x86_64 backend: no encoding found when disabling sse

[leecannon]

Zig Version

0.15.0-dev.165+0bdc0bb53

Steps to Reproduce and Observed Behavior

$ touch empty.zig
$ ../zig/build/stage3/bin/zig build-exe -fno-llvm -fno-lld -mcpu baseline-sse+soft_float empty.zig
error(x86_64_encoder): no encoding found for: none pmovmskb r32 xmm none none
error(x86_64_encoder): no encoding found for: none stmxcsr m32 none none none
error(x86_64_encoder): no encoding found for: none pmovmskb eax xmm0 none none
error(x86_64_encoder): no encoding found for: none pmovmskb r32 xmm none none
error(x86_64_encoder): no encoding found for: none pmovmskb r32 xmm none none
error(x86_64_encoder): no encoding found for: none pmovmskb eax xmm0 none none
error(x86_64_encoder): no encoding found for: none pmovmskb eax xmm0 none none
error(x86_64_encoder): no encoding found for: none pmovmskb eax xmm0 none none
error(x86_64_encoder): no encoding found for: none pmovmskb eax xmm0 none none
error(x86_64_encoder): no encoding found for: none pmovmskb r32 xmm none none
error(x86_64_encoder): no encoding found for: none pmovmskb r32 xmm none none
error(x86_64_encoder): no encoding found for: none pmovmskb r32 xmm none none
error(x86_64_encoder): no encoding found for: none pmovmskb r32 xmm none none
error(x86_64_encoder): no encoding found for: none movlhps xmm0 xmm none none
error(x86_64_encoder): no encoding found for: none pmovmskb r32 xmm none none
/home/lee/src/zig/build/stage3/lib/zig/std/start.zig:643:46: error: root source file struct 'empty' has no member named 'main'
    const ReturnType = @typeInfo(@TypeOf(root.main)).@"fn".return_type.?;
                                         ~~~~^~~~~
empty.zig:1:1: note: struct declared here

^
/home/lee/src/zig/build/stage3/lib/zig/std/start.zig:616:20: note: called from here
    return callMain();
           ~~~~~~~~^~
/home/lee/src/zig/build/stage3/lib/zig/std/start.zig:571:36: note: called from here
    std.posix.exit(callMainWithArgs(argc, argv, envp));
                   ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~
referenced by:
    _start: /home/lee/src/zig/build/stage3/lib/zig/std/start.zig:464:40
    comptime: /home/lee/src/zig/build/stage3/lib/zig/std/start.zig:91:63
    2 reference(s) hidden; use '-freference-trace=4' to see all references
/home/lee/src/zig/build/stage3/lib/zig/ubsan_rt.zig:102:5: error: emit MIR failed: InvalidInstruction (Zig compiler bug)
    fn isMinusOne(value: Value) bool {
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/lee/src/zig/build/stage3/lib/zig/std/os/linux/x86_64.zig:385:1: error: emit MIR failed: InvalidInstruction (Zig compiler bug)
fn getContextInternal() callconv(.naked) usize {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/lee/src/zig/build/stage3/lib/zig/std/mem.zig:732:1: error: emit MIR failed: InvalidInstruction (Zig compiler bug)
fn eqlBytes(a: []const u8, b: []const u8) bool {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/lee/src/zig/build/stage3/lib/zig/std/fmt.zig:1181:5: error: emit MIR failed: InvalidInstruction (Zig compiler bug)
pub fn formatInt(
~~~~^~
/home/lee/src/zig/build/stage3/lib/zig/std/fmt.zig:1181:5: error: emit MIR failed: InvalidInstruction (Zig compiler bug)
pub fn formatInt(
~~~~^~
/home/lee/src/zig/build/stage3/lib/zig/std/compress/flate/bit_reader.zig:113:13: error: emit MIR failed: InvalidInstruction (Zig compiler bug)
        pub fn readF(self: *Self, comptime U: type, comptime how: u3) !U {
        ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/lee/src/zig/build/stage3/lib/zig/std/compress/flate/bit_reader.zig:113:13: error: emit MIR failed: InvalidInstruction (Zig compiler bug)
        pub fn readF(self: *Self, comptime U: type, comptime how: u3) !U {
        ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/lee/src/zig/build/stage3/lib/zig/std/compress/flate/bit_reader.zig:113:13: error: emit MIR failed: InvalidInstruction (Zig compiler bug)
        pub fn readF(self: *Self, comptime U: type, comptime how: u3) !U {
        ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/lee/src/zig/build/stage3/lib/zig/std/compress/flate/bit_reader.zig:113:13: error: emit MIR failed: InvalidInstruction (Zig compiler bug)
        pub fn readF(self: *Self, comptime U: type, comptime how: u3) !U {
        ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/lee/src/zig/build/stage3/lib/zig/std/fmt/format_float.zig:361:5: error: emit MIR failed: InvalidInstruction (Zig compiler bug)
pub fn binaryToDecimal(comptime T: type, bits: T, mantissa_bits: std.math.Log2Int(T), exponent_bits: u5, explicit_leading_bit: bool, comptime tables: anytype) FloatDecimal(T) {
~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/lee/src/zig/build/stage3/lib/zig/std/math.zig:1209:5: error: emit MIR failed: InvalidInstruction (Zig compiler bug)
pub fn ceilPowerOfTwo(comptime T: type, value: T) (error{Overflow}!T) {
~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/lee/src/zig/build/stage3/lib/zig/std/fmt/format_float.zig:570:1: error: emit MIR failed: InvalidInstruction (Zig compiler bug)
fn multipleOfPowerOf2(value: anytype, p: u32) bool {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/lee/src/zig/build/stage3/lib/zig/std/fmt/format_float.zig:91:1: error: emit MIR failed: InvalidInstruction (Zig compiler bug)
fn copySpecialStr(buf: []u8, f: anytype) []const u8 {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/lee/src/zig/build/stage3/lib/zig/std/fmt/format_float.zig:552:1: error: emit MIR failed: InvalidInstruction (Zig compiler bug)
fn pow5Factor(value_: anytype) u32 {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/lee/src/zig/build/stage3/lib/zig/std/fmt/format_float.zig:122:1: error: emit MIR failed: InvalidInstruction (Zig compiler bug)
fn isPowerOf10(n_: u128) bool {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Adding -sse2 results in a seg fault.

$ ../zig/build/stage3/bin/zig build-exe -fno-llvm -fno-lld -mcpu baseline-sse-sse2+soft_float empty.zig
error(x86_64_encoder): no encoding found for: none stmxcsr m32 none none none
error(x86_64_encoder): no encoding found for: none movups xmm0 m128 none none
[1]    156137 segmentation fault (core dumped)  ../zig/build/stage3/bin/zig build-exe -fno-llvm -fno-lld -mcpu  empty.zig

Expected Behavior

Compile error about missing main.

$ ../zig/build/stage3/bin/zig build-exe -mcpu baseline-sse+soft_float empty.zig
/home/lee/src/zig/build/stage3/lib/zig/std/start.zig:643:46: error: root source file struct 'empty' has no member named 'main'
    const ReturnType = @typeInfo(@TypeOf(root.main)).@"fn".return_type.?;
                                         ~~~~^~~~~
empty.zig:1:1: note: struct declared here

^
/home/lee/src/zig/build/stage3/lib/zig/std/start.zig:616:20: note: called from here
    return callMain();
           ~~~~~~~~^~
/home/lee/src/zig/build/stage3/lib/zig/std/start.zig:571:36: note: called from here
    std.posix.exit(callMainWithArgs(argc, argv, envp));
                   ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~
referenced by:
    _start: /home/lee/src/zig/build/stage3/lib/zig/std/start.zig:464:40
    comptime: /home/lee/src/zig/build/stage3/lib/zig/std/start.zig:91:63
    2 reference(s) hidden; use '-freference-trace=4' to see all references