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Revert "[CodeGen] Disable aggressive structor optimizations at -O0" 

It breaks the sanitizer build
<http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-autoconf/builds/23739>

This reverts commit r332228.

llvm-svn: 332232
This commit is contained in:
Pavel Labath 2018-05-14 11:35:44 +00:00
parent dffc4ca4f2
commit c370f26251
3 changed files with 10 additions and 15 deletions
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4
clang/lib/CodeGen/ItaniumCXXABI.cpp
View File

@ -3630,16 +3630,12 @@ static StructorCodegen getCodegenToUse(CodeGenModule &CGM,
}
llvm::GlobalValue::LinkageTypes Linkage = CGM.getFunctionLinkage(AliasDecl);
// Only use RAUW in optimized code, as it makes the complete structor symbol
// disappear completely, which degrades debugging experience.
if (CGM.getCodeGenOpts().OptimizationLevel > 0) {
if (llvm::GlobalValue::isDiscardableIfUnused(Linkage))
return StructorCodegen::RAUW;
// FIXME: Should we allow available_externally aliases?
if (!llvm::GlobalAlias::isValidLinkage(Linkage))
return StructorCodegen::RAUW;
}
if (llvm::GlobalValue::isWeakForLinker(Linkage)) {
// Only ELF and wasm support COMDATs with arbitrary names (C5/D5).

9
clang/test/CodeGenCXX/ctor-dtor-alias.cpp
View File

@ -77,12 +77,11 @@ namespace test4 {
// CHECK1: call i32 @__cxa_atexit{{.*}}_ZN5test41AD2Ev
// CHECK1: define linkonce_odr void @_ZN5test41AD2Ev({{.*}} comdat align
// test that we don't do this optimization at -O0 and call the complete
// destructor for B instead. This enables the debugger to see both
// destructors.
// NOOPT: @_ZN5test41BD1Ev = linkonce_odr alias void {{.*}} @_ZN5test41BD2Ev
// test that we don't do this optimization at -O0 so that the debugger can
// see both destructors.
// NOOPT: define internal void @__cxx_global_var_init.2()
// NOOPT: call i32 @__cxa_atexit{{.*}}@_ZN5test41BD1Ev
// NOOPT: call i32 @__cxa_atexit{{.*}}@_ZN5test41BD2Ev
// NOOPT: define linkonce_odr void @_ZN5test41BD2Ev({{.*}} comdat align
struct A {
virtual ~A() {}
};

2
clang/test/CodeGenCXX/float16-declarations.cpp
View File

@ -103,7 +103,7 @@ int main(void) {
C1 c1(f1l);
// CHECK-DAG: [[F1L:%[a-z0-9]+]] = load half, half* %{{.*}}, align 2
// CHECK-DAG: call void @_ZN2C1C1EDF16_(%class.C1* %{{.*}}, half %{{.*}})
// CHECK-DAG: call void @_ZN2C1C2EDF16_(%class.C1* %{{.*}}, half %{{.*}})
S1<_Float16> s1 = { 132.f16 };
// CHECK-DAG: @_ZZ4mainE2s1 = private unnamed_addr constant %struct.S1 { half 0xH5820 }, align 2