Implement Attribute Target MultiVersioning
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.
llvm-svn: 322028
2018-01-09 05:34:17 +08:00
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// RUN: %clang_cc1 -std=c++11 -triple x86_64-linux-gnu -emit-llvm %s -o - | FileCheck %s
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// Test ensures that this properly differentiates between types in different
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// namespaces.
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int __attribute__((target("sse4.2"))) foo(int) { return 0; }
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int __attribute__((target("arch=sandybridge"))) foo(int);
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int __attribute__((target("arch=ivybridge"))) foo(int) {return 1;}
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int __attribute__((target("default"))) foo(int) { return 2; }
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namespace ns {
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int __attribute__((target("sse4.2"))) foo(int) { return 0; }
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int __attribute__((target("arch=sandybridge"))) foo(int);
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int __attribute__((target("arch=ivybridge"))) foo(int) {return 1;}
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int __attribute__((target("default"))) foo(int) { return 2; }
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}
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int bar() {
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return foo(1) + ns::foo(2);
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}
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// CHECK: @_Z3fooi.ifunc = ifunc i32 (i32), i32 (i32)* ()* @_Z3fooi.resolver
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// CHECK: @_ZN2ns3fooEi.ifunc = ifunc i32 (i32), i32 (i32)* ()* @_ZN2ns3fooEi.resolver
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// CHECK: define i32 @_Z3fooi.sse4.2(i32)
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// CHECK: ret i32 0
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// CHECK: define i32 @_Z3fooi.arch_ivybridge(i32)
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// CHECK: ret i32 1
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// CHECK: define i32 @_Z3fooi(i32)
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// CHECK: ret i32 2
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// CHECK: define i32 @_ZN2ns3fooEi.sse4.2(i32)
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// CHECK: ret i32 0
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// CHECK: define i32 @_ZN2ns3fooEi.arch_ivybridge(i32)
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// CHECK: ret i32 1
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// CHECK: define i32 @_ZN2ns3fooEi(i32)
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// CHECK: ret i32 2
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// CHECK: define i32 @_Z3barv()
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// CHECK: call i32 @_Z3fooi.ifunc(i32 1)
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// CHECK: call i32 @_ZN2ns3fooEi.ifunc(i32 2)
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2018-01-17 03:49:52 +08:00
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// CHECK: define i32 (i32)* @_Z3fooi.resolver() comdat
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Implement Attribute Target MultiVersioning
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.
llvm-svn: 322028
2018-01-09 05:34:17 +08:00
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// CHECK: ret i32 (i32)* @_Z3fooi.arch_sandybridge
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// CHECK: ret i32 (i32)* @_Z3fooi.arch_ivybridge
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// CHECK: ret i32 (i32)* @_Z3fooi.sse4.2
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// CHECK: ret i32 (i32)* @_Z3fooi
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//
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2018-01-17 03:49:52 +08:00
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// CHECK: define i32 (i32)* @_ZN2ns3fooEi.resolver() comdat
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Implement Attribute Target MultiVersioning
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.
llvm-svn: 322028
2018-01-09 05:34:17 +08:00
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// CHECK: ret i32 (i32)* @_ZN2ns3fooEi.arch_sandybridge
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// CHECK: ret i32 (i32)* @_ZN2ns3fooEi.arch_ivybridge
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// CHECK: ret i32 (i32)* @_ZN2ns3fooEi.sse4.2
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// CHECK: ret i32 (i32)* @_ZN2ns3fooEi
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// CHECK: declare i32 @_Z3fooi.arch_sandybridge(i32)
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// CHECK: declare i32 @_ZN2ns3fooEi.arch_sandybridge(i32)
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