Suboptimal struct zeroing in case of gc pointers #83297
Description
public struct MyStruct
{
public long a;
public long b;
public long c;
public long d;
public long e;
public long f;
public long g;
public long h;
public long i;
public long j;
public long k;
public long l;
public long m;
public long n;
public long o;
public string s;
}
public MyStruct Foo()
{
MyStruct s = default;
return s;
}; Method Program:Foo():Program+MyStruct:this
33C0 xor eax, eax
488902 mov qword ptr [rdx], rax
48894208 mov qword ptr [rdx+08H], rax
48894210 mov qword ptr [rdx+10H], rax
48894218 mov qword ptr [rdx+18H], rax
48894220 mov qword ptr [rdx+20H], rax
48894228 mov qword ptr [rdx+28H], rax
48894230 mov qword ptr [rdx+30H], rax
48894238 mov qword ptr [rdx+38H], rax
48894240 mov qword ptr [rdx+40H], rax
48894248 mov qword ptr [rdx+48H], rax
48894250 mov qword ptr [rdx+50H], rax
48894258 mov qword ptr [rdx+58H], rax
48894260 mov qword ptr [rdx+60H], rax
48894268 mov qword ptr [rdx+68H], rax
48894270 mov qword ptr [rdx+70H], rax
48894278 mov qword ptr [rdx+78H], rax
488BC2 mov rax, rdx
C3 ret
; Total bytes of code: 69JIT gives up on SIMDs because of gc pointers in a struct while it could use SIMD only for unmanaged part