diff options
Diffstat (limited to 'test/CodeGen/X86/musttail-indirect.ll')
| -rw-r--r-- | test/CodeGen/X86/musttail-indirect.ll | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/test/CodeGen/X86/musttail-indirect.ll b/test/CodeGen/X86/musttail-indirect.ll new file mode 100644 index 0000000..9d21b5e --- /dev/null +++ b/test/CodeGen/X86/musttail-indirect.ll @@ -0,0 +1,124 @@ +; 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)*** %1 + %2 = load 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 }>*)*** %1 + %vfn = getelementptr inbounds i32 (%struct.B*, <{ %struct.A, i32, %struct.A }>*)** %vtable, i32 1 + %2 = load 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 }>*)*** %1 + %vfn = getelementptr inbounds void (%struct.B*, <{ %struct.A, i32, %struct.A }>*)** %vtable, i32 2 + %2 = load 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 }>*)*** %1 + %vfn = getelementptr inbounds %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 }>*)** %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)*** %1 + %vfn = getelementptr inbounds void (%struct.A*, %struct.B*, i32)** %vtable, i32 4 + %2 = load 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 }>* %0, i32 0, i32 0 + %this = load %struct.B** %this_ptr + %1 = bitcast %struct.B* %this to i32 (<{ %struct.B*, %struct.A }>*)*** + %vtable = load i32 (<{ %struct.B*, %struct.A }>*)*** %1 + %vfn = getelementptr inbounds i32 (<{ %struct.B*, %struct.A }>*)** %vtable, i32 1 + %2 = load 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 }>*)*** %1 + %vfn = getelementptr inbounds i32 (%struct.B*, <{ %struct.A }>*)** %vtable, i32 1 + %2 = load i32 (%struct.B*, <{ %struct.A }>*)** %vfn + %3 = musttail call x86_fastcallcc i32 %2(%struct.B* inreg %this, <{ %struct.A }>* inalloca %0) + ret i32 %3 +} |