Demonstration of if/else jump optimization (removes extra jump)

.asm

i32 sign(i32 number) {
    i32 result;
    if (number < 0) result = 0-1;
    else if (number > 0) result = 1;
    else result = 0;
    return result;
}
 
83 F9 00 0F 8C 05 00 00 00 E9 0A 00 00 00 B8 FF
FF FF FF E9 1D 00 00 00 83 F9 00 0F 8F 05 00 00
00 E9 0A 00 00 00 B8 01 00 00 00 E9 05 00 00 00
B8 00 00 00 00 C3
0:  83 f9 00                cmp    ecx,0x0        ; compare
3:  0f 8c 05 00 00 00       jl     0xe            ; jump to @then1 if true
9:  e9 0a 00 00 00          jmp    0x18           ; jump to @else1
e:  b8 ff ff ff ff          mov    eax,0xffffffff ; @then1
13: e9 1d 00 00 00          jmp    0x35           ;
18: 83 f9 00                cmp    ecx,0x0        ; @else1
1b: 0f 8f 05 00 00 00       jg     0x26           ; jump to @then2 if true
21: e9 0a 00 00 00          jmp    0x30           ; jump to @else2
26: b8 01 00 00 00          mov    eax,0x1        ; @then2
2b: e9 05 00 00 00          jmp    0x35           ;
30: b8 00 00 00 00          mov    eax,0x0        ; @else2
35: c3                      ret                   ;
 
// With condition inversion and then/else inversion
83 F9 00 0F 8D 0A 00 00 00 B8 FF FF FF FF E9 18
00 00 00 83 F9 00 0F 8E 0A 00 00 00 B8 01 00 00
00 E9 05 00 00 00 B8 00 00 00 00 C3
0:  83 f9 00                cmp    ecx,0x0        ; compare
3:  0f 8d 0a 00 00 00       jge    0x13           ; jump to @else1 if false
9:  b8 ff ff ff ff          mov    eax,0xffffffff ; @then1 (no jmp because it is next instruction)
e:  e9 18 00 00 00          jmp    0x2b           ;
13: 83 f9 00                cmp    ecx,0x0        ; @else1
16: 0f 8e 0a 00 00 00       jle    0x26           ; jump to @else2 if false
1c: b8 01 00 00 00          mov    eax,0x1        ; @then2 (no jmp because it is next instruction)
21: e9 05 00 00 00          jmp    0x2b           ;
26: b8 00 00 00 00          mov    eax,0x0        ; @else2
2b: c3                      ret                   ;