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llvm-project/clang/test/CodeGenCXX/profile-remap.cpp

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Add target requirement to profile remap test. Fix bots which don't have x86_64 target built (ARM/AArch64). Differential Revision: https://reviews.llvm.org/D53272 llvm-svn: 344593
2018-10-16 16:47:36 +08:00
// REQUIRES: x86-registered-target
//
Add a flag to remap manglings when reading profile data information. This can be used to preserve profiling information across codebase changes that have widespread impact on mangled names, but across which most profiling data should still be usable. For example, when switching from libstdc++ to libc++, or from the old libstdc++ ABI to the new ABI, or even from a 32-bit to a 64-bit build. The user can provide a remapping file specifying parts of mangled names that should be treated as equivalent (eg, std::__1 should be treated as equivalent to std::__cxx11), and profile data will be treated as applying to a particular function if its name is equivalent to the name of a function in the profile data under the provided equivalences. See the documentation change for a description of how this is configured. Remapping is supported for both sample-based profiling and instruction profiling. We do not support remapping indirect branch target information, but all other profile data should be remapped appropriately. Support is only added for the new pass manager. If someone wants to also add support for this for the old pass manager, doing so should be straightforward. llvm-svn: 344199
2018-10-11 07:13:35 +08:00
// RUN: %clang_cc1 -triple x86_64-linux-gnu -fprofile-sample-use=%S/Inputs/profile-remap.samples -fprofile-remapping-file=%S/Inputs/profile-remap.map -fexperimental-new-pass-manager -O2 %s -emit-llvm -o - | FileCheck %s --check-prefixes=CHECK,CHECK-SAMPLES
// RUN: llvm-profdata merge -output %T.profdata %S/Inputs/profile-remap.proftext
// RUN: %clang_cc1 -triple x86_64-linux-gnu -fprofile-instrument-use-path=%T.profdata -fprofile-remapping-file=%S/Inputs/profile-remap.map -fexperimental-new-pass-manager -O2 %s -emit-llvm -o - | FileCheck %s --check-prefixes=CHECK,CHECK-INSTR
namespace Foo {
struct X {};
bool cond();
void bar();
void baz();
void function(X x) {
if (cond())
bar();
else
baz();
}
}
// CHECK: define {{.*}} @_ZN3Foo8functionENS_1XE() {{.*}} !prof [[FUNC_ENTRY:![0-9]*]]
// CHECK: br i1 {{.*}} !prof [[BR_WEIGHTS:![0-9]*]]
//
// FIXME: Laplace's rule of succession is applied to sample profiles...
// CHECK-SAMPLES-DAG: [[FUNC_ENTRY]] = !{!"function_entry_count", i64 1}
// CHECK-SAMPLES-DAG: [[BR_WEIGHTS]] = !{!"branch_weights", i32 11, i32 91}
//
// ... but not to instruction profiles.
// CHECK-INSTR-DAG: [[FUNC_ENTRY]] = !{!"function_entry_count", i64 100}
// CHECK-INSTR-DAG: [[BR_WEIGHTS]] = !{!"branch_weights", i32 10, i32 90}