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 -triple x86_64-linux-gnu -emit-llvm %s -o - | FileCheck %s
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int __attribute__((target("sse4.2"))) foo(void) { return 0; }
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int __attribute__((target("arch=sandybridge"))) foo(void);
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int __attribute__((target("arch=ivybridge"))) foo(void) {return 1;}
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int __attribute__((target("default"))) foo(void) { return 2; }
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int bar() {
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return foo();
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}
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inline int __attribute__((target("sse4.2"))) foo_inline(void) { return 0; }
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inline int __attribute__((target("arch=sandybridge"))) foo_inline(void);
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inline int __attribute__((target("arch=ivybridge"))) foo_inline(void) {return 1;}
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inline int __attribute__((target("default"))) foo_inline(void) { return 2; }
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int bar2() {
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return foo_inline();
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}
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inline __attribute__((target("default"))) void foo_decls(void);
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inline __attribute__((target("sse4.2"))) void foo_decls(void);
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void bar3() {
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foo_decls();
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}
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inline __attribute__((target("default"))) void foo_decls(void) {}
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inline __attribute__((target("sse4.2"))) void foo_decls(void) {}
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2018-01-17 12:46:04 +08:00
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inline __attribute__((target("default"))) void foo_multi(void) {}
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inline __attribute__((target("avx,sse4.2"))) void foo_multi(void) {}
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inline __attribute__((target("sse4.2,fma4"))) void foo_multi(void) {}
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inline __attribute__((target("arch=ivybridge,fma4,sse4.2"))) void foo_multi(void) {}
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void bar4() {
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foo_multi();
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}
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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: @foo.ifunc = ifunc i32 (), i32 ()* ()* @foo.resolver
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// CHECK: @foo_inline.ifunc = ifunc i32 (), i32 ()* ()* @foo_inline.resolver
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// CHECK: @foo_decls.ifunc = ifunc void (), void ()* ()* @foo_decls.resolver
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// CHECK: define i32 @foo.sse4.2()
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// CHECK: ret i32 0
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// CHECK: define i32 @foo.arch_ivybridge()
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// CHECK: ret i32 1
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// CHECK: define i32 @foo()
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// CHECK: ret i32 2
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// CHECK: define i32 @bar()
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// CHECK: call i32 @foo.ifunc()
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2018-01-17 03:49:52 +08:00
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// CHECK: define i32 ()* @foo.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: call void @__cpu_indicator_init()
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// CHECK: ret i32 ()* @foo.arch_sandybridge
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// CHECK: ret i32 ()* @foo.arch_ivybridge
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// CHECK: ret i32 ()* @foo.sse4.2
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// CHECK: ret i32 ()* @foo
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// CHECK: define i32 @bar2()
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// CHECK: call i32 @foo_inline.ifunc()
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2018-01-17 03:49:52 +08:00
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// CHECK: define i32 ()* @foo_inline.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: call void @__cpu_indicator_init()
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// CHECK: ret i32 ()* @foo_inline.arch_sandybridge
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// CHECK: ret i32 ()* @foo_inline.arch_ivybridge
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// CHECK: ret i32 ()* @foo_inline.sse4.2
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// CHECK: ret i32 ()* @foo_inline
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// CHECK: define void @bar3()
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// CHECK: call void @foo_decls.ifunc()
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2018-01-17 03:49:52 +08:00
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// CHECK: define void ()* @foo_decls.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 void ()* @foo_decls.sse4.2
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// CHECK: ret void ()* @foo_decls
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// CHECK: declare i32 @foo.arch_sandybridge()
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// CHECK: define available_externally i32 @foo_inline.sse4.2()
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// CHECK: ret i32 0
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// CHECK: declare i32 @foo_inline.arch_sandybridge()
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//
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// CHECK: define available_externally i32 @foo_inline.arch_ivybridge()
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// CHECK: ret i32 1
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// CHECK: define available_externally i32 @foo_inline()
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// CHECK: ret i32 2
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// CHECK: define available_externally void @foo_decls()
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// CHECK: define available_externally void @foo_decls.sse4.2()
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2018-01-17 12:46:04 +08:00
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// CHECK: define available_externally void @foo_multi.avx_sse4.2()
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// CHECK: define available_externally void @foo_multi.fma4_sse4.2()
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// CHECK: define available_externally void @foo_multi.arch_ivybridge_fma4_sse4.2()
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