2018-10-26 02:57:19 +08:00
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// RUN: %clang_cc1 -std=c++11 -triple x86_64-linux-gnu -emit-llvm %s -o - | FileCheck %s --check-prefix=LINUX
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// RUN: %clang_cc1 -std=c++11 -triple x86_64-windows-pc -emit-llvm %s -o - | FileCheck %s --check-prefix=WINDOWS
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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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int __attribute__((target("sse4.2"))) foo_overload(int) { return 0; }
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int __attribute__((target("arch=sandybridge"))) foo_overload(int);
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int __attribute__((target("arch=ivybridge"))) foo_overload(int) {return 1;}
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int __attribute__((target("default"))) foo_overload(int) { return 2; }
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int __attribute__((target("sse4.2"))) foo_overload(void) { return 0; }
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int __attribute__((target("arch=sandybridge"))) foo_overload(void);
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int __attribute__((target("arch=ivybridge"))) foo_overload(void) {return 1;}
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int __attribute__((target("default"))) foo_overload(void) { return 2; }
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int bar2() {
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return foo_overload() + foo_overload(1);
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}
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2019-09-11 09:54:48 +08:00
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// LINUX: @_Z12foo_overloadv.ifunc = weak_odr ifunc i32 (), i32 ()* ()* @_Z12foo_overloadv.resolver
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// LINUX: @_Z12foo_overloadi.ifunc = weak_odr ifunc i32 (i32), i32 (i32)* ()* @_Z12foo_overloadi.resolver
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2018-10-26 02:57:19 +08:00
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2022-01-16 17:53:11 +08:00
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// LINUX: define{{.*}} i32 @_Z12foo_overloadi.sse4.2(i32 noundef %0)
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2018-10-26 02:57:19 +08:00
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// LINUX: ret i32 0
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2022-01-16 17:53:11 +08:00
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// LINUX: define{{.*}} i32 @_Z12foo_overloadi.arch_ivybridge(i32 noundef %0)
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2018-10-26 02:57:19 +08:00
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// LINUX: ret i32 1
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2022-01-16 17:53:11 +08:00
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// LINUX: define{{.*}} i32 @_Z12foo_overloadi(i32 noundef %0)
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2018-10-26 02:57:19 +08:00
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// LINUX: ret i32 2
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2020-12-31 16:27:11 +08:00
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// LINUX: define{{.*}} i32 @_Z12foo_overloadv.sse4.2()
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2018-10-26 02:57:19 +08:00
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// LINUX: ret i32 0
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2020-12-31 16:27:11 +08:00
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// LINUX: define{{.*}} i32 @_Z12foo_overloadv.arch_ivybridge()
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2018-10-26 02:57:19 +08:00
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// LINUX: ret i32 1
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2020-12-31 16:27:11 +08:00
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// LINUX: define{{.*}} i32 @_Z12foo_overloadv()
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2018-10-26 02:57:19 +08:00
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// LINUX: ret i32 2
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2022-01-16 17:53:11 +08:00
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// WINDOWS: define dso_local noundef i32 @"?foo_overload@@YAHH@Z.sse4.2"(i32 noundef %0)
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2018-10-26 02:57:19 +08:00
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// WINDOWS: ret i32 0
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2022-01-16 17:53:11 +08:00
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// WINDOWS: define dso_local noundef i32 @"?foo_overload@@YAHH@Z.arch_ivybridge"(i32 noundef %0)
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2018-10-26 02:57:19 +08:00
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// WINDOWS: ret i32 1
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2022-01-16 17:53:11 +08:00
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// WINDOWS: define dso_local noundef i32 @"?foo_overload@@YAHH@Z"(i32 noundef %0)
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2018-10-26 02:57:19 +08:00
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// WINDOWS: ret i32 2
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2022-01-16 17:53:11 +08:00
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// WINDOWS: define dso_local noundef i32 @"?foo_overload@@YAHXZ.sse4.2"()
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2018-10-26 02:57:19 +08:00
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// WINDOWS: ret i32 0
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2022-01-16 17:53:11 +08:00
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// WINDOWS: define dso_local noundef i32 @"?foo_overload@@YAHXZ.arch_ivybridge"()
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2018-10-26 02:57:19 +08:00
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// WINDOWS: ret i32 1
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2022-01-16 17:53:11 +08:00
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// WINDOWS: define dso_local noundef i32 @"?foo_overload@@YAHXZ"()
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2018-10-26 02:57:19 +08:00
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// WINDOWS: ret i32 2
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2020-12-31 16:27:11 +08:00
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// LINUX: define{{.*}} i32 @_Z4bar2v()
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2022-01-16 17:53:11 +08:00
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// LINUX: call noundef i32 @_Z12foo_overloadv.ifunc()
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// LINUX: call noundef i32 @_Z12foo_overloadi.ifunc(i32 noundef 1)
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2018-10-26 02:57:19 +08:00
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2022-01-16 17:53:11 +08:00
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// WINDOWS: define dso_local noundef i32 @"?bar2@@YAHXZ"()
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// WINDOWS: call noundef i32 @"?foo_overload@@YAHXZ.resolver"()
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// WINDOWS: call noundef i32 @"?foo_overload@@YAHH@Z.resolver"(i32 noundef 1)
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2018-10-26 02:57:19 +08:00
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2019-09-11 09:54:48 +08:00
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// LINUX: define weak_odr i32 ()* @_Z12foo_overloadv.resolver() comdat
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2018-10-26 02:57:19 +08:00
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// LINUX: ret i32 ()* @_Z12foo_overloadv.arch_sandybridge
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// LINUX: ret i32 ()* @_Z12foo_overloadv.arch_ivybridge
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// LINUX: ret i32 ()* @_Z12foo_overloadv.sse4.2
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// LINUX: ret i32 ()* @_Z12foo_overloadv
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2019-09-11 09:54:48 +08:00
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// WINDOWS: define weak_odr dso_local i32 @"?foo_overload@@YAHXZ.resolver"() comdat
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2018-10-26 02:57:19 +08:00
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// WINDOWS: call i32 @"?foo_overload@@YAHXZ.arch_sandybridge"
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// WINDOWS: call i32 @"?foo_overload@@YAHXZ.arch_ivybridge"
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// WINDOWS: call i32 @"?foo_overload@@YAHXZ.sse4.2"
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// WINDOWS: call i32 @"?foo_overload@@YAHXZ"
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2019-09-11 09:54:48 +08:00
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// LINUX: define weak_odr i32 (i32)* @_Z12foo_overloadi.resolver() comdat
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2018-10-26 02:57:19 +08:00
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// LINUX: ret i32 (i32)* @_Z12foo_overloadi.arch_sandybridge
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// LINUX: ret i32 (i32)* @_Z12foo_overloadi.arch_ivybridge
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// LINUX: ret i32 (i32)* @_Z12foo_overloadi.sse4.2
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// LINUX: ret i32 (i32)* @_Z12foo_overloadi
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2019-09-11 09:54:48 +08:00
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// WINDOWS: define weak_odr dso_local i32 @"?foo_overload@@YAHH@Z.resolver"(i32 %0) comdat
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2018-10-26 02:57:19 +08:00
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// WINDOWS: call i32 @"?foo_overload@@YAHH@Z.arch_sandybridge"
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// WINDOWS: call i32 @"?foo_overload@@YAHH@Z.arch_ivybridge"
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// WINDOWS: call i32 @"?foo_overload@@YAHH@Z.sse4.2"
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// WINDOWS: call i32 @"?foo_overload@@YAHH@Z"
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2022-01-16 17:53:11 +08:00
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// LINUX: declare noundef i32 @_Z12foo_overloadv.arch_sandybridge()
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// LINUX: declare noundef i32 @_Z12foo_overloadi.arch_sandybridge(i32 noundef)
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2018-10-26 02:57:19 +08:00
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2022-01-16 17:53:11 +08:00
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// WINDOWS: declare dso_local noundef i32 @"?foo_overload@@YAHXZ.arch_sandybridge"()
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// WINDOWS: declare dso_local noundef i32 @"?foo_overload@@YAHH@Z.arch_sandybridge"(i32 noundef)
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