158d72d728
Set the writable and dead_on_unwind attributes for sret arguments. These indicate that the argument points to writable memory (and it's legal to introduce spurious writes to it on entry to the function) and that the argument memory will not be used if the call unwinds. This enables additional MemCpyOpt/DSE/LICM optimizations.
67 lines
3.2 KiB
C++
67 lines
3.2 KiB
C++
// RUN: %clang_cc1 %s -std=c++1y -triple=i686-pc-win32 -fms-compatibility-version=19.25 -emit-llvm -o - | FileCheck %s
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// RUN: %clang_cc1 %s -std=c++1y -triple=i686-pc-win32 -fms-compatibility-version=19.20 -emit-llvm -o - | FileCheck %s -check-prefix=CHECK-LEGACY
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// RUN: %clang_cc1 %s -std=c++1y -triple=i686-pc-win32 -fms-compatibility-version=19.25 -ftls-model=local-dynamic -emit-llvm -o - | FileCheck %s -check-prefix=CHECK-LD
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struct A {
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A();
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~A();
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};
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// CHECK-DAG: $"??$a@X@@3UA@@A" = comdat any
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// CHECK-DAG: @"??$a@X@@3UA@@A" = linkonce_odr dso_local thread_local global %struct.A zeroinitializer, comdat, align 1
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// CHECK-DAG: @"??__E?$a@X@@YAXXZ$initializer$" = internal constant ptr @"??__E?$a@X@@YAXXZ", section ".CRT$XDU", comdat($"??$a@X@@3UA@@A")
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// CHECK-LD-DAG: $"??$a@X@@3UA@@A" = comdat any
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// CHECK-LD-DAG: @"??$a@X@@3UA@@A" = linkonce_odr dso_local thread_local(localdynamic) global %struct.A zeroinitializer, comdat, align 1
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// CHECK-LD-DAG: @"??__E?$a@X@@YAXXZ$initializer$" = internal constant ptr @"??__E?$a@X@@YAXXZ", section ".CRT$XDU", comdat($"??$a@X@@3UA@@A")
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template <typename T>
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thread_local A a = A();
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// CHECK-DAG: @"?b@@3UA@@A" = dso_local thread_local global %struct.A zeroinitializer, align 1
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// CHECK-DAG: @"__tls_init$initializer$" = internal constant ptr @__tls_init, section ".CRT$XDU"
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// CHECK-DAG: @__tls_guard = external dso_local thread_local global i8
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// CHECK-LD-DAG: @"?b@@3UA@@A" = dso_local thread_local(localdynamic) global %struct.A zeroinitializer, align 1
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// CHECK-LD-DAG: @"__tls_init$initializer$" = internal constant ptr @__tls_init, section ".CRT$XDU"
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// CHECK-LD-DAG: @__tls_guard = external dso_local thread_local global i8
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// CHECK-LEGACY-NOT: @__tls_guard = external dso_local thread_local global i8
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thread_local A b;
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// CHECK-LABEL: declare dso_local void @__dyn_tls_on_demand_init()
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// CHECK-LD-LABEL: declare dso_local void @__dyn_tls_on_demand_init()
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// CHECK-LEGACY-NOT: declare dso_local void @__dyn_tls_on_demand_init()
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// CHECK-LABEL: define dso_local void @"?f@@YA?AUA@@XZ"(ptr dead_on_unwind noalias writable sret(%struct.A) align 1 %agg.result)
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// CHECK: call void @__dyn_tls_on_demand_init()
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// CHECK-LD-LABEL: define dso_local void @"?f@@YA?AUA@@XZ"(ptr dead_on_unwind noalias writable sret(%struct.A) align 1 %agg.result)
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// CHECK-LD: call void @__dyn_tls_on_demand_init()
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// CHECK-LEGACY-NOT: call void @__dyn_tls_on_demand_init()
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thread_local A &c = b;
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thread_local A &d = c;
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A f() {
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(void)a<void>;
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(void)b;
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return c;
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}
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// CHECK-LABEL: define dso_local noundef i32 @"?g@@YAHXZ"()
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// CHECK-NOT: call void @__dyn_tls_on_demand_init()
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// CHECK-LD-LABEL: define dso_local noundef i32 @"?g@@YAHXZ"()
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// CHECK-LD-NOT: call void @__dyn_tls_on_demand_init()
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thread_local int e = 2;
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int g() {
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return e;
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}
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// CHECK-LABEL: define internal void @__tls_init()
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// CHECK: call void @"??__Eb@@YAXXZ"
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// CHECK-LD-LABEL: define internal void @__tls_init()
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// CHECK-LD: call void @"??__Eb@@YAXXZ"
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// CHECK: !llvm.linker.options = !{![[dyn_tls_init:[0-9]+]]}
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// CHECK: ![[dyn_tls_init]] = !{!"/include:___dyn_tls_init@12"}
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// CHECK-LD: !llvm.linker.options = !{![[dyn_tls_init:[0-9]+]]}
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// CHECK-LD: ![[dyn_tls_init]] = !{!"/include:___dyn_tls_init@12"}
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