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This is skylake-avx512 with the addition of avx512vnni ISA.
Patch by Jianping Chen
Differential Revision: https://reviews.llvm.org/D54792
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@347682 91177308-0d34-0410-b5e6-96231b3b80d8
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multiversioning.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@344929 91177308-0d34-0410-b5e6-96231b3b80d8
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As documented here: https://software.intel.com/en-us/node/682969 and
https://software.intel.com/en-us/node/523346. cpu_dispatch multiversioning
is an ICC feature that provides for function multiversioning.
This feature is implemented with two attributes: First, cpu_specific,
which specifies the individual function versions. Second, cpu_dispatch,
which specifies the location of the resolver function and the list of
resolvable functions.
This is valuable since it provides a mechanism where the resolver's TU
can be specified in one location, and the individual implementions
each in their own translation units.
The goal of this patch is to be source-compatible with ICC, so this
implementation diverges from the ICC implementation in a few ways:
1- Linux x86/64 only: This implementation uses ifuncs in order to
properly dispatch functions. This is is a valuable performance benefit
over the ICC implementation. A future patch will be provided to enable
this feature on Windows, but it will obviously more closely fit ICC's
implementation.
2- CPU Identification functions: ICC uses a set of custom functions to identify
the feature list of the host processor. This patch uses the cpu_supports
functionality in order to better align with 'target' multiversioning.
1- cpu_dispatch function def/decl: ICC's cpu_dispatch requires that the function
marked cpu_dispatch be an empty definition. This patch supports that as well,
however declarations are also permitted, since the linker will solve the
issue of multiple emissions.
Differential Revision: https://reviews.llvm.org/D47474
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@337552 91177308-0d34-0410-b5e6-96231b3b80d8
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Reviewers: craig.topper
Reviewed By: craig.topper
Subscribers: cfe-commits
Differential Revision: https://reviews.llvm.org/D45613
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@330110 91177308-0d34-0410-b5e6-96231b3b80d8
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Reviewers: craig.topper, zvi, echristo
Reviewed By: craig.topper
Differential Revision: https://reviews.llvm.org/D45056
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@329741 91177308-0d34-0410-b5e6-96231b3b80d8
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GCC's attribute 'target', in addition to being an optimization hint,
also allows function multiversioning. We currently have the former
implemented, this is the latter's implementation.
This works by enabling functions with the same name/signature to coexist,
so that they can all be emitted. Multiversion state is stored in the
FunctionDecl itself, and SemaDecl manages the definitions.
Note that it ends up having to permit redefinition of functions so
that they can all be emitted. Additionally, all versions of the function
must be emitted, so this also manages that.
Note that this includes some additional rules that GCC does not, since
defining something as a MultiVersion function after a usage has been made illegal.
The only 'history rewriting' that happens is if a function is emitted before
it has been converted to a multiversion'ed function, at which point its name
needs to be changed.
Function templates and virtual functions are NOT yet supported (not supported
in GCC either).
Additionally, constructors/destructors are disallowed, but the former is
planned.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@322028 91177308-0d34-0410-b5e6-96231b3b80d8
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git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@318617 91177308-0d34-0410-b5e6-96231b3b80d8
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git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@318345 91177308-0d34-0410-b5e6-96231b3b80d8
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