557c20a886
Summary: This flag is enabled by default in the driver when NDEBUG is set. It is forwarded on the LLVMContext to discard all value names (but GlobalValue) for performance purpose. This an improved version of D18024 Reviewers: echristo, chandlerc Subscribers: cfe-commits Differential Revision: http://reviews.llvm.org/D18127 From: Mehdi Amini <mehdi.amini@apple.com> llvm-svn: 263394
147 lines
3.7 KiB
C++
147 lines
3.7 KiB
C++
// RUN: %clang_cc1 -triple armv7-unknown-linux-gnueabihf %s -o - -emit-llvm -O1 | FileCheck %s
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// Stack should be reused when possible, no need to allocate two separate slots
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// if they have disjoint lifetime.
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// Sizes of objects are related to previously existed threshold of 32. In case
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// of S_large stack size is rounded to 40 bytes.
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// 32B
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struct S_small {
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int a[8];
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};
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// 36B
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struct S_large {
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int a[9];
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};
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// Helper class for lifetime scope absence testing
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struct Combiner {
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S_large a, b;
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Combiner(S_large);
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Combiner f();
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};
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extern S_small foo_small();
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extern S_large foo_large();
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extern void bar_small(S_small*);
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extern void bar_large(S_large*);
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// Prevent mangling of function names.
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extern "C" {
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void small_rvoed_unnamed_temporary_object() {
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// CHECK-LABEL: define void @small_rvoed_unnamed_temporary_object
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// CHECK: call void @llvm.lifetime.start
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// CHECK: call void @_Z9foo_smallv
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// CHECK: call void @llvm.lifetime.end
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// CHECK: call void @llvm.lifetime.start
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// CHECK: call void @_Z9foo_smallv
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// CHECK: call void @llvm.lifetime.end
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foo_small();
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foo_small();
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}
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void large_rvoed_unnamed_temporary_object() {
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// CHECK-LABEL: define void @large_rvoed_unnamed_temporary_object
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// CHECK: call void @llvm.lifetime.start
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// CHECK: call void @_Z9foo_largev
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// CHECK: call void @llvm.lifetime.end
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// CHECK: call void @llvm.lifetime.start
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// CHECK: call void @_Z9foo_largev
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// CHECK: call void @llvm.lifetime.end
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foo_large();
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foo_large();
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}
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void small_rvoed_named_temporary_object() {
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// CHECK-LABEL: define void @small_rvoed_named_temporary_object
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// CHECK: call void @llvm.lifetime.start
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// CHECK: call void @_Z9foo_smallv
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// CHECK: call void @llvm.lifetime.end
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// CHECK: call void @llvm.lifetime.start
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// CHECK: call void @_Z9foo_smallv
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// CHECK: call void @llvm.lifetime.end
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{
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S_small s = foo_small();
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}
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{
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S_small s = foo_small();
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}
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}
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void large_rvoed_named_temporary_object() {
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// CHECK-LABEL: define void @large_rvoed_named_temporary_object
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// CHECK: call void @llvm.lifetime.start
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// CHECK: call void @_Z9foo_largev
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// CHECK: call void @llvm.lifetime.end
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// CHECK: call void @llvm.lifetime.start
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// CHECK: call void @_Z9foo_largev
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// CHECK: call void @llvm.lifetime.end
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{
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S_large s = foo_large();
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}
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{
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S_large s = foo_large();
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}
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}
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void small_auto_object() {
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// CHECK-LABEL: define void @small_auto_object
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// CHECK: call void @llvm.lifetime.start
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// CHECK: call void @_Z9bar_smallP7S_small
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// CHECK: call void @llvm.lifetime.end
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// CHECK: call void @llvm.lifetime.start
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// CHECK: call void @_Z9bar_smallP7S_small
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// CHECK: call void @llvm.lifetime.end
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{
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S_small s;
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bar_small(&s);
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}
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{
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S_small s;
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bar_small(&s);
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}
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}
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void large_auto_object() {
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// CHECK-LABEL: define void @large_auto_object
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// CHECK: call void @llvm.lifetime.start
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// CHECK: call void @_Z9bar_largeP7S_large
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// CHECK: call void @llvm.lifetime.end
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// CHECK: call void @llvm.lifetime.start
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// CHECK: call void @_Z9bar_largeP7S_large
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// CHECK: call void @llvm.lifetime.end
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{
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S_large s;
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bar_large(&s);
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}
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{
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S_large s;
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bar_large(&s);
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}
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}
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int large_combiner_test(S_large s) {
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// CHECK-LABEL: define i32 @large_combiner_test
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// CHECK: [[T1:%.*]] = alloca %struct.Combiner
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// CHECK: [[T2:%.*]] = alloca %struct.Combiner
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// CHECK: [[T3:%.*]] = call %struct.Combiner* @_ZN8CombinerC1E7S_large(%struct.Combiner* nonnull [[T1]], [9 x i32] %s.coerce)
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// CHECK: call void @_ZN8Combiner1fEv(%struct.Combiner* nonnull sret [[T2]], %struct.Combiner* nonnull [[T1]])
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// CHECK: [[T4:%.*]] = getelementptr inbounds %struct.Combiner, %struct.Combiner* [[T2]], i32 0, i32 0, i32 0, i32 0
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// CHECK: [[T5:%.*]] = load i32, i32* [[T4]]
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// CHECK: ret i32 [[T5]]
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return Combiner(s).f().a.a[0];
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}
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}
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