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Differential D63055

[X86] NFCI : Comment updation for EVEX to VEX translation.
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Authored by jbhateja on Jun 9 2019, 2:22 AM.

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llvm-commits
jbhateja
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rG2a30aeb01073: [X86] NFCI : Comment updation for EVEX to VEX translation.
rL362898: [X86] NFCI : Comment updation for EVEX to VEX translation.

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rL LLVM

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jbhateja created this revision.Jun 9 2019, 2:22 AM
Herald added a project: Restricted Project. · View Herald TranscriptJun 9 2019, 2:22 AM
Herald added a subscriber: llvm-commits. · View Herald Transcript
Harbormaster completed remote builds in B33110: Diff 203726.Jun 9 2019, 2:23 AM
jbhateja accepted this revision.Jun 9 2019, 2:24 AM
jbhateja added a reviewer: llvm-commits.
This revision is now accepted and ready to land.Jun 9 2019, 2:24 AM
jbhateja updated this revision to Diff 203728.Jun 9 2019, 2:52 AM
  • Updating comment
Harbormaster completed remote builds in B33111: Diff 203728.Jun 9 2019, 2:52 AM
Closed by commit rL362898: [X86] NFCI : Comment updation for EVEX to VEX translation. (authored by jbhateja). · Explain WhyJun 9 2019, 2:58 AM
This revision was automatically updated to reflect the committed changes.

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llvm/
trunk/
lib/
Target/
X86/
6 lines

Diff 203729

llvm/trunk/lib/Target/X86/X86EvexToVex.cpp

//===- X86EvexToVex.cpp ---------------------------------------------------===// //===- X86EvexToVex.cpp ---------------------------------------------------===//
// Compress EVEX instructions to VEX encoding when possible to reduce code size // Compress EVEX instructions to VEX encoding when possible to reduce code size
// //
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information. // See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// //
//===----------------------------------------------------------------------===// //===----------------------------------------------------------------------===//
// //
/// \file /// \file
/// This file defines the pass that goes over all AVX-512 instructions which /// This file defines the pass that goes over all AVX-512 instructions which
/// are encoded using the EVEX prefix and if possible replaces them by their /// are encoded using the EVEX prefix and if possible replaces them by their
/// corresponding VEX encoding which is usually shorter by 2 bytes. /// corresponding VEX encoding which is usually shorter by 2 bytes.
/// EVEX instructions may be encoded via the VEX prefix when the AVX-512 /// EVEX instructions may be encoded via the VEX prefix when the AVX-512
/// instruction has a corresponding AVX/AVX2 opcode and when it does not /// instruction has a corresponding AVX/AVX2 opcode, when vector length
/// use the xmm or the mask registers or xmm/ymm registers with indexes /// accessed by instruction is less than 512 bits and when it does not use
/// higher than 15. // the xmm or the mask registers or xmm/ymm registers with indexes higher than 15.
/// The pass applies code reduction on the generated code for AVX-512 instrs. /// The pass applies code reduction on the generated code for AVX-512 instrs.
// //
//===----------------------------------------------------------------------===// //===----------------------------------------------------------------------===//
#include "MCTargetDesc/X86BaseInfo.h" #include "MCTargetDesc/X86BaseInfo.h"
#include "MCTargetDesc/X86InstComments.h" #include "MCTargetDesc/X86InstComments.h"
#include "X86.h" #include "X86.h"
#include "X86InstrInfo.h" #include "X86InstrInfo.h"
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