selfhosted x86_64: no encoding found for: none imul r8 r8 none none

[NicoElbers]

Zig Version

0.14.0-dev.2198+e5f5229fd

Steps to Reproduce and Observed Behavior

imulr8r8.zig:

export fn foo(a: i8) i8 {
    return @mod(a, 1);
}

run zig build-lib -fno-llvm -fno-lld imulr8r8.zig

observe:

error(x86_64_encoder): no encoding found for: none imul r8 r8 none none
imulr8r8.zig:1:8: error: CodeGen failed to find a viable instruction. This is a bug in the Zig compiler.
export fn foo(a: i8) i8 {
~~~~~~~^~~~~~~~~~~~~~~~

Expected Behavior

That this function compiles