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.
102 lines
3.6 KiB
C++
102 lines
3.6 KiB
C++
// RUN: %clang_cc1 -fno-rtti -emit-llvm -triple=i386-pc-win32 %s -o - | FileCheck %s
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// In each test case, we have two member pointers whose thunks have the same
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// vtable offset and same mangling, but their prototypes conflict. The
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// arguments and return type may differ. Therefore, we have to bitcast the
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// function prototype. Unfortunately, if the return types differ, LLVM's
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// optimizers can get upset.
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namespace num_params {
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struct A { virtual void a(int); };
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struct B { virtual void b(int, int); };
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struct C : A, B {
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virtual void a(int);
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virtual void b(int, int);
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};
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void f(C *c) {
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(c->*(&C::a))(0);
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(c->*(&C::b))(0, 0);
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}
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}
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// CHECK-LABEL: define dso_local void @"?f@num_params@@YAXPAUC@1@@Z"(ptr noundef %c)
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// CHECK: call x86_thiscallcc void @"??_9C@num_params@@$BA@AE"(ptr {{[^,]*}} %{{.*}}, i32 noundef 0)
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// CHECK: call x86_thiscallcc void @"??_9C@num_params@@$BA@AE"(ptr {{[^,]*}} %{{.*}}, i32 noundef 0, i32 noundef 0)
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// CHECK-LABEL: define linkonce_odr x86_thiscallcc void @"??_9C@num_params@@$BA@AE"(ptr noundef %this, ...) {{.*}} comdat
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// CHECK: musttail call x86_thiscallcc void (ptr, ...) %{{.*}}(ptr noundef %{{.*}}, ...)
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// CHECK-NEXT: ret void
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namespace i64_return {
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struct A { virtual int a(); };
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struct B { virtual long long b(); };
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struct C : A, B {
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virtual int a();
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virtual long long b();
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};
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long long f(C *c) {
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int x = (c->*(&C::a))();
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long long y = (c->*(&C::b))();
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return x + y;
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}
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}
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// CHECK-LABEL: define dso_local noundef i64 @"?f@i64_return@@YA_JPAUC@1@@Z"(ptr noundef %c)
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// CHECK: call x86_thiscallcc noundef i32 @"??_9C@i64_return@@$BA@AE"(ptr {{[^,]*}} %{{.*}})
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// CHECK: call x86_thiscallcc noundef i64 @"??_9C@i64_return@@$BA@AE"(ptr {{[^,]*}} %{{.*}})
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// CHECK-LABEL: define linkonce_odr x86_thiscallcc void @"??_9C@i64_return@@$BA@AE"(ptr noundef %this, ...) {{.*}} comdat
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// CHECK: musttail call x86_thiscallcc void (ptr, ...) %{{.*}}(ptr noundef %{{.*}}, ...)
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// CHECK-NEXT: ret void
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namespace sret {
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struct Big { int big[32]; };
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struct A { virtual int a(); };
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struct B { virtual Big b(); };
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struct C : A, B {
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virtual int a();
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virtual Big b();
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};
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void f(C *c) {
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(c->*(&C::a))();
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Big b((c->*(&C::b))());
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}
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}
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// CHECK-LABEL: define dso_local void @"?f@sret@@YAXPAUC@1@@Z"(ptr noundef %c)
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// CHECK: call x86_thiscallcc noundef i32 @"??_9C@sret@@$BA@AE"(ptr {{[^,]*}} %{{.*}})
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// CHECK: call x86_thiscallcc void @"??_9C@sret@@$BA@AE"(ptr {{[^,]*}} %{{.*}}, ptr dead_on_unwind writable sret(%"struct.sret::Big") align 4 %{{.*}})
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// CHECK-LABEL: define linkonce_odr x86_thiscallcc void @"??_9C@sret@@$BA@AE"(ptr noundef %this, ...) {{.*}} comdat
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// CHECK: musttail call x86_thiscallcc void (ptr, ...) %{{.*}}(ptr noundef %{{.*}}, ...)
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// CHECK-NEXT: ret void
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namespace cdecl_inalloca {
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// Fairly evil, since now we end up doing an inalloca-style call through a
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// thunk that doesn't use inalloca. Hopefully the stacks line up?
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struct Big {
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Big();
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~Big();
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int big[32];
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};
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struct A { virtual void __cdecl a(); };
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struct B { virtual void __cdecl b(Big); };
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struct C : A, B {
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virtual void __cdecl a();
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virtual void __cdecl b(Big);
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};
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void f(C *c) {
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Big b;
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(c->*(&C::a))();
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((c->*(&C::b))(b));
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}
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}
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// CHECK-LABEL: define dso_local void @"?f@cdecl_inalloca@@YAXPAUC@1@@Z"(ptr noundef %c)
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// CHECK: call void @"??_9C@cdecl_inalloca@@$BA@AA"(ptr {{[^,]*}} %{{.*}})
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// CHECK: call void @"??_9C@cdecl_inalloca@@$BA@AA"(ptr inalloca(<{ ptr, %"struct.cdecl_inalloca::Big" }>) %{{.*}})
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// CHECK-LABEL: define linkonce_odr void @"??_9C@cdecl_inalloca@@$BA@AA"(ptr noundef %this, ...) {{.*}} comdat
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// CHECK: musttail call void (ptr, ...) %{{.*}}(ptr noundef %{{.*}}, ...)
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// CHECK-NEXT: ret void
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