147 lines
3.7 KiB
C++
147 lines
3.7 KiB
C++
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// RUN: %clang_cc1 -triple armv7-unknown-linux-gnueabihf %s -o - -emit-llvm -O2 | 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: [[T2:%.*]] = alloca %struct.Combiner
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// CHECK: [[T1:%.*]] = alloca %struct.Combiner
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// CHECK: [[T3:%.*]] = call %struct.Combiner* @_ZN8CombinerC1E7S_large(%struct.Combiner* {{[^,]*}} [[T1]], [9 x i32] %s.coerce)
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// CHECK: call void @_ZN8Combiner1fEv(%struct.Combiner* nonnull sret(%struct.Combiner) align 4 [[T2]], %struct.Combiner* {{[^,]*}} [[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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