|  | ; RUN: llc < %s -mtriple=i686-win32 | FileCheck %s | 
|  | ; RUN: llc < %s -mtriple=i686-win32 -O0 | FileCheck %s | 
|  |  | 
|  | ; IR simplified from the following C++ snippet compiled for i686-windows-msvc: | 
|  |  | 
|  | ; struct A { A(); ~A(); int a; }; | 
|  | ; | 
|  | ; struct B { | 
|  | ;   virtual int  f(int); | 
|  | ;   virtual int  g(A, int, A); | 
|  | ;   virtual void h(A, int, A); | 
|  | ;   virtual A    i(A, int, A); | 
|  | ;   virtual A    j(int); | 
|  | ; }; | 
|  | ; | 
|  | ; int  (B::*mp_f)(int)       = &B::f; | 
|  | ; int  (B::*mp_g)(A, int, A) = &B::g; | 
|  | ; void (B::*mp_h)(A, int, A) = &B::h; | 
|  | ; A    (B::*mp_i)(A, int, A) = &B::i; | 
|  | ; A    (B::*mp_j)(int)       = &B::j; | 
|  |  | 
|  | ; Each member pointer creates a thunk.  The ones with inalloca are required to | 
|  | ; tail calls by the ABI, even at O0. | 
|  |  | 
|  | %struct.B = type { i32 (...)** } | 
|  | %struct.A = type { i32 } | 
|  |  | 
|  | ; CHECK-LABEL: f_thunk: | 
|  | ; CHECK: jmpl | 
|  | ; CHECK-NOT: ret | 
|  | define x86_thiscallcc i32 @f_thunk(%struct.B* %this, i32) { | 
|  | entry: | 
|  | %1 = bitcast %struct.B* %this to i32 (%struct.B*, i32)*** | 
|  | %vtable = load i32 (%struct.B*, i32)**, i32 (%struct.B*, i32)*** %1 | 
|  | %2 = load i32 (%struct.B*, i32)*, i32 (%struct.B*, i32)** %vtable | 
|  | %3 = musttail call x86_thiscallcc i32 %2(%struct.B* %this, i32 %0) | 
|  | ret i32 %3 | 
|  | } | 
|  |  | 
|  | ; Inalloca thunks shouldn't require any stores to the stack. | 
|  | ; CHECK-LABEL: g_thunk: | 
|  | ; CHECK-NOT: mov %{{.*}}, {{.*(.*esp.*)}} | 
|  | ; CHECK: jmpl | 
|  | ; CHECK-NOT: ret | 
|  | define x86_thiscallcc i32 @g_thunk(%struct.B* %this, <{ %struct.A, i32, %struct.A }>* inalloca) { | 
|  | entry: | 
|  | %1 = bitcast %struct.B* %this to i32 (%struct.B*, <{ %struct.A, i32, %struct.A }>*)*** | 
|  | %vtable = load i32 (%struct.B*, <{ %struct.A, i32, %struct.A }>*)**, i32 (%struct.B*, <{ %struct.A, i32, %struct.A }>*)*** %1 | 
|  | %vfn = getelementptr inbounds i32 (%struct.B*, <{ %struct.A, i32, %struct.A }>*)*, i32 (%struct.B*, <{ %struct.A, i32, %struct.A }>*)** %vtable, i32 1 | 
|  | %2 = load i32 (%struct.B*, <{ %struct.A, i32, %struct.A }>*)*, i32 (%struct.B*, <{ %struct.A, i32, %struct.A }>*)** %vfn | 
|  | %3 = musttail call x86_thiscallcc i32 %2(%struct.B* %this, <{ %struct.A, i32, %struct.A }>* inalloca %0) | 
|  | ret i32 %3 | 
|  | } | 
|  |  | 
|  | ; CHECK-LABEL: h_thunk: | 
|  | ; CHECK: jmpl | 
|  | ; CHECK-NOT: mov %{{.*}}, {{.*(.*esp.*)}} | 
|  | ; CHECK-NOT: ret | 
|  | define x86_thiscallcc void @h_thunk(%struct.B* %this, <{ %struct.A, i32, %struct.A }>* inalloca) { | 
|  | entry: | 
|  | %1 = bitcast %struct.B* %this to void (%struct.B*, <{ %struct.A, i32, %struct.A }>*)*** | 
|  | %vtable = load void (%struct.B*, <{ %struct.A, i32, %struct.A }>*)**, void (%struct.B*, <{ %struct.A, i32, %struct.A }>*)*** %1 | 
|  | %vfn = getelementptr inbounds void (%struct.B*, <{ %struct.A, i32, %struct.A }>*)*, void (%struct.B*, <{ %struct.A, i32, %struct.A }>*)** %vtable, i32 2 | 
|  | %2 = load void (%struct.B*, <{ %struct.A, i32, %struct.A }>*)*, void (%struct.B*, <{ %struct.A, i32, %struct.A }>*)** %vfn | 
|  | musttail call x86_thiscallcc void %2(%struct.B* %this, <{ %struct.A, i32, %struct.A }>* inalloca %0) | 
|  | ret void | 
|  | } | 
|  |  | 
|  | ; CHECK-LABEL: i_thunk: | 
|  | ; CHECK-NOT: mov %{{.*}}, {{.*(.*esp.*)}} | 
|  | ; CHECK: jmpl | 
|  | ; CHECK-NOT: ret | 
|  | define x86_thiscallcc %struct.A* @i_thunk(%struct.B* %this, <{ %struct.A*, %struct.A, i32, %struct.A }>* inalloca) { | 
|  | entry: | 
|  | %1 = bitcast %struct.B* %this to %struct.A* (%struct.B*, <{ %struct.A*, %struct.A, i32, %struct.A }>*)*** | 
|  | %vtable = load %struct.A* (%struct.B*, <{ %struct.A*, %struct.A, i32, %struct.A }>*)**, %struct.A* (%struct.B*, <{ %struct.A*, %struct.A, i32, %struct.A }>*)*** %1 | 
|  | %vfn = getelementptr inbounds %struct.A* (%struct.B*, <{ %struct.A*, %struct.A, i32, %struct.A }>*)*, %struct.A* (%struct.B*, <{ %struct.A*, %struct.A, i32, %struct.A }>*)** %vtable, i32 3 | 
|  | %2 = load %struct.A* (%struct.B*, <{ %struct.A*, %struct.A, i32, %struct.A }>*)*, %struct.A* (%struct.B*, <{ %struct.A*, %struct.A, i32, %struct.A }>*)** %vfn | 
|  | %3 = musttail call x86_thiscallcc %struct.A* %2(%struct.B* %this, <{ %struct.A*, %struct.A, i32, %struct.A }>* inalloca %0) | 
|  | ret %struct.A* %3 | 
|  | } | 
|  |  | 
|  | ; CHECK-LABEL: j_thunk: | 
|  | ; CHECK: jmpl | 
|  | ; CHECK-NOT: ret | 
|  | define x86_thiscallcc void @j_thunk(%struct.A* noalias sret %agg.result, %struct.B* %this, i32) { | 
|  | entry: | 
|  | %1 = bitcast %struct.B* %this to void (%struct.A*, %struct.B*, i32)*** | 
|  | %vtable = load void (%struct.A*, %struct.B*, i32)**, void (%struct.A*, %struct.B*, i32)*** %1 | 
|  | %vfn = getelementptr inbounds void (%struct.A*, %struct.B*, i32)*, void (%struct.A*, %struct.B*, i32)** %vtable, i32 4 | 
|  | %2 = load void (%struct.A*, %struct.B*, i32)*, void (%struct.A*, %struct.B*, i32)** %vfn | 
|  | musttail call x86_thiscallcc void %2(%struct.A* sret %agg.result, %struct.B* %this, i32 %0) | 
|  | ret void | 
|  | } | 
|  |  | 
|  | ; CHECK-LABEL: _stdcall_thunk@8: | 
|  | ; CHECK-NOT: mov %{{.*}}, {{.*(.*esp.*)}} | 
|  | ; CHECK: jmpl | 
|  | ; CHECK-NOT: ret | 
|  | define x86_stdcallcc i32 @stdcall_thunk(<{ %struct.B*, %struct.A }>* inalloca) { | 
|  | entry: | 
|  | %this_ptr = getelementptr inbounds <{ %struct.B*, %struct.A }>, <{ %struct.B*, %struct.A }>* %0, i32 0, i32 0 | 
|  | %this = load %struct.B*, %struct.B** %this_ptr | 
|  | %1 = bitcast %struct.B* %this to i32 (<{ %struct.B*, %struct.A }>*)*** | 
|  | %vtable = load i32 (<{ %struct.B*, %struct.A }>*)**, i32 (<{ %struct.B*, %struct.A }>*)*** %1 | 
|  | %vfn = getelementptr inbounds i32 (<{ %struct.B*, %struct.A }>*)*, i32 (<{ %struct.B*, %struct.A }>*)** %vtable, i32 1 | 
|  | %2 = load i32 (<{ %struct.B*, %struct.A }>*)*, i32 (<{ %struct.B*, %struct.A }>*)** %vfn | 
|  | %3 = musttail call x86_stdcallcc i32 %2(<{ %struct.B*, %struct.A }>* inalloca %0) | 
|  | ret i32 %3 | 
|  | } | 
|  |  | 
|  | ; CHECK-LABEL: @fastcall_thunk@8: | 
|  | ; CHECK-NOT: mov %{{.*}}, {{.*(.*esp.*)}} | 
|  | ; CHECK: jmpl | 
|  | ; CHECK-NOT: ret | 
|  | define x86_fastcallcc i32 @fastcall_thunk(%struct.B* inreg %this, <{ %struct.A }>* inalloca) { | 
|  | entry: | 
|  | %1 = bitcast %struct.B* %this to i32 (%struct.B*, <{ %struct.A }>*)*** | 
|  | %vtable = load i32 (%struct.B*, <{ %struct.A }>*)**, i32 (%struct.B*, <{ %struct.A }>*)*** %1 | 
|  | %vfn = getelementptr inbounds i32 (%struct.B*, <{ %struct.A }>*)*, i32 (%struct.B*, <{ %struct.A }>*)** %vtable, i32 1 | 
|  | %2 = load i32 (%struct.B*, <{ %struct.A }>*)*, i32 (%struct.B*, <{ %struct.A }>*)** %vfn | 
|  | %3 = musttail call x86_fastcallcc i32 %2(%struct.B* inreg %this, <{ %struct.A }>* inalloca %0) | 
|  | ret i32 %3 | 
|  | } |