LLVM Backend panics when misusing #simd literals

[MrMetube]

Context

    Odin:    dev-2026-02:b942f72cb
    OS:      Windows 11 Professional (version: 25H2), build 26200.7840
    CPU:     12th Gen Intel(R) Core(TM) i5-12600
    RAM:     32540 MiB
    Backend: LLVM 20.1.0

Expected Behavior

Either allow it and upcast/widen the extracted lane or report that the types cannot be compared. Whatever fits with normal behaviour.

Current Behavior

The llvm backend panics.

Failure Information (for bugs)

<odin root>\src\llvm_backend_expr.cpp(3681): Panic: Unknown handled type: #simd[4]u32 -> #simd[4]u32

Steps to Reproduce

odin build this repro code.

package repro

import "core:simd"
import "core:fmt"

main :: proc () {
    V :: #simd [4] u32
    
    // these work
    a := simd.extract(cast(V) 0, 1) == cast(V) 0
    fmt.print(a)
    
    b: V
    c: V
    _ = simd.extract(b, 1) == c
    
    // these all panic
    _ = simd.extract(b, 1) == cast(V) 0
    
    d :: cast(V) 0
    _ = simd.extract(b, 1) == d
    
    e : V : 0
    _ = simd.extract(b, 1) == e
}