https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87370
Bug ID: 87370
Summary: Regression in return struct code
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: trashyankes at wp dot pl
Target Milestone: ---
Test case: https://gcc.godbolt.org/z/58JsxE
```
struct A
{
int b[4];
};
struct B
{
char a[12];
int b;
};
struct C
{
char a[16];
};
A f1(int i)
{
return { };
}
B f2(int i)
{
return { };
}
C f3(int i)
{
return { };
}
```
On x86_64 it create assembly:
```
f1(int):
xor eax, eax
xor edx, edx
ret
f2(int):
pxor xmm0, xmm0
xor eax, eax
movaps XMMWORD PTR [rsp-24], xmm0
mov rdx, QWORD PTR [rsp-16]
ret
f3(int):
xor eax, eax
xor edx, edx
ret
```
Clang and GCC 6.3 generate same code for every function functions.
