Faster:
if (a) {stuff1 + morestuff} else else {stuff2 + morestuff} eof

// Stuff1 end
  4ff156:       0f 29 a4 24 90 00 00    movaps %xmm4,0x90(%rsp)
  4ff15d:       00
  4ff15e:       0f 29 9c 24 a0 00 00    movaps %xmm3,0xa0(%rsp)
  4ff165:       00
  4ff166:       0f 29 8c 24 00 01 00    movaps %xmm1,0x100(%rsp)
  4ff16d:       00
  4ff16e:       0f 29 94 24 b0 00 00    movaps %xmm2,0xb0(%rsp)
  4ff175:       00
  4ff176:       0f 29 8c 24 c0 00 00    movaps %xmm1,0xc0(%rsp)
  4ff17d:       00
  4ff17e:       0f 84 7b f6 ff ff       je     4fe7ff
// Morestuff
  4ff184:       0f 1f 40 00             nopl   0x0(%rax)
  4ff188:       48 8b 3b                mov    (%rbx),%rdi
  4ff18b:       4c 89 e9                mov    %r13,%rcx
  4ff18e:       4c 89 f2                mov    %r14,%rdx
  4ff191:       41 0f 28 04 24          movaps (%r12),%xmm0
  4ff196:       48 89 ee                mov    %rbp,%rsi
  4ff199:       48 83 c3 08             add    $0x8,%rbx
  4ff19d:       48 8b 07                mov    (%rdi),%rax
  4ff1a0:       ff 90 d8 00 00 00       callq  *0xd8(%rax)
  4ff1a6:       48 3b 1d fb b6 28 00    cmp    0x28b6fb(%rip),%rbx
  4ff1ad:       75 d9                   jne    4ff188
  4ff1af:       e9 4b f6 ff ff          jmpq   4fe7ff

=============================================================
Slower:
if (a) {stuff1} else {stuff2} morestuff eof

// Stuff 1 end
  4ff130:       0f 29 a4 24 90 00 00    movaps %xmm4,0x90(%rsp)
  4ff137:       00
  4ff138:       0f 29 9c 24 a0 00 00    movaps %xmm3,0xa0(%rsp)
  4ff13f:       00
  4ff140:       0f 29 8c 24 00 01 00    movaps %xmm1,0x100(%rsp)
  4ff147:       00
  4ff148:       0f 29 94 24 b0 00 00    movaps %xmm2,0xb0(%rsp)
  4ff14f:       00
  4ff150:       0f 29 8c 24 c0 00 00    movaps %xmm1,0xc0(%rsp)
  4ff157:       00
  4ff158:       e9 54 f6 ff ff          jmpq   4fe7b1
// jmpq to morestuff I presume ^