Bad zig asm output | Zig Programming Language | Page 1

So I'm trying to messe with x86 float control register using the ldmxcsr instruction like so:

void square(int mode) {
    asm volatile ("ldmxcsr %[b]" :: [b] "m" (mode));
}

This c snippet compiles just fine using gcc and clang.

But with zig:

pub export fn restoreFloat(mode: u32) void {
    asm volatile ("ldmxcsr %[b]" :: [b] "m" (mode));
}

The output of the function above is just crazy, it first stores edi to an offset into the stack and uses a diffrent offset in the acctual ldmxcsr instruction

I can get a sane assembly output with this:

pub export fn restoreFloat(mode: u32) void {
    var temp: u32 = undefined;
    asm volatile (
        \\movl    %[mode], %[temp]
        \\ldmxcsr %[temp]
        : [temp] "=m" (temp)
        : [mode] "r" (mode)
    );
}

Heres the output:
https://godbolt.org/z/WEGK8aqv9

#Bad zig asm output