compiler crash multiplying zero vector

[Pyrolistical]

Zig Version

0.10.0-dev.4217+9d8cdb855

Steps to Reproduce

1. zig build-exe the following test.zig

pub fn main() !u8 {
    const v: @Vector(2, u8) = .{ 0, 0 };
    const v2 = v * v;

    return v2[0];
}

Expected Behavior

Builds exe

Actual Behavior

Crashes

$ zig build-exe test.zig
zsh: illegal hardware instruction  zig build-exe test.zig

Reproduced on x86_64-macos.12.6 if that matters.

[Pyrolistical]

I ran into this when using https://github.com/michal-z/zig-gamedev/blob/main/libs/zmath/src/zmath.zig#L1447

The workaround for zig-gamedev is to use @mulAdd(T, v0, v1, v2) instead.

[topolarity]

Hmm, I hit a crash if that is evaluated at comptime, but if v is var, then the program runs fine.

Were you calling mulAdd at comptime?

[Pyrolistical]

Yes I was calling mulAdd at comptime.

[topolarity]

Great, sounds like the same bug - I'll roll this together with some other small fixes tomorrow.