See https://riii.me/ishafatimabenchmarks

switchexpression.cs

public class C {
public static string SwitchExpression(int roleId)
    => roleId switch
    {
        1 => "A",
        2 => "B",
        3 => "C",
        4 => "D",
        5 => "E",
        6 => "F",
        7 => "G",
        8 => "H",
        9 => "I",
        10 => "J",
        11 => "K",
        12 => "L",
        13 => "M",
        14 => "N",
        15 => "O",
        16 => "P",
        17 => "Q",
        18 => "R",
        19 => "S",
        20 => "T",
        21 => "U",
        22 => "V",
        23 => "W",
        24 => "X",
        25 => "Y",
        26 => "Z",
        27 => "a",
        28 => "b",
        29 => "c",
        30 => "d",
        31 => "e",
        32 => "f",
        33 => "g",
        34 => "h",
        35 => "i",
        36 => "j",
        37 => "k",
        38 => "l",
        39 => "m",
        40 => "n",
        41 => "o",
        42 => "p",
        43 => "q",
        44 => "r",
        45 => "s",
        46 => "t",
        47 => "u",
        48 => "v",
        49 => "w",
        50 => "x",
        51 => "y",
        52 => "z",
        53 => "0",
        54 => "1",
        55 => "2",
        56 => "3",
        57 => "4",
        58 => "5",
        59 => "6",
        60 => "7",
        61 => "8",
        62 => "9",
        _ => "Unknown"
    };
}

​switchexpression.jit.asm

; Core CLR 9.0.124.61010 on x64

C..ctor()
    L0000: ret

C.SwitchExpression(Int32)
    L0000: dec ecx
    L0002: cmp ecx, 0x3d
    L0005: ja short L001f
    L0007: mov eax, ecx
    L0009: lea rcx, [0x7ff8f19e04b8]
    L0010: mov ecx, [rcx+rax*4]
    L0013: lea rdx, [L0000]
    L001a: add rcx, rdx
    L001d: jmp rcx
    L001f: mov rax, 0x2a7eccb3f58
    L0029: mov rax, [rax]
    L002c: jmp L0470
    L0031: mov rax, 0x2a4a54bc5b8
    L003b: mov rax, [rax]
    L003e: jmp L0470
    L0043: mov rax, 0x2a4a54bc568
    L004d: mov rax, [rax]
    L0050: jmp L0470
    L0055: mov rax, 0x2a4a54bc5a8
    L005f: mov rax, [rax]
    L0062: jmp L0470
    L0067: mov rax, 0x2a4a54bc598
    L0071: mov rax, [rax]
    L0074: jmp L0470
    L0079: mov rax, 0x2a4a54bc588
    L0083: mov rax, [rax]
    L0086: jmp L0470
    L008b: mov rax, 0x2a4a54bb938
    L0095: mov rax, [rax]
    L0098: jmp L0470
    L009d: mov rax, 0x2a4a54bb958
    L00a7: mov rax, [rax]
    L00aa: jmp L0470
    L00af: mov rax, 0x2a4a54bb948
    L00b9: mov rax, [rax]
    L00bc: jmp L0470
    L00c1: mov rax, 0x2a4a536e028
    L00cb: mov rax, [rax]
    L00ce: jmp L0470
    L00d3: mov rax, 0x2a4a536e018
    L00dd: mov rax, [rax]
    L00e0: jmp L0470
    L00e5: mov rax, 0x2a7ec5a5328
    L00ef: mov rax, [rax]
    L00f2: jmp L0470
    L00f7: mov rax, 0x2a7f2257358
    L0101: mov rax, [rax]
    L0104: jmp L0470
    L0109: mov rax, 0x2a4a536c258
    L0113: mov rax, [rax]
    L0116: jmp L0470
    L011b: mov rax, 0x2a7f233f928
    L0125: mov rax, [rax]
    L0128: jmp L0470
    L012d: mov rax, 0x2a7f45f3828
    L0137: mov rax, [rax]
    L013a: jmp L0470
    L013f: mov rax, 0x2a4a5b437a8
    L0149: mov rax, [rax]
    L014c: jmp L0470
    L0151: mov rax, 0x2a7eccb50a8
    L015b: mov rax, [rax]
    L015e: jmp L0470
    L0163: mov rax, 0x2a4a54bcf88
    L016d: mov rax, [rax]
    L0170: jmp L0470
    L0175: mov rax, 0x2a7eccb5168
    L017f: mov rax, [rax]
    L0182: jmp L0470
    L0187: mov rax, 0x2a7f233f938
    L0191: mov rax, [rax]
    L0194: jmp L0470
    L0199: mov rax, 0x2a4a5b164c8
    L01a3: mov rax, [rax]
    L01a6: jmp L0470
    L01ab: mov rax, 0x2a7eccb5218
    L01b5: mov rax, [rax]
    L01b8: jmp L0470
    L01bd: mov rax, 0x2a7f2251598
    L01c7: mov rax, [rax]
    L01ca: jmp L0470
    L01cf: mov rax, 0x2a4a536ce98
    L01d9: mov rax, [rax]
    L01dc: jmp L0470
    L01e1: mov rax, 0x2a7f0e367b8
    L01eb: mov rax, [rax]
    L01ee: jmp L0470
    L01f3: mov rax, 0x2a7f8498f28
    L01fd: mov rax, [rax]
    L0200: jmp L0470
    L0205: mov rax, 0x2a7f8498f58
    L020f: mov rax, [rax]
    L0212: jmp L0470
    L0217: mov rax, 0x2a7f0e36748
    L0221: mov rax, [rax]
    L0224: jmp L0470
    L0229: mov rax, 0x2a7f22572e8
    L0233: mov rax, [rax]
    L0236: jmp L0470
    L023b: mov rax, 0x2a4a536cb58
    L0245: mov rax, [rax]
    L0248: jmp L0470
    L024d: mov rax, 0x2a4a5b46308
    L0257: mov rax, [rax]
    L025a: jmp L0470
    L025f: mov rax, 0x2a4a59f9228
    L0269: mov rax, [rax]
    L026c: jmp L0470
    L0271: mov rax, 0x2a4a536e1e8
    L027b: mov rax, [rax]
    L027e: jmp L0470
    L0283: mov rax, 0x2a4a5b16f48
    L028d: mov rax, [rax]
    L0290: jmp L0470
    L0295: mov rax, 0x2a4a54bcff8
    L029f: mov rax, [rax]
    L02a2: jmp L0470
    L02a7: mov rax, 0x2a7f0e36718
    L02b1: mov rax, [rax]
    L02b4: jmp L0470
    L02b9: mov rax, 0x2a7eccb72b8
    L02c3: mov rax, [rax]
    L02c6: jmp L0470
    L02cb: mov rax, 0x2a7f2253d98
    L02d5: mov rax, [rax]
    L02d8: jmp L0470
    L02dd: mov rax, 0x2a4a59fb0f8
    L02e7: mov rax, [rax]
    L02ea: jmp L0470
    L02ef: mov rax, 0x2a4a607f4c8
    L02f9: mov rax, [rax]
    L02fc: jmp L0470
    L0301: mov rax, 0x2a4a607f4d0
    L030b: mov rax, [rax]
    L030e: jmp L0470
    L0313: mov rax, 0x2a7ec5a40f8
    L031d: mov rax, [rax]
    L0320: jmp L0470
    L0325: mov rax, 0x2a7eccb7428
    L032f: mov rax, [rax]
    L0332: jmp L0470
    L0337: mov rax, 0x2a7eccb5798
    L0341: mov rax, [rax]
    L0344: jmp L0470
    L0349: mov rax, 0x2a4a5b148d8
    L0353: mov rax, [rax]
    L0356: jmp L0470
    L035b: mov rax, 0x2a4a607f4d8
    L0365: mov rax, [rax]
    L0368: jmp L0470
    L036d: mov rax, 0x2a7eccb56f8
    L0377: mov rax, [rax]
    L037a: jmp L0470
    L037f: mov rax, 0x2a4a5b17728
    L0389: mov rax, [rax]
    L038c: jmp L0470
    L0391: mov rax, 0x2a7eccb66e8
    L039b: mov rax, [rax]
    L039e: jmp L0470
    L03a3: mov rax, 0x2a7eccb6698
    L03ad: mov rax, [rax]
    L03b0: jmp L0470
    L03b5: mov rax, 0x2a7eccb60a8
    L03bf: mov rax, [rax]
    L03c2: jmp L0470
    L03c7: mov rax, 0x2a7f2257318
    L03d1: mov rax, [rax]
    L03d4: jmp L0470
    L03d9: mov rax, 0x2a4a607f4e0
    L03e3: mov rax, [rax]
    L03e6: jmp L0470
    L03eb: mov rax, 0x2a7f0e36d88
    L03f5: mov rax, [rax]
    L03f8: jmp short L0470
    L03fa: mov rax, 0x2a7ec5a1be8
    L0404: mov rax, [rax]
    L0407: jmp short L0470
    L0409: mov rax, 0x2a7ec688e58
    L0413: mov rax, [rax]
    L0416: jmp short L0470
    L0418: mov rax, 0x2a4a5b44148
    L0422: mov rax, [rax]
    L0425: jmp short L0470
    L0427: mov rax, 0x2a7ec5a5938
    L0431: mov rax, [rax]
    L0434: jmp short L0470
    L0436: mov rax, 0x2a7ec5a1c08
    L0440: mov rax, [rax]
    L0443: jmp short L0470
    L0445: mov rax, 0x2a7eccb7768
    L044f: mov rax, [rax]
    L0452: jmp short L0470
    L0454: mov rax, 0x2a4a607f4a8
    L045e: mov rax, [rax]
    L0461: jmp short L0470
    L0463: mov rax, 0x2a7ec6888e8
    L046d: mov rax, [rax]
    L0470: ret

​​.sharplab.json

{
    "version": 1,
    "target": "JIT ASM",
    "mode": "Release",
    "branch": "core-x64"
}