1b1c8d83d3
Turning on `enable_noundef_analysis` flag allows better codegen by removing freeze instructions. I modified clang by renaming `enable_noundef_analysis` flag to `disable-noundef-analysis` and turning it off by default. Test updates are made as a separate patch: D108453 Reviewed By: eugenis Differential Revision: https://reviews.llvm.org/D105169
34 lines
2.3 KiB
C++
34 lines
2.3 KiB
C++
// RUN: %clang_cc1 -triple i686-windows-msvc -fms-extensions -emit-llvm -std=c++1y -O0 -o - %s | FileCheck %s
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struct Base {};
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// __declspec(dllexport) causes us to export the implicit constructor.
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struct __declspec(dllexport) Derived : virtual Base {
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// CHECK-LABEL: define weak_odr dso_local dllexport x86_thiscallcc noundef %struct.Derived* @"??0Derived@@QAE@ABU0@@Z"
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// CHECK: %[[this:.*]] = load %struct.Derived*, %struct.Derived** {{.*}}
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// CHECK-NEXT: store %struct.Derived* %[[this]], %struct.Derived** %[[retval:.*]]
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// CHECK: %[[dest_a_gep:.*]] = getelementptr inbounds %struct.Derived, %struct.Derived* %[[this]], i32 0, i32 1
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// CHECK-NEXT: %[[src_load:.*]] = load %struct.Derived*, %struct.Derived** {{.*}}
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// CHECK-NEXT: %[[src_a_gep:.*]] = getelementptr inbounds %struct.Derived, %struct.Derived* %[[src_load:.*]], i32 0, i32 1
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// CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 %[[dest_a_gep]], i8* align 4 %[[src_a_gep]], i64 1, i1 false)
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// CHECK-NEXT: %[[dest_this:.*]] = load %struct.Derived*, %struct.Derived** %[[retval]]
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// CHECK-NEXT: ret %struct.Derived* %[[dest_this]]
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bool a : 1;
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bool b : 1;
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};
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// __declspec(dllexport) causes us to export the implicit copy constructor.
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struct __declspec(dllexport) Derived2 : virtual Base {
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// CHECK-LABEL: define weak_odr dso_local dllexport x86_thiscallcc noundef %struct.Derived2* @"??0Derived2@@QAE@ABU0@@Z"
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// CHECK: %[[this:.*]] = load %struct.Derived2*, %struct.Derived2** {{.*}}
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// CHECK-NEXT: store %struct.Derived2* %[[this]], %struct.Derived2** %[[retval:.*]]
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// CHECK: %[[dest_a_gep:.*]] = getelementptr inbounds %struct.Derived2, %struct.Derived2* %[[this]], i32 0, i32 1
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// CHECK-NEXT: %[[src_load:.*]] = load %struct.Derived2*, %struct.Derived2** {{.*}}
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// CHECK-NEXT: %[[src_a_gep:.*]] = getelementptr inbounds %struct.Derived2, %struct.Derived2* %[[src_load:.*]], i32 0, i32 1
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// CHECK-NEXT: %[[dest_a_bitcast:.*]] = bitcast [1 x i32]* %[[dest_a_gep]] to i8*
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// CHECK-NEXT: %[[src_a_bitcast:.*]] = bitcast [1 x i32]* %[[src_a_gep]] to i8*
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// CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 4 %[[dest_a_bitcast]], i8* align 4 %[[src_a_bitcast]], i32 4, i1 false)
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// CHECK-NEXT: %[[dest_this:.*]] = load %struct.Derived2*, %struct.Derived2** %[[retval]]
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// CHECK-NEXT: ret %struct.Derived2* %[[dest_this]]
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int Array[1];
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};
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