158d72d728
Set the writable and dead_on_unwind attributes for sret arguments. These indicate that the argument points to writable memory (and it's legal to introduce spurious writes to it on entry to the function) and that the argument memory will not be used if the call unwinds. This enables additional MemCpyOpt/DSE/LICM optimizations.
114 lines
4.3 KiB
C++
114 lines
4.3 KiB
C++
// RUN: %clang_cc1 %s -fno-rtti -triple=i686-pc-win32 -emit-llvm -o - | FileCheck --check-prefix=CHECK32 %s
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// RUN: %clang_cc1 %s -fno-rtti -triple=x86_64-pc-win32 -emit-llvm -o - | FileCheck --check-prefix=CHECK64 %s
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namespace byval_thunk {
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struct Agg {
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Agg();
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Agg(const Agg &);
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~Agg();
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int x;
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};
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struct A { virtual void foo(Agg x); };
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struct B { virtual void foo(Agg x); };
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struct C : A, B { C(); virtual void foo(Agg x); };
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C::C() {} // force emission
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// CHECK32-LABEL: define linkonce_odr dso_local x86_thiscallcc void @"?foo@C@byval_thunk@@W3AEXUAgg@2@@Z"
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// CHECK32: (ptr noundef %this, ptr inalloca(<{ %"struct.byval_thunk::Agg" }>) %0)
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// CHECK32: getelementptr i8, ptr %{{.*}}, i32 -4
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// CHECK32: musttail call x86_thiscallcc void @"?foo@C@byval_thunk@@UAEXUAgg@2@@Z"
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// CHECK32: (ptr noundef %{{.*}}, ptr inalloca(<{ %"struct.byval_thunk::Agg" }>) %0)
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// CHECK32-NEXT: ret void
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// CHECK64-LABEL: define linkonce_odr dso_local void @"?foo@C@byval_thunk@@W7EAAXUAgg@2@@Z"
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// CHECK64: (ptr noundef %this, ptr noundef %x)
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// CHECK64: getelementptr i8, ptr %{{.*}}, i32 -8
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// CHECK64: call void @"?foo@C@byval_thunk@@UEAAXUAgg@2@@Z"
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// CHECK64: (ptr {{[^,]*}} %{{.*}}, ptr noundef %x)
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// CHECK64-NOT: call
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// CHECK64: ret void
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}
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namespace stdcall_thunk {
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struct Agg {
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Agg();
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Agg(const Agg &);
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~Agg();
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int x;
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};
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struct A { virtual void __stdcall foo(Agg x); };
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struct B { virtual void __stdcall foo(Agg x); };
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struct C : A, B { C(); virtual void __stdcall foo(Agg x); };
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C::C() {} // force emission
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// CHECK32-LABEL: define linkonce_odr dso_local x86_stdcallcc void @"?foo@C@stdcall_thunk@@W3AGXUAgg@2@@Z"
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// CHECK32: (ptr inalloca(<{ ptr, %"struct.stdcall_thunk::Agg" }>) %0)
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// CHECK32: %[[this_slot:[^ ]*]] = getelementptr inbounds <{ ptr, %"struct.stdcall_thunk::Agg" }>, ptr %0, i32 0, i32 0
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// CHECK32: load ptr, ptr %[[this_slot]]
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// CHECK32: getelementptr i8, ptr %{{.*}}, i32 -4
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// CHECK32: store ptr %{{.*}}, ptr %[[this_slot]]
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// CHECK32: musttail call x86_stdcallcc void @"?foo@C@stdcall_thunk@@UAGXUAgg@2@@Z"
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// CHECK32: (ptr inalloca(<{ ptr, %"struct.stdcall_thunk::Agg" }>) %0)
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// CHECK32-NEXT: ret void
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// CHECK64-LABEL: define linkonce_odr dso_local void @"?foo@C@stdcall_thunk@@W7EAAXUAgg@2@@Z"
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// CHECK64: (ptr noundef %this, ptr noundef %x)
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// CHECK64: getelementptr i8, ptr %{{.*}}, i32 -8
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// CHECK64: call void @"?foo@C@stdcall_thunk@@UEAAXUAgg@2@@Z"
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// CHECK64: (ptr {{[^,]*}} %{{.*}}, ptr noundef %x)
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// CHECK64-NOT: call
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// CHECK64: ret void
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}
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namespace sret_thunk {
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struct Agg {
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Agg();
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Agg(const Agg &);
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~Agg();
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int x;
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};
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struct A { virtual Agg __cdecl foo(Agg x); };
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struct B { virtual Agg __cdecl foo(Agg x); };
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struct C : A, B { C(); virtual Agg __cdecl foo(Agg x); };
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C::C() {} // force emission
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// CHECK32-LABEL: define linkonce_odr dso_local ptr @"?foo@C@sret_thunk@@W3AA?AUAgg@2@U32@@Z"
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// CHECK32: (ptr inalloca(<{ ptr, ptr, %"struct.sret_thunk::Agg" }>) %0)
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// CHECK32: %[[this_slot:[^ ]*]] = getelementptr inbounds <{ ptr, ptr, %"struct.sret_thunk::Agg" }>, ptr %0, i32 0, i32 0
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// CHECK32: load ptr, ptr %[[this_slot]]
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// CHECK32: getelementptr i8, ptr %{{.*}}, i32 -4
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// CHECK32: store ptr %{{.*}}, ptr %[[this_slot]]
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// CHECK32: %[[rv:[^ ]*]] = musttail call ptr @"?foo@C@sret_thunk@@UAA?AUAgg@2@U32@@Z"
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// CHECK32: (ptr inalloca(<{ ptr, ptr, %"struct.sret_thunk::Agg" }>) %0)
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// CHECK32-NEXT: ret ptr %[[rv]]
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// CHECK64-LABEL: define linkonce_odr dso_local void @"?foo@C@sret_thunk@@W7EAA?AUAgg@2@U32@@Z"
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// CHECK64: (ptr noundef %this, ptr dead_on_unwind noalias writable sret(%"struct.sret_thunk::Agg") align 4 %agg.result, ptr noundef %x)
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// CHECK64: getelementptr i8, ptr %{{.*}}, i32 -8
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// CHECK64: call void @"?foo@C@sret_thunk@@UEAA?AUAgg@2@U32@@Z"
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// CHECK64: (ptr {{[^,]*}} %{{.*}}, ptr dead_on_unwind writable sret(%"struct.sret_thunk::Agg") align 4 %agg.result, ptr noundef %x)
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// CHECK64-NOT: call
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// CHECK64: ret void
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}
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#if 0
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// FIXME: When we extend LLVM IR to allow forwarding of varargs through musttail
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// calls, use this test.
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namespace variadic_thunk {
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struct Agg {
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Agg();
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Agg(const Agg &);
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~Agg();
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int x;
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};
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struct A { virtual void foo(Agg x, ...); };
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struct B { virtual void foo(Agg x, ...); };
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struct C : A, B { C(); virtual void foo(Agg x, ...); };
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C::C() {} // force emission
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}
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#endif
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