[nix-shell:~/dev/zig/build-release]$ cat test.zir
@void = primitive(void)
@u32 = primitive(u32)
@fnty = fntype([@u32, @u32], @void)

@0 = str("entry")
@1 = export(@0, "entry")

@entry = fn(@fnty, {
  %0 = arg(0)
  %1 = arg(1)
  %2 = add(%0, %1)
  %3 = int(7)
  %4 = block("if", {
    %neq = cmp(%2, neq, %3)
    %5 = condbr(%neq, {
      %6 = unreachable()
    }, {
      %7 = breakvoid("if")
    })
  })
  %11 = returnvoid()
})

[nix-shell:~/dev/zig/build-release]$ readelf -s test.o

Symbol table '.symtab' contains 5 entries:
   Num:    Value          Size Type    Bind   Vis      Ndx Name
     0: 0000000000000000     0 NOTYPE  LOCAL  DEFAULT  UND 
     1: 0000000008000000     6 OBJECT  LOCAL  DEFAULT    2 0$0
     2: 0000000008000008     8 OBJECT  LOCAL  DEFAULT    2 0
     3: 0000000008000012    20 FUNC    LOCAL  DEFAULT    2 entry
     4: 0000000008000012    20 FUNC    GLOBAL DEFAULT    2 entry

[nix-shell:~/dev/zig/build-release]$ objdump -d test.o

test.o:     file format elf64-x86-64


Disassembly of section .text:

0000000008000000 <0$0-0x8000000>:
 8000000:	65 6e                	outsb  %gs:(%rsi),(%dx)
 8000002:	74 72                	je     8000076 <0$0-0x7ffff8a>
 8000004:	79 00                	jns    8000006 <0$0-0x7fffffa>
 8000006:	00 00                	add    %al,(%rax)
 8000008:	00 00                	add    %al,(%rax)
 800000a:	00 08                	add    %cl,(%rax)
 800000c:	00 00                	add    %al,(%rax)
 800000e:	00 00                	add    %al,(%rax)
 8000010:	00 00                	add    %al,(%rax)
 8000012:	48 01 f7             	add    %rsi,%rdi
 8000015:	48 83 ff 07          	cmp    $0x7,%rdi
 8000019:	0f 84 01 00 00 00    	je     8000020 <0$0-0x7ffffe0>
 800001f:	cc                   	int3   
 8000020:	e9 00 00 00 00       	jmpq   8000025 <0$0-0x7ffffdb>
 8000025:	c3                   	retq