JIT does not recognize typeof(X) == o.GetType() checks as intrinsics with R2R #97134
Description
Repro:
using System;
using System.Runtime.CompilerServices;
public sealed class Test96876
{
public static void Main()
{
foo<Test96876>(new DateTime[1]);
}
// Validate that the type equality involving shared array types is handled correctly
// in shared generic code.
[MethodImpl(MethodImplOptions.NoInlining)]
static bool foo<T>(DateTime[] list) => typeof(T[]) == list.GetType();
}Actual result:
foo<__Canon> is optimized to return constant for JIT, but does full type check for R2R.
Expected result
foo<__Canon> is optimized to return constant for both JIT and R2R.
Optimized JIT code:
G_M10478_IG02: ;; offset=0x0000
cmp byte ptr [rdx], dl
xor eax, eax
;; size=4 bbWeight=1 PerfScore 3.25
G_M10478_IG03: ;; offset=0x0004
ret
Optimized R2R code:
G_M000_IG01: ;; offset=0x0000
push rbx
sub rsp, 48
mov qword ptr [rsp+0x28], rcx
mov rbx, rdx
G_M000_IG02: ;; offset=0x000D
call [CORINFO_HELP_READYTORUN_GENERIC_HANDLE]
cmp qword ptr [rbx], rax
sete al
movzx rax, al
G_M000_IG03: ;; offset=0x001C
add rsp, 48
pop rbx
ret