llvm-project/clang/test/CodeGenCXX/virtual-base-ctor.cpp

// RUN: %clang_cc1 %s -emit-llvm -triple %itanium_abi_triple -o - -O2 | opt - -S -globalopt -o - | FileCheck %s

struct B;
extern B x;
char y;
typedef __typeof(sizeof(int)) size_t;
struct A { int a; A() { y = ((size_t)this - (size_t)&x) / sizeof(void*); } };
struct B : virtual A { void* x; };    
B x;

// CHECK: @y = global i8 2
Generating assumption loads of vptr after ctor call (fixed) Generating call assume(icmp %vtable, %global_vtable) after constructor call for devirtualization purposes. For more info go to: http://lists.llvm.org/pipermail/cfe-dev/2015-July/044227.html Edit: Fixed version because of PR24479 and other bug caused in chrome. After this patch got reverted because of ScalarEvolution bug (D12719) Merged after John McCall big patch (Added Address). http://reviews.llvm.org/D11859 http://reviews.llvm.org/D12865 llvm-svn: 247646 2015-09-15 08:37:06 +08:00			`// RUN: %clang_cc1 %s -emit-llvm -triple %itanium_abi_triple -o - -O2 \| opt - -S -globalopt -o - \| FileCheck %s`
Test for r91724. llvm-svn: 91730 2009-12-19 07:42:55 +08:00
			`struct B;`
			`extern B x;`
			`char y;`
			`typedef __typeof(sizeof(int)) size_t;`
			`struct A { int a; A() { y = ((size_t)this - (size_t)&x) / sizeof(void*); } };`
			`struct B : virtual A { void* x; };`
			`B x;`

			`// CHECK: @y = global i8 2`