Intrinsify typeof(T).GetGenericTypeDefinition()

[Sergio0694]

Closes #96898

public static Type? Test1<T>() => typeof(T).IsGenericType ? typeof(T).GetGenericTypeDefinition() : null;

Codegen diffs:

; Assembly listing for method Foo:Test1[System.Collections.Generic.KeyValuePair`2[System.__Canon,int]]():System.Type (FullOpts) - sub rsp, 40 - mov qword ptr [rsp+0x20], rcx - mov rcx, qword ptr [rcx+0x40] - mov rcx, qword ptr [rcx] - call CORINFO_HELP_TYPEHANDLE_TO_RUNTIMETYPE - mov rcx, rax - call [System.RuntimeType:GetGenericTypeDefinition():System.Type:this] - nop  - add rsp, 40 + mov rax, 0x275000095B0 ret

public static bool Test2<T>() => typeof(T).IsGenericType && typeof(T).GetGenericTypeDefinition() == typeof(KeyValuePair<,>);

Codegen diffs:

; Assembly listing for method Foo:Test2[System.Collections.Generic.KeyValuePair`2[System.__Canon,int]]():ubyte (FullOpts) - sub rsp, 40 - mov qword ptr [rsp+0x20], rcx - mov rcx, qword ptr [rcx+0x40] - mov rcx, qword ptr [rcx] - call CORINFO_HELP_TYPEHANDLE_TO_RUNTIMETYPE - mov rcx, rax - call [System.RuntimeType:GetGenericTypeDefinition():System.Type:this] - mov rcx, 0x19F800095D8 ; 'System.Collections.Generic.KeyValuePair`2[TKey,TValue]' - cmp rax, rcx - sete al - movzx rax, al - add rsp, 40 + mov eax, 1 ret 

Note

Reopening from #97159 because the bot closed that one.

[Sergio0694]

@MihuBot

[En3Tho]

@Sergio0694 wrong command it seems? Box => bot

[Sergio0694]

Oops, typo, thank you! 😅

[Sergio0694]

@MihuBot

[EgorBo]

@MihuBot

[EgorBo]

Failures are unrelated and changes in the recent force push look good, merging