PGO: simple generic method is not inlined #88299
Description
for (int i = 0; i < 100; i++) { Test(new ObjImpl<string>()); Thread.Sleep(16); } [MethodImpl(MethodImplOptions.NoInlining)] static object Test(IObj o) => o.GetObj(); public interface IObj { object GetObj(); } public class ObjImpl<T> : IObj { public object GetObj() => typeof(T); }Codegen for Test in Tier1:
; Assembly listing for method Program:<<Main>$>g__Test|0_0(IObj):System.Object (Tier1) sub rsp, 40 mov rax, 0xD1FFAB1E ; ObjImpl`1[System.String] cmp qword ptr [rcx], rax jne SHORT G_M33634_IG06 call [ObjImpl`1[System.__Canon]:GetObj():System.Object:this] G_M33634_IG04: nop add rsp, 40 ret G_M33634_IG06: mov r11, 0xD1FFAB1E ; code for IObj:GetObj():System.Object:this call [r11]IObj:GetObj():System.Object:this jmp SHORT G_M33634_IG04 ; Total bytes of code 46,GDV is applied but the method is not inlined, presumably, the root cause is the same as in #87597 - generic context from the GDV candidate is not kept (but I am not sure, decided to file since I noticed a similiar pattern in real code)