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teak-llvm/clang/test/CodeGen/attr-cpuspecific.c
Fangrui Song 9ca1b94a6d [CodeGen] Add alias for cpu_dispatch function with IFunc & Fix resolver linkage type 
Multi-versioned functions defined by cpu_dispatch and implemented with IFunc
can not be called outside the translation units where they are defined due to
lack of symbols. This patch add function aliases for these functions and thus
make them visible outside.

Differential Revision: https://reviews.llvm.org/D67058
Patch by Senran Zhang

llvm-svn: 371586
2019-09-11 01:54:48 +00:00

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// RUN: %clang_cc1 -triple x86_64-linux-gnu -emit-llvm -o - %s | FileCheck %s --check-prefixes=CHECK,LINUX
// RUN: %clang_cc1 -triple x86_64-windows-pc -fms-compatibility -emit-llvm -o - %s | FileCheck %s --check-prefixes=CHECK,WINDOWS
#ifdef _WIN64
#define ATTR(X) __declspec(X)
#else
#define ATTR(X) __attribute__((X))
#endif // _MSC_VER
// Each version should have an IFunc and an alias.
// LINUX: @TwoVersions = weak_odr alias void (), void ()* @TwoVersions.ifunc
// LINUX: @TwoVersionsSameAttr = weak_odr alias void (), void ()* @TwoVersionsSameAttr.ifunc
// LINUX: @ThreeVersionsSameAttr = weak_odr alias void (), void ()* @ThreeVersionsSameAttr.ifunc
// LINUX: @NoSpecifics = weak_odr alias void (), void ()* @NoSpecifics.ifunc
// LINUX: @HasGeneric = weak_odr alias void (), void ()* @HasGeneric.ifunc
// LINUX: @HasParams = weak_odr alias void (i32, double), void (i32, double)* @HasParams.ifunc
// LINUX: @HasParamsAndReturn = weak_odr alias i32 (i32, double), i32 (i32, double)* @HasParamsAndReturn.ifunc
// LINUX: @GenericAndPentium = weak_odr alias i32 (i32, double), i32 (i32, double)* @GenericAndPentium.ifunc
// LINUX: @DispatchFirst = weak_odr alias i32 (), i32 ()* @DispatchFirst.ifunc
// LINUX: @TwoVersions.ifunc = weak_odr ifunc void (), void ()* ()* @TwoVersions.resolver
// LINUX: @SingleVersion.ifunc = weak_odr ifunc void (), void ()* ()* @SingleVersion.resolver
// LINUX: @TwoVersionsSameAttr.ifunc = weak_odr ifunc void (), void ()* ()* @TwoVersionsSameAttr.resolver
// LINUX: @ThreeVersionsSameAttr.ifunc = weak_odr ifunc void (), void ()* ()* @ThreeVersionsSameAttr.resolver
// LINUX: @NoSpecifics.ifunc = weak_odr ifunc void (), void ()* ()* @NoSpecifics.resolver
// LINUX: @HasGeneric.ifunc = weak_odr ifunc void (), void ()* ()* @HasGeneric.resolver
// LINUX: @HasParams.ifunc = weak_odr ifunc void (i32, double), void (i32, double)* ()* @HasParams.resolver
// LINUX: @HasParamsAndReturn.ifunc = weak_odr ifunc i32 (i32, double), i32 (i32, double)* ()* @HasParamsAndReturn.resolver
// LINUX: @GenericAndPentium.ifunc = weak_odr ifunc i32 (i32, double), i32 (i32, double)* ()* @GenericAndPentium.resolver
// LINUX: @DispatchFirst.ifunc = weak_odr ifunc i32 (), i32 ()* ()* @DispatchFirst.resolver
ATTR(cpu_specific(ivybridge))
void SingleVersion(void){}
// LINUX: define void @SingleVersion.S() #[[S:[0-9]+]]
// WINDOWS: define dso_local void @SingleVersion.S() #[[S:[0-9]+]]
ATTR(cpu_specific(ivybridge))
void NotCalled(void){}
// LINUX: define void @NotCalled.S() #[[S]]
// WINDOWS: define dso_local void @NotCalled.S() #[[S:[0-9]+]]
// Done before any of the implementations. Also has an undecorated forward
// declaration.
void TwoVersions(void);
ATTR(cpu_dispatch(ivybridge, knl))
void TwoVersions(void);
// LINUX: define weak_odr void ()* @TwoVersions.resolver()
// LINUX: call void @__cpu_indicator_init
// LINUX: ret void ()* @TwoVersions.Z
// LINUX: ret void ()* @TwoVersions.S
// LINUX: call void @llvm.trap
// LINUX: unreachable
// WINDOWS: define weak_odr dso_local void @TwoVersions() comdat
// WINDOWS: call void @__cpu_indicator_init()
// WINDOWS: call void @TwoVersions.Z()
// WINDOWS-NEXT: ret void
// WINDOWS: call void @TwoVersions.S()
// WINDOWS-NEXT: ret void
// WINDOWS: call void @llvm.trap
// WINDOWS: unreachable
ATTR(cpu_specific(ivybridge))
void TwoVersions(void){}
// CHECK: define {{.*}}void @TwoVersions.S() #[[S]]
ATTR(cpu_specific(knl))
void TwoVersions(void){}
// CHECK: define {{.*}}void @TwoVersions.Z() #[[K:[0-9]+]]
ATTR(cpu_specific(ivybridge, knl))
void TwoVersionsSameAttr(void){}
// CHECK: define {{.*}}void @TwoVersionsSameAttr.S() #[[S]]
// CHECK: define {{.*}}void @TwoVersionsSameAttr.Z() #[[K]]
ATTR(cpu_specific(atom, ivybridge, knl))
void ThreeVersionsSameAttr(void){}
// CHECK: define {{.*}}void @ThreeVersionsSameAttr.O() #[[O:[0-9]+]]
// CHECK: define {{.*}}void @ThreeVersionsSameAttr.S() #[[S]]
// CHECK: define {{.*}}void @ThreeVersionsSameAttr.Z() #[[K]]
void usages() {
SingleVersion();
// LINUX: @SingleVersion.ifunc()
// WINDOWS: @SingleVersion()
TwoVersions();
// LINUX: @TwoVersions.ifunc()
// WINDOWS: @TwoVersions()
TwoVersionsSameAttr();
// LINUX: @TwoVersionsSameAttr.ifunc()
// WINDOWS: @TwoVersionsSameAttr()
ThreeVersionsSameAttr();
// LINUX: @ThreeVersionsSameAttr.ifunc()
// WINDOWS: @ThreeVersionsSameAttr()
}
// has an extra config to emit!
ATTR(cpu_dispatch(ivybridge, knl, atom))
void TwoVersionsSameAttr(void);
// LINUX: define weak_odr void ()* @TwoVersionsSameAttr.resolver()
// LINUX: ret void ()* @TwoVersionsSameAttr.Z
// LINUX: ret void ()* @TwoVersionsSameAttr.S
// LINUX: ret void ()* @TwoVersionsSameAttr.O
// LINUX: call void @llvm.trap
// LINUX: unreachable
// WINDOWS: define weak_odr dso_local void @TwoVersionsSameAttr() comdat
// WINDOWS: call void @TwoVersionsSameAttr.Z
// WINDOWS-NEXT: ret void
// WINDOWS: call void @TwoVersionsSameAttr.S
// WINDOWS-NEXT: ret void
// WINDOWS: call void @TwoVersionsSameAttr.O
// WINDOWS-NEXT: ret void
// WINDOWS: call void @llvm.trap
// WINDOWS: unreachable
ATTR(cpu_dispatch(atom, ivybridge, knl))
void ThreeVersionsSameAttr(void){}
// LINUX: define weak_odr void ()* @ThreeVersionsSameAttr.resolver()
// LINUX: call void @__cpu_indicator_init
// LINUX: ret void ()* @ThreeVersionsSameAttr.Z
// LINUX: ret void ()* @ThreeVersionsSameAttr.S
// LINUX: ret void ()* @ThreeVersionsSameAttr.O
// LINUX: call void @llvm.trap
// LINUX: unreachable
// WINDOWS: define weak_odr dso_local void @ThreeVersionsSameAttr() comdat
// WINDOWS: call void @__cpu_indicator_init
// WINDOWS: call void @ThreeVersionsSameAttr.Z
// WINDOWS-NEXT: ret void
// WINDOWS: call void @ThreeVersionsSameAttr.S
// WINDOWS-NEXT: ret void
// WINDOWS: call void @ThreeVersionsSameAttr.O
// WINDOWS-NEXT: ret void
// WINDOWS: call void @llvm.trap
// WINDOWS: unreachable
// No Cpu Specific options.
ATTR(cpu_dispatch(atom, ivybridge, knl))
void NoSpecifics(void);
// LINUX: define weak_odr void ()* @NoSpecifics.resolver()
// LINUX: call void @__cpu_indicator_init
// LINUX: ret void ()* @NoSpecifics.Z
// LINUX: ret void ()* @NoSpecifics.S
// LINUX: ret void ()* @NoSpecifics.O
// LINUX: call void @llvm.trap
// LINUX: unreachable
// WINDOWS: define weak_odr dso_local void @NoSpecifics() comdat
// WINDOWS: call void @__cpu_indicator_init
// WINDOWS: call void @NoSpecifics.Z
// WINDOWS-NEXT: ret void
// WINDOWS: call void @NoSpecifics.S
// WINDOWS-NEXT: ret void
// WINDOWS: call void @NoSpecifics.O
// WINDOWS-NEXT: ret void
// WINDOWS: call void @llvm.trap
// WINDOWS: unreachable
ATTR(cpu_dispatch(atom, generic, ivybridge, knl))
void HasGeneric(void);
// LINUX: define weak_odr void ()* @HasGeneric.resolver()
// LINUX: call void @__cpu_indicator_init
// LINUX: ret void ()* @HasGeneric.Z
// LINUX: ret void ()* @HasGeneric.S
// LINUX: ret void ()* @HasGeneric.O
// LINUX: ret void ()* @HasGeneric.A
// LINUX-NOT: call void @llvm.trap
// WINDOWS: define weak_odr dso_local void @HasGeneric() comdat
// WINDOWS: call void @__cpu_indicator_init
// WINDOWS: call void @HasGeneric.Z
// WINDOWS-NEXT: ret void
// WINDOWS: call void @HasGeneric.S
// WINDOWS-NEXT: ret void
// WINDOWS: call void @HasGeneric.O
// WINDOWS-NEXT: ret void
// WINDOWS: call void @HasGeneric.A
// WINDOWS-NEXT: ret void
// WINDOWS-NOT: call void @llvm.trap
ATTR(cpu_dispatch(atom, generic, ivybridge, knl))
void HasParams(int i, double d);
// LINUX: define weak_odr void (i32, double)* @HasParams.resolver()
// LINUX: call void @__cpu_indicator_init
// LINUX: ret void (i32, double)* @HasParams.Z
// LINUX: ret void (i32, double)* @HasParams.S
// LINUX: ret void (i32, double)* @HasParams.O
// LINUX: ret void (i32, double)* @HasParams.A
// LINUX-NOT: call void @llvm.trap
// WINDOWS: define weak_odr dso_local void @HasParams(i32 %0, double %1) comdat
// WINDOWS: call void @__cpu_indicator_init
// WINDOWS: call void @HasParams.Z(i32 %0, double %1)
// WINDOWS-NEXT: ret void
// WINDOWS: call void @HasParams.S(i32 %0, double %1)
// WINDOWS-NEXT: ret void
// WINDOWS: call void @HasParams.O(i32 %0, double %1)
// WINDOWS-NEXT: ret void
// WINDOWS: call void @HasParams.A(i32 %0, double %1)
// WINDOWS-NEXT: ret void
// WINDOWS-NOT: call void @llvm.trap
ATTR(cpu_dispatch(atom, generic, ivybridge, knl))
int HasParamsAndReturn(int i, double d);
// LINUX: define weak_odr i32 (i32, double)* @HasParamsAndReturn.resolver()
// LINUX: call void @__cpu_indicator_init
// LINUX: ret i32 (i32, double)* @HasParamsAndReturn.Z
// LINUX: ret i32 (i32, double)* @HasParamsAndReturn.S
// LINUX: ret i32 (i32, double)* @HasParamsAndReturn.O
// LINUX: ret i32 (i32, double)* @HasParamsAndReturn.A
// LINUX-NOT: call void @llvm.trap
// WINDOWS: define weak_odr dso_local i32 @HasParamsAndReturn(i32 %0, double %1) comdat
// WINDOWS: call void @__cpu_indicator_init
// WINDOWS: %[[RET:.+]] = musttail call i32 @HasParamsAndReturn.Z(i32 %0, double %1)
// WINDOWS-NEXT: ret i32 %[[RET]]
// WINDOWS: %[[RET:.+]] = musttail call i32 @HasParamsAndReturn.S(i32 %0, double %1)
// WINDOWS-NEXT: ret i32 %[[RET]]
// WINDOWS: %[[RET:.+]] = musttail call i32 @HasParamsAndReturn.O(i32 %0, double %1)
// WINDOWS-NEXT: ret i32 %[[RET]]
// WINDOWS: %[[RET:.+]] = musttail call i32 @HasParamsAndReturn.A(i32 %0, double %1)
// WINDOWS-NEXT: ret i32 %[[RET]]
// WINDOWS-NOT: call void @llvm.trap
ATTR(cpu_dispatch(atom, generic, pentium))
int GenericAndPentium(int i, double d);
// LINUX: define weak_odr i32 (i32, double)* @GenericAndPentium.resolver()
// LINUX: call void @__cpu_indicator_init
// LINUX: ret i32 (i32, double)* @GenericAndPentium.O
// LINUX: ret i32 (i32, double)* @GenericAndPentium.B
// LINUX-NOT: ret i32 (i32, double)* @GenericAndPentium.A
// LINUX-NOT: call void @llvm.trap
// WINDOWS: define weak_odr dso_local i32 @GenericAndPentium(i32 %0, double %1) comdat
// WINDOWS: call void @__cpu_indicator_init
// WINDOWS: %[[RET:.+]] = musttail call i32 @GenericAndPentium.O(i32 %0, double %1)
// WINDOWS-NEXT: ret i32 %[[RET]]
// WINDOWS: %[[RET:.+]] = musttail call i32 @GenericAndPentium.B(i32 %0, double %1)
// WINDOWS-NEXT: ret i32 %[[RET]]
// WINDOWS-NOT: call i32 @GenericAndPentium.A
// WINDOWS-NOT: call void @llvm.trap
ATTR(cpu_dispatch(atom, pentium))
int DispatchFirst(void);
// LINUX: define weak_odr i32 ()* @DispatchFirst.resolver
// LINUX: ret i32 ()* @DispatchFirst.O
// LINUX: ret i32 ()* @DispatchFirst.B
// WINDOWS: define weak_odr dso_local i32 @DispatchFirst() comdat
// WINDOWS: %[[RET:.+]] = musttail call i32 @DispatchFirst.O()
// WINDOWS-NEXT: ret i32 %[[RET]]
// WINDOWS: %[[RET:.+]] = musttail call i32 @DispatchFirst.B()
// WINDOWS-NEXT: ret i32 %[[RET]]
ATTR(cpu_specific(atom))
int DispatchFirst(void) {return 0;}
// LINUX: define i32 @DispatchFirst.O
// LINUX: ret i32 0
// WINDOWS: define dso_local i32 @DispatchFirst.O()
// WINDOWS: ret i32 0
ATTR(cpu_specific(pentium))
int DispatchFirst(void) {return 1;}
// LINUX: define i32 @DispatchFirst.B
// LINUX: ret i32 1
// WINDOWS: define dso_local i32 @DispatchFirst.B
// WINDOWS: ret i32 1
// CHECK: attributes #[[S]] = {{.*}}"target-features"="+avx,+cmov,+cx8,+f16c,+mmx,+popcnt,+sse,+sse2,+sse3,+sse4.1,+sse4.2,+ssse3,+x87,+xsave"
// CHECK: attributes #[[K]] = {{.*}}"target-features"="+adx,+avx,+avx2,+avx512cd,+avx512er,+avx512f,+avx512pf,+bmi,+cmov,+cx8,+f16c,+fma,+lzcnt,+mmx,+movbe,+popcnt,+sse,+sse2,+sse3,+sse4.1,+sse4.2,+ssse3,+x87,+xsave"
// CHECK: attributes #[[O]] = {{.*}}"target-features"="+cmov,+cx8,+mmx,+movbe,+sse,+sse2,+sse3,+ssse3,+x87"
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