| // RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm -o - %s \ |
| // RUN: | FileCheck -check-prefix=CHECK-X86-64 %s |
| // RUN: %clang_cc1 -triple powerpc64-unknown-unknown -emit-llvm -o - %s \ |
| // RUN: | FileCheck -check-prefix=CHECK-PPC64 %s |
| // |
| // Tests for bitfield access patterns in C++ with special attention to |
| // conformance to C++11 memory model requirements. |
| |
| namespace N0 { |
| // Test basic bitfield layout access across interesting byte and word |
| // boundaries on both little endian and big endian platforms. |
| struct __attribute__((packed)) S { |
| unsigned b00 : 14; |
| unsigned b01 : 2; |
| unsigned b20 : 6; |
| unsigned b21 : 2; |
| unsigned b30 : 30; |
| unsigned b31 : 2; |
| unsigned b70 : 6; |
| unsigned b71 : 2; |
| }; |
| unsigned read00(S* s) { |
| // CHECK-X86-64-LABEL: define i32 @_ZN2N06read00 |
| // CHECK-X86-64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| // CHECK-X86-64: %[[val:.*]] = load i64, i64* %[[ptr]] |
| // CHECK-X86-64: %[[and:.*]] = and i64 %[[val]], 16383 |
| // CHECK-X86-64: %[[trunc:.*]] = trunc i64 %[[and]] to i32 |
| // CHECK-X86-64: ret i32 %[[trunc]] |
| // CHECK-PPC64-LABEL: define zeroext i32 @_ZN2N06read00 |
| // CHECK-PPC64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| // CHECK-PPC64: %[[val:.*]] = load i64, i64* %[[ptr]] |
| // CHECK-PPC64: %[[shr:.*]] = lshr i64 %[[val]], 50 |
| // CHECK-PPC64: %[[trunc:.*]] = trunc i64 %[[shr]] to i32 |
| // CHECK-PPC64: ret i32 %[[trunc]] |
| return s->b00; |
| } |
| unsigned read01(S* s) { |
| // CHECK-X86-64-LABEL: define i32 @_ZN2N06read01 |
| // CHECK-X86-64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| // CHECK-X86-64: %[[val:.*]] = load i64, i64* %[[ptr]] |
| // CHECK-X86-64: %[[shr:.*]] = lshr i64 %[[val]], 14 |
| // CHECK-X86-64: %[[and:.*]] = and i64 %[[shr]], 3 |
| // CHECK-X86-64: %[[trunc:.*]] = trunc i64 %[[and]] to i32 |
| // CHECK-X86-64: ret i32 %[[trunc]] |
| // CHECK-PPC64-LABEL: define zeroext i32 @_ZN2N06read01 |
| // CHECK-PPC64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| // CHECK-PPC64: %[[val:.*]] = load i64, i64* %[[ptr]] |
| // CHECK-PPC64: %[[shr:.*]] = lshr i64 %[[val]], 48 |
| // CHECK-PPC64: %[[and:.*]] = and i64 %[[shr]], 3 |
| // CHECK-PPC64: %[[trunc:.*]] = trunc i64 %[[and]] to i32 |
| // CHECK-PPC64: ret i32 %[[trunc]] |
| return s->b01; |
| } |
| unsigned read20(S* s) { |
| // CHECK-X86-64-LABEL: define i32 @_ZN2N06read20 |
| // CHECK-X86-64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| // CHECK-X86-64: %[[val:.*]] = load i64, i64* %[[ptr]] |
| // CHECK-X86-64: %[[shr:.*]] = lshr i64 %[[val]], 16 |
| // CHECK-X86-64: %[[and:.*]] = and i64 %[[shr]], 63 |
| // CHECK-X86-64: %[[trunc:.*]] = trunc i64 %[[and]] to i32 |
| // CHECK-X86-64: ret i32 %[[trunc]] |
| // CHECK-PPC64-LABEL: define zeroext i32 @_ZN2N06read20 |
| // CHECK-PPC64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| // CHECK-PPC64: %[[val:.*]] = load i64, i64* %[[ptr]] |
| // CHECK-PPC64: %[[shr:.*]] = lshr i64 %[[val]], 42 |
| // CHECK-PPC64: %[[and:.*]] = and i64 %[[shr]], 63 |
| // CHECK-PPC64: %[[trunc:.*]] = trunc i64 %[[and]] to i32 |
| // CHECK-PPC64: ret i32 %[[trunc]] |
| return s->b20; |
| } |
| unsigned read21(S* s) { |
| // CHECK-X86-64-LABEL: define i32 @_ZN2N06read21 |
| // CHECK-X86-64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| // CHECK-X86-64: %[[val:.*]] = load i64, i64* %[[ptr]] |
| // CHECK-X86-64: %[[shr:.*]] = lshr i64 %[[val]], 22 |
| // CHECK-X86-64: %[[and:.*]] = and i64 %[[shr]], 3 |
| // CHECK-X86-64: %[[trunc:.*]] = trunc i64 %[[and]] to i32 |
| // CHECK-X86-64: ret i32 %[[trunc]] |
| // CHECK-PPC64-LABEL: define zeroext i32 @_ZN2N06read21 |
| // CHECK-PPC64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| // CHECK-PPC64: %[[val:.*]] = load i64, i64* %[[ptr]] |
| // CHECK-PPC64: %[[shr:.*]] = lshr i64 %[[val]], 40 |
| // CHECK-PPC64: %[[and:.*]] = and i64 %[[shr]], 3 |
| // CHECK-PPC64: %[[trunc:.*]] = trunc i64 %[[and]] to i32 |
| // CHECK-PPC64: ret i32 %[[trunc]] |
| return s->b21; |
| } |
| unsigned read30(S* s) { |
| // CHECK-X86-64-LABEL: define i32 @_ZN2N06read30 |
| // CHECK-X86-64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| // CHECK-X86-64: %[[val:.*]] = load i64, i64* %[[ptr]] |
| // CHECK-X86-64: %[[shr:.*]] = lshr i64 %[[val]], 24 |
| // CHECK-X86-64: %[[and:.*]] = and i64 %[[shr]], 1073741823 |
| // CHECK-X86-64: %[[trunc:.*]] = trunc i64 %[[and]] to i32 |
| // CHECK-X86-64: ret i32 %[[trunc]] |
| // CHECK-PPC64-LABEL: define zeroext i32 @_ZN2N06read30 |
| // CHECK-PPC64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| // CHECK-PPC64: %[[val:.*]] = load i64, i64* %[[ptr]] |
| // CHECK-PPC64: %[[shr:.*]] = lshr i64 %[[val]], 10 |
| // CHECK-PPC64: %[[and:.*]] = and i64 %[[shr]], 1073741823 |
| // CHECK-PPC64: %[[trunc:.*]] = trunc i64 %[[and]] to i32 |
| // CHECK-PPC64: ret i32 %[[trunc]] |
| return s->b30; |
| } |
| unsigned read31(S* s) { |
| // CHECK-X86-64-LABEL: define i32 @_ZN2N06read31 |
| // CHECK-X86-64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| // CHECK-X86-64: %[[val:.*]] = load i64, i64* %[[ptr]] |
| // CHECK-X86-64: %[[shr:.*]] = lshr i64 %[[val]], 54 |
| // CHECK-X86-64: %[[and:.*]] = and i64 %[[shr]], 3 |
| // CHECK-X86-64: %[[trunc:.*]] = trunc i64 %[[and]] to i32 |
| // CHECK-X86-64: ret i32 %[[trunc]] |
| // CHECK-PPC64-LABEL: define zeroext i32 @_ZN2N06read31 |
| // CHECK-PPC64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| // CHECK-PPC64: %[[val:.*]] = load i64, i64* %[[ptr]] |
| // CHECK-PPC64: %[[shr:.*]] = lshr i64 %[[val]], 8 |
| // CHECK-PPC64: %[[and:.*]] = and i64 %[[shr]], 3 |
| // CHECK-PPC64: %[[trunc:.*]] = trunc i64 %[[and]] to i32 |
| // CHECK-PPC64: ret i32 %[[trunc]] |
| return s->b31; |
| } |
| unsigned read70(S* s) { |
| // CHECK-X86-64-LABEL: define i32 @_ZN2N06read70 |
| // CHECK-X86-64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| // CHECK-X86-64: %[[val:.*]] = load i64, i64* %[[ptr]] |
| // CHECK-X86-64: %[[shr:.*]] = lshr i64 %[[val]], 56 |
| // CHECK-X86-64: %[[and:.*]] = and i64 %[[shr]], 63 |
| // CHECK-X86-64: %[[trunc:.*]] = trunc i64 %[[and]] to i32 |
| // CHECK-X86-64: ret i32 %[[trunc]] |
| // CHECK-PPC64-LABEL: define zeroext i32 @_ZN2N06read70 |
| // CHECK-PPC64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| // CHECK-PPC64: %[[val:.*]] = load i64, i64* %[[ptr]] |
| // CHECK-PPC64: %[[shr:.*]] = lshr i64 %[[val]], 2 |
| // CHECK-PPC64: %[[and:.*]] = and i64 %[[shr]], 63 |
| // CHECK-PPC64: %[[trunc:.*]] = trunc i64 %[[and]] to i32 |
| // CHECK-PPC64: ret i32 %[[trunc]] |
| return s->b70; |
| } |
| unsigned read71(S* s) { |
| // CHECK-X86-64-LABEL: define i32 @_ZN2N06read71 |
| // CHECK-X86-64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| // CHECK-X86-64: %[[val:.*]] = load i64, i64* %[[ptr]] |
| // CHECK-X86-64: %[[shr:.*]] = lshr i64 %[[val]], 62 |
| // CHECK-X86-64: %[[trunc:.*]] = trunc i64 %[[shr]] to i32 |
| // CHECK-X86-64: ret i32 %[[trunc]] |
| // CHECK-PPC64-LABEL: define zeroext i32 @_ZN2N06read71 |
| // CHECK-PPC64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| // CHECK-PPC64: %[[val:.*]] = load i64, i64* %[[ptr]] |
| // CHECK-PPC64: %[[and:.*]] = and i64 %[[val]], 3 |
| // CHECK-PPC64: %[[trunc:.*]] = trunc i64 %[[and]] to i32 |
| // CHECK-PPC64: ret i32 %[[trunc]] |
| return s->b71; |
| } |
| } |
| |
| namespace N1 { |
| // Ensure that neither loads nor stores to bitfields are not widened into |
| // other memory locations. (PR13691) |
| // |
| // NOTE: We could potentially widen loads based on their alignment if we are |
| // comfortable requiring that subsequent memory locations within the |
| // alignment-widened load are not volatile. |
| struct S { |
| char a; |
| unsigned b : 1; |
| char c; |
| }; |
| unsigned read(S* s) { |
| // CHECK-X86-64-LABEL: define i32 @_ZN2N14read |
| // CHECK-X86-64: %[[ptr:.*]] = getelementptr inbounds %{{.*}}, %{{.*}}* %{{.*}}, i32 0, i32 1 |
| // CHECK-X86-64: %[[val:.*]] = load i8, i8* %[[ptr]] |
| // CHECK-X86-64: %[[and:.*]] = and i8 %[[val]], 1 |
| // CHECK-X86-64: %[[ext:.*]] = zext i8 %[[and]] to i32 |
| // CHECK-X86-64: ret i32 %[[ext]] |
| // CHECK-PPC64-LABEL: define zeroext i32 @_ZN2N14read |
| // CHECK-PPC64: %[[ptr:.*]] = getelementptr inbounds %{{.*}}, %{{.*}}* %{{.*}}, i32 0, i32 1 |
| // CHECK-PPC64: %[[val:.*]] = load i8, i8* %[[ptr]] |
| // CHECK-PPC64: %[[shr:.*]] = lshr i8 %[[val]], 7 |
| // CHECK-PPC64: %[[ext:.*]] = zext i8 %[[shr]] to i32 |
| // CHECK-PPC64: ret i32 %[[ext]] |
| return s->b; |
| } |
| void write(S* s, unsigned x) { |
| // CHECK-X86-64-LABEL: define void @_ZN2N15write |
| // CHECK-X86-64: %[[ptr:.*]] = getelementptr inbounds %{{.*}}, %{{.*}}* %{{.*}}, i32 0, i32 1 |
| // CHECK-X86-64: %[[x_trunc:.*]] = trunc i32 %{{.*}} to i8 |
| // CHECK-X86-64: %[[old:.*]] = load i8, i8* %[[ptr]] |
| // CHECK-X86-64: %[[x_and:.*]] = and i8 %[[x_trunc]], 1 |
| // CHECK-X86-64: %[[old_and:.*]] = and i8 %[[old]], -2 |
| // CHECK-X86-64: %[[new:.*]] = or i8 %[[old_and]], %[[x_and]] |
| // CHECK-X86-64: store i8 %[[new]], i8* %[[ptr]] |
| // CHECK-PPC64-LABEL: define void @_ZN2N15write |
| // CHECK-PPC64: %[[ptr:.*]] = getelementptr inbounds %{{.*}}, %{{.*}}* %{{.*}}, i32 0, i32 1 |
| // CHECK-PPC64: %[[x_trunc:.*]] = trunc i32 %{{.*}} to i8 |
| // CHECK-PPC64: %[[old:.*]] = load i8, i8* %[[ptr]] |
| // CHECK-PPC64: %[[x_and:.*]] = and i8 %[[x_trunc]], 1 |
| // CHECK-PPC64: %[[x_shl:.*]] = shl i8 %[[x_and]], 7 |
| // CHECK-PPC64: %[[old_and:.*]] = and i8 %[[old]], 127 |
| // CHECK-PPC64: %[[new:.*]] = or i8 %[[old_and]], %[[x_shl]] |
| // CHECK-PPC64: store i8 %[[new]], i8* %[[ptr]] |
| s->b = x; |
| } |
| } |
| |
| namespace N2 { |
| // Do widen loads and stores to bitfields when those bitfields have padding |
| // within the struct following them. |
| struct S { |
| unsigned b : 24; |
| void *p; |
| }; |
| unsigned read(S* s) { |
| // CHECK-X86-64-LABEL: define i32 @_ZN2N24read |
| // CHECK-X86-64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i32* |
| // CHECK-X86-64: %[[val:.*]] = load i32, i32* %[[ptr]] |
| // CHECK-X86-64: %[[and:.*]] = and i32 %[[val]], 16777215 |
| // CHECK-X86-64: ret i32 %[[and]] |
| // CHECK-PPC64-LABEL: define zeroext i32 @_ZN2N24read |
| // CHECK-PPC64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i32* |
| // CHECK-PPC64: %[[val:.*]] = load i32, i32* %[[ptr]] |
| // CHECK-PPC64: %[[shr:.*]] = lshr i32 %[[val]], 8 |
| // CHECK-PPC64: ret i32 %[[shr]] |
| return s->b; |
| } |
| void write(S* s, unsigned x) { |
| // CHECK-X86-64-LABEL: define void @_ZN2N25write |
| // CHECK-X86-64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i32* |
| // CHECK-X86-64: %[[old:.*]] = load i32, i32* %[[ptr]] |
| // CHECK-X86-64: %[[x_and:.*]] = and i32 %{{.*}}, 16777215 |
| // CHECK-X86-64: %[[old_and:.*]] = and i32 %[[old]], -16777216 |
| // CHECK-X86-64: %[[new:.*]] = or i32 %[[old_and]], %[[x_and]] |
| // CHECK-X86-64: store i32 %[[new]], i32* %[[ptr]] |
| // CHECK-PPC64-LABEL: define void @_ZN2N25write |
| // CHECK-PPC64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i32* |
| // CHECK-PPC64: %[[old:.*]] = load i32, i32* %[[ptr]] |
| // CHECK-PPC64: %[[x_and:.*]] = and i32 %{{.*}}, 16777215 |
| // CHECK-PPC64: %[[x_shl:.*]] = shl i32 %[[x_and]], 8 |
| // CHECK-PPC64: %[[old_and:.*]] = and i32 %[[old]], 255 |
| // CHECK-PPC64: %[[new:.*]] = or i32 %[[old_and]], %[[x_shl]] |
| // CHECK-PPC64: store i32 %[[new]], i32* %[[ptr]] |
| s->b = x; |
| } |
| } |
| |
| namespace N3 { |
| // Do widen loads and stores to bitfields through the trailing padding at the |
| // end of a struct. |
| struct S { |
| unsigned b : 24; |
| }; |
| unsigned read(S* s) { |
| // CHECK-X86-64-LABEL: define i32 @_ZN2N34read |
| // CHECK-X86-64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i32* |
| // CHECK-X86-64: %[[val:.*]] = load i32, i32* %[[ptr]] |
| // CHECK-X86-64: %[[and:.*]] = and i32 %[[val]], 16777215 |
| // CHECK-X86-64: ret i32 %[[and]] |
| // CHECK-PPC64-LABEL: define zeroext i32 @_ZN2N34read |
| // CHECK-PPC64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i32* |
| // CHECK-PPC64: %[[val:.*]] = load i32, i32* %[[ptr]] |
| // CHECK-PPC64: %[[shr:.*]] = lshr i32 %[[val]], 8 |
| // CHECK-PPC64: ret i32 %[[shr]] |
| return s->b; |
| } |
| void write(S* s, unsigned x) { |
| // CHECK-X86-64-LABEL: define void @_ZN2N35write |
| // CHECK-X86-64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i32* |
| // CHECK-X86-64: %[[old:.*]] = load i32, i32* %[[ptr]] |
| // CHECK-X86-64: %[[x_and:.*]] = and i32 %{{.*}}, 16777215 |
| // CHECK-X86-64: %[[old_and:.*]] = and i32 %[[old]], -16777216 |
| // CHECK-X86-64: %[[new:.*]] = or i32 %[[old_and]], %[[x_and]] |
| // CHECK-X86-64: store i32 %[[new]], i32* %[[ptr]] |
| // CHECK-PPC64-LABEL: define void @_ZN2N35write |
| // CHECK-PPC64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i32* |
| // CHECK-PPC64: %[[old:.*]] = load i32, i32* %[[ptr]] |
| // CHECK-PPC64: %[[x_and:.*]] = and i32 %{{.*}}, 16777215 |
| // CHECK-PPC64: %[[x_shl:.*]] = shl i32 %[[x_and]], 8 |
| // CHECK-PPC64: %[[old_and:.*]] = and i32 %[[old]], 255 |
| // CHECK-PPC64: %[[new:.*]] = or i32 %[[old_and]], %[[x_shl]] |
| // CHECK-PPC64: store i32 %[[new]], i32* %[[ptr]] |
| s->b = x; |
| } |
| } |
| |
| namespace N4 { |
| // Do NOT widen loads and stores to bitfields into padding at the end of |
| // a class which might end up with members inside of it when inside a derived |
| // class. |
| struct Base { |
| virtual ~Base() {} |
| |
| unsigned b : 24; |
| }; |
| // Imagine some other translation unit introduces: |
| #if 0 |
| struct Derived : public Base { |
| char c; |
| }; |
| #endif |
| unsigned read(Base* s) { |
| // FIXME: We should widen this load as long as the function isn't being |
| // instrumented by ThreadSanitizer. |
| // |
| // CHECK-X86-64-LABEL: define i32 @_ZN2N44read |
| // CHECK-X86-64: %[[gep:.*]] = getelementptr inbounds {{.*}}, {{.*}}* %{{.*}}, i32 0, i32 1 |
| // CHECK-X86-64: %[[ptr:.*]] = bitcast [3 x i8]* %[[gep]] to i24* |
| // CHECK-X86-64: %[[val:.*]] = load i24, i24* %[[ptr]] |
| // CHECK-X86-64: %[[ext:.*]] = zext i24 %[[val]] to i32 |
| // CHECK-X86-64: ret i32 %[[ext]] |
| // CHECK-PPC64-LABEL: define zeroext i32 @_ZN2N44read |
| // CHECK-PPC64: %[[gep:.*]] = getelementptr inbounds {{.*}}, {{.*}}* %{{.*}}, i32 0, i32 1 |
| // CHECK-PPC64: %[[ptr:.*]] = bitcast [3 x i8]* %[[gep]] to i24* |
| // CHECK-PPC64: %[[val:.*]] = load i24, i24* %[[ptr]] |
| // CHECK-PPC64: %[[ext:.*]] = zext i24 %[[val]] to i32 |
| // CHECK-PPC64: ret i32 %[[ext]] |
| return s->b; |
| } |
| void write(Base* s, unsigned x) { |
| // CHECK-X86-64-LABEL: define void @_ZN2N45write |
| // CHECK-X86-64: %[[gep:.*]] = getelementptr inbounds {{.*}}, {{.*}}* %{{.*}}, i32 0, i32 1 |
| // CHECK-X86-64: %[[ptr:.*]] = bitcast [3 x i8]* %[[gep]] to i24* |
| // CHECK-X86-64: %[[new:.*]] = trunc i32 %{{.*}} to i24 |
| // CHECK-X86-64: store i24 %[[new]], i24* %[[ptr]] |
| // CHECK-PPC64-LABEL: define void @_ZN2N45write |
| // CHECK-PPC64: %[[gep:.*]] = getelementptr inbounds {{.*}}, {{.*}}* %{{.*}}, i32 0, i32 1 |
| // CHECK-PPC64: %[[ptr:.*]] = bitcast [3 x i8]* %[[gep]] to i24* |
| // CHECK-PPC64: %[[new:.*]] = trunc i32 %{{.*}} to i24 |
| // CHECK-PPC64: store i24 %[[new]], i24* %[[ptr]] |
| s->b = x; |
| } |
| } |
| |
| namespace N5 { |
| // Widen through padding at the end of a struct even if that struct |
| // participates in a union with another struct which has a separate field in |
| // that location. The reasoning is that if the operation is storing to that |
| // member of the union, it must be the active member, and thus we can write |
| // through the padding. If it is a load, it might be a load of a common |
| // prefix through a non-active member, but in such a case the extra bits |
| // loaded are masked off anyways. |
| union U { |
| struct X { unsigned b : 24; char c; } x; |
| struct Y { unsigned b : 24; } y; |
| }; |
| unsigned read(U* u) { |
| // CHECK-X86-64-LABEL: define i32 @_ZN2N54read |
| // CHECK-X86-64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i32* |
| // CHECK-X86-64: %[[val:.*]] = load i32, i32* %[[ptr]] |
| // CHECK-X86-64: %[[and:.*]] = and i32 %[[val]], 16777215 |
| // CHECK-X86-64: ret i32 %[[and]] |
| // CHECK-PPC64-LABEL: define zeroext i32 @_ZN2N54read |
| // CHECK-PPC64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i32* |
| // CHECK-PPC64: %[[val:.*]] = load i32, i32* %[[ptr]] |
| // CHECK-PPC64: %[[shr:.*]] = lshr i32 %[[val]], 8 |
| // CHECK-PPC64: ret i32 %[[shr]] |
| return u->y.b; |
| } |
| void write(U* u, unsigned x) { |
| // CHECK-X86-64-LABEL: define void @_ZN2N55write |
| // CHECK-X86-64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i32* |
| // CHECK-X86-64: %[[old:.*]] = load i32, i32* %[[ptr]] |
| // CHECK-X86-64: %[[x_and:.*]] = and i32 %{{.*}}, 16777215 |
| // CHECK-X86-64: %[[old_and:.*]] = and i32 %[[old]], -16777216 |
| // CHECK-X86-64: %[[new:.*]] = or i32 %[[old_and]], %[[x_and]] |
| // CHECK-X86-64: store i32 %[[new]], i32* %[[ptr]] |
| // CHECK-PPC64-LABEL: define void @_ZN2N55write |
| // CHECK-PPC64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i32* |
| // CHECK-PPC64: %[[old:.*]] = load i32, i32* %[[ptr]] |
| // CHECK-PPC64: %[[x_and:.*]] = and i32 %{{.*}}, 16777215 |
| // CHECK-PPC64: %[[x_shl:.*]] = shl i32 %[[x_and]], 8 |
| // CHECK-PPC64: %[[old_and:.*]] = and i32 %[[old]], 255 |
| // CHECK-PPC64: %[[new:.*]] = or i32 %[[old_and]], %[[x_shl]] |
| // CHECK-PPC64: store i32 %[[new]], i32* %[[ptr]] |
| u->y.b = x; |
| } |
| } |
| |
| namespace N6 { |
| // Zero-length bitfields partition the memory locations of bitfields for the |
| // purposes of the memory model. That means stores must not span zero-length |
| // bitfields and loads may only span them when we are not instrumenting with |
| // ThreadSanitizer. |
| // FIXME: We currently don't widen loads even without ThreadSanitizer, even |
| // though we could. |
| struct S { |
| unsigned b1 : 24; |
| unsigned char : 0; |
| unsigned char b2 : 8; |
| }; |
| unsigned read(S* s) { |
| // CHECK-X86-64-LABEL: define i32 @_ZN2N64read |
| // CHECK-X86-64: %[[ptr1:.*]] = bitcast {{.*}}* %{{.*}} to i24* |
| // CHECK-X86-64: %[[val1:.*]] = load i24, i24* %[[ptr1]] |
| // CHECK-X86-64: %[[ext1:.*]] = zext i24 %[[val1]] to i32 |
| // CHECK-X86-64: %[[ptr2:.*]] = getelementptr inbounds {{.*}}, {{.*}}* %{{.*}}, i32 0, i32 1 |
| // CHECK-X86-64: %[[val2:.*]] = load i8, i8* %[[ptr2]] |
| // CHECK-X86-64: %[[ext2:.*]] = zext i8 %[[val2]] to i32 |
| // CHECK-X86-64: %[[add:.*]] = add nsw i32 %[[ext1]], %[[ext2]] |
| // CHECK-X86-64: ret i32 %[[add]] |
| // CHECK-PPC64-LABEL: define zeroext i32 @_ZN2N64read |
| // CHECK-PPC64: %[[ptr1:.*]] = bitcast {{.*}}* %{{.*}} to i24* |
| // CHECK-PPC64: %[[val1:.*]] = load i24, i24* %[[ptr1]] |
| // CHECK-PPC64: %[[ext1:.*]] = zext i24 %[[val1]] to i32 |
| // CHECK-PPC64: %[[ptr2:.*]] = getelementptr inbounds {{.*}}, {{.*}}* %{{.*}}, i32 0, i32 1 |
| // CHECK-PPC64: %[[val2:.*]] = load i8, i8* %[[ptr2]] |
| // CHECK-PPC64: %[[ext2:.*]] = zext i8 %[[val2]] to i32 |
| // CHECK-PPC64: %[[add:.*]] = add nsw i32 %[[ext1]], %[[ext2]] |
| // CHECK-PPC64: ret i32 %[[add]] |
| return s->b1 + s->b2; |
| } |
| void write(S* s, unsigned x) { |
| // CHECK-X86-64-LABEL: define void @_ZN2N65write |
| // CHECK-X86-64: %[[ptr1:.*]] = bitcast {{.*}}* %{{.*}} to i24* |
| // CHECK-X86-64: %[[new1:.*]] = trunc i32 %{{.*}} to i24 |
| // CHECK-X86-64: store i24 %[[new1]], i24* %[[ptr1]] |
| // CHECK-X86-64: %[[new2:.*]] = trunc i32 %{{.*}} to i8 |
| // CHECK-X86-64: %[[ptr2:.*]] = getelementptr inbounds {{.*}}, {{.*}}* %{{.*}}, i32 0, i32 1 |
| // CHECK-X86-64: store i8 %[[new2]], i8* %[[ptr2]] |
| // CHECK-PPC64-LABEL: define void @_ZN2N65write |
| // CHECK-PPC64: %[[ptr1:.*]] = bitcast {{.*}}* %{{.*}} to i24* |
| // CHECK-PPC64: %[[new1:.*]] = trunc i32 %{{.*}} to i24 |
| // CHECK-PPC64: store i24 %[[new1]], i24* %[[ptr1]] |
| // CHECK-PPC64: %[[new2:.*]] = trunc i32 %{{.*}} to i8 |
| // CHECK-PPC64: %[[ptr2:.*]] = getelementptr inbounds {{.*}}, {{.*}}* %{{.*}}, i32 0, i32 1 |
| // CHECK-PPC64: store i8 %[[new2]], i8* %[[ptr2]] |
| s->b1 = x; |
| s->b2 = x; |
| } |
| } |
| |
| namespace N7 { |
| // Similar to N4 except that this adds a virtual base to the picture. (PR18430) |
| // Do NOT widen loads and stores to bitfields into padding at the end of |
| // a class which might end up with members inside of it when inside a derived |
| // class. |
| struct B1 { |
| virtual void f(); |
| unsigned b1 : 24; |
| }; |
| struct B2 : virtual B1 { |
| virtual ~B2(); |
| unsigned b : 24; |
| }; |
| // Imagine some other translation unit introduces: |
| #if 0 |
| struct Derived : public B2 { |
| char c; |
| }; |
| #endif |
| unsigned read(B2* s) { |
| // FIXME: We should widen this load as long as the function isn't being |
| // instrumented by ThreadSanitizer. |
| // |
| // CHECK-X86-64-LABEL: define i32 @_ZN2N74read |
| // CHECK-X86-64: %[[gep:.*]] = getelementptr inbounds {{.*}}, {{.*}}* %{{.*}}, i32 0, i32 1 |
| // CHECK-X86-64: %[[ptr:.*]] = bitcast [3 x i8]* %[[gep]] to i24* |
| // CHECK-X86-64: %[[val:.*]] = load i24, i24* %[[ptr]] |
| // CHECK-X86-64: %[[ext:.*]] = zext i24 %[[val]] to i32 |
| // CHECK-X86-64: ret i32 %[[ext]] |
| // CHECK-PPC64-LABEL: define zeroext i32 @_ZN2N74read |
| // CHECK-PPC64: %[[gep:.*]] = getelementptr inbounds {{.*}}, {{.*}}* %{{.*}}, i32 0, i32 1 |
| // CHECK-PPC64: %[[ptr:.*]] = bitcast [3 x i8]* %[[gep]] to i24* |
| // CHECK-PPC64: %[[val:.*]] = load i24, i24* %[[ptr]] |
| // CHECK-PPC64: %[[ext:.*]] = zext i24 %[[val]] to i32 |
| // CHECK-PPC64: ret i32 %[[ext]] |
| return s->b; |
| } |
| void write(B2* s, unsigned x) { |
| // CHECK-X86-64-LABEL: define void @_ZN2N75write |
| // CHECK-X86-64: %[[gep:.*]] = getelementptr inbounds {{.*}}, {{.*}}* %{{.*}}, i32 0, i32 1 |
| // CHECK-X86-64: %[[ptr:.*]] = bitcast [3 x i8]* %[[gep]] to i24* |
| // CHECK-X86-64: %[[new:.*]] = trunc i32 %{{.*}} to i24 |
| // CHECK-X86-64: store i24 %[[new]], i24* %[[ptr]] |
| // CHECK-PPC64-LABEL: define void @_ZN2N75write |
| // CHECK-PPC64: %[[gep:.*]] = getelementptr inbounds {{.*}}, {{.*}}* %{{.*}}, i32 0, i32 1 |
| // CHECK-PPC64: %[[ptr:.*]] = bitcast [3 x i8]* %[[gep]] to i24* |
| // CHECK-PPC64: %[[new:.*]] = trunc i32 %{{.*}} to i24 |
| // CHECK-PPC64: store i24 %[[new]], i24* %[[ptr]] |
| s->b = x; |
| } |
| } |
