (loadi32 addr:$src))))], >>>> IIC_MOV_MEM>, EVEX; >>>> >>>> def VMOV_256B_MR : I<0x7F, MRMDestMem, (outs), (ins i32mem:$dst, >>>> VR2048:$src), >>>> "vmov_256B_mr\t{$src, $dst|$dst, $src}", >>>> [(store (i32 (bitconvert VR2048:$src)),...

[NOTE: Removed Phab and reviewers] > ================ > Comment at: test/CodeGen/X86/2012-01-12-extract-sv.ll:12 > +; CHECK-NEXT: vblendps {{.*#+}} xmm1 = xmm1[0],xmm2[1,2,3] > +; CHECK-NEXT: vpermilps {{.*#+}} xmm0 = xmm0[0,0,0,0] > ; CHECK-NEXT: vinsertf128 $1, %xmm0, %ymm0, %ymm0 > ---------------- > greened wrote: >> Can we make this test less brittle by

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...s. So ideally you would know which function was originally > used in the user code and call that. Yes, you are right. Such optimization at IR level probably does not make sense. Thanks, --Serge On Tue, Mar 3, 2020 at 11:41 PM Craig Topper <craig.topper at gmail.com> wrote: > Note, EVEX static rounding forces suppress all exceptions. You can't have > static rounding with exceptions. > > We're also talking about making the vector predicated floating point > intrinsics that Simon Moll is working on support both strict and non-strict > using operand bundles. So...

...> for that. When making such plan we should keep in mind that some targets encode rounding mode in instructions, rather than in some hardware register. In this case "floating point environment" is an attribute of particular instruction. By the way, X86 target also has such property: EVEX prefix allows static rounding support or suppress-all-exceptions. Such properties are naturally modeled with metadata operands but splitting to constrained and non-constrained variants makes little sense. My suggestion would be that we should set the strictfp attribute on these > intrinsics and...