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Enable AVX512_BF16 instructions, which are supported for BFLOAT16 in Cooper Lake

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Summary:
1. Enable infrastructure of AVX512_BF16, which is supported for BFLOAT16 in Cooper Lake;
2. Enable VCVTNE2PS2BF16, VCVTNEPS2BF16 and DPBF16PS  instructions, which are Vector Neural Network Instructions supporting BFLOAT16 inputs and conversion instructions from IEEE single precision.
VCVTNE2PS2BF16: Convert Two Packed Single Data to One Packed BF16 Data.
VCVTNEPS2BF16: Convert Packed Single Data to Packed BF16 Data.
VDPBF16PS: Dot Product of BF16 Pairs Accumulated into Packed Single Precision.
For more details about BF16 isa, please refer to the latest ISE document: https://software.intel.com/en-us/download/intel-architecture-instruction-set-extensions-programming-reference

Author: LiuTianle

Reviewers: craig.topper, smaslov, LuoYuanke, wxiao3, annita.zhang, RKSimon, spatel

Reviewed By: craig.topper

Subscribers: kristina, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D60550

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@360017 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Luo, Yuanke
2019-05-06 08:22:37 +00:00
parent 0d9a164240
commit 0e258a059f
10 changed files with 251 additions and 0 deletions
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lib/Support/Host.cpp
+3
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@@ -1375,6 +1375,9 @@ bool sys::getHostCPUFeatures(StringMap<bool> &Features) {
// detecting features using the "-march=native" flag.
// For more info, see X86 ISA docs.
Features["pconfig"] = HasLeaf7 && ((EDX >> 18) & 1);
bool HasLeaf7Subleaf1 =
MaxLevel >= 7 && !getX86CpuIDAndInfoEx(0x7, 0x1, &EAX, &EBX, &ECX, &EDX);
Features["avx512bf16"] = HasLeaf7Subleaf1 && ((EAX >> 5) & 1) && HasAVX512Save;
bool HasLeafD = MaxLevel >= 0xd &&
!getX86CpuIDAndInfoEx(0xd, 0x1, &EAX, &EBX, &ECX, &EDX);