Use the correct alignment for POD-member memcpys where the first field is a
bitfield. CGBitField::StorageAlignment holds the alignment in chars, but
emitMemcpy had been treating it as if it were held in bits, leading to
underaligned memcpys.
Related to PR15348.
Thanks very much to Chandler for the diagnosis.
llvm-svn: 176163
diff --git a/clang/test/CodeGenCXX/pod-member-memcpys.cpp b/clang/test/CodeGenCXX/pod-member-memcpys.cpp
index fc99137..1e76c08 100644
--- a/clang/test/CodeGenCXX/pod-member-memcpys.cpp
+++ b/clang/test/CodeGenCXX/pod-member-memcpys.cpp
@@ -1,4 +1,5 @@
// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -emit-llvm -std=c++03 -fexceptions -fcxx-exceptions -O1 -o - %s | FileCheck %s
+// RUN: %clang_cc1 -triple i386-apple-darwin10 -emit-llvm -std=c++03 -O0 -o - %s | FileCheck --check-prefix=CHECK-2 %s
struct POD {
int w, x, y, z;
@@ -60,6 +61,12 @@
int z : 6;
};
+struct BitfieldMember2 {
+ unsigned a : 1;
+ unsigned b, c, d;
+ NonPOD np;
+};
+
struct InnerClassMember {
struct {
int a, b, c, d;
@@ -152,6 +159,7 @@
#define CALL_CC(T) T callCC##T(const T& b) { return b; }
+CALL_CC(BitfieldMember2)
CALL_CC(ReferenceMember)
CALL_CC(InnerClassMember)
CALL_CC(BitfieldMember)
@@ -220,3 +228,9 @@
// CHECK: tail call void @_ZN6NonPODC1ERKS_
// CHECK: tail call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 16, i32 8{{.*}})
// CHECK: ret void
+
+// BitfieldMember2 copy-constructor:
+// CHECK-2: define linkonce_odr void @_ZN15BitfieldMember2C2ERKS_(%struct.BitfieldMember2* %this, %struct.BitfieldMember2*)
+// CHECK-2: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 16, i32 4, i1 false)
+// CHECK-2: call void @_ZN6NonPODC1ERKS_
+// CHECK-2: ret void