[LLVMbugs] [Bug 22854] Different encoding using direct object emission

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=22854

Russell Gallop <russell_gallop at sn.scee.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |---

--- Comment #4 from Russell Gallop <russell_gallop at sn.scee.net> ---
Thanks for the fix Rafael.

It looks like that has improved the add encoding but I still get longer
encodings for the compare and jump instructions:

test.o:     file format elf64-x86-64


Disassembly of section .text:

0000000000000000 <_Z3foov>:
   0:   55                      push   %rbp
   1:   48 89 e5                mov    %rsp,%rbp
   4:   c7 45 fc 00 00 00 00    movl   $0x0,-0x4(%rbp)
   b:   81 7d fc 01 00 00 00    cmpl   $0x1,-0x4(%rbp)
  12:   0f 84 13 00 00 00       je     2b <_Z3foov+0x2b>
  18:   e9 00 00 00 00          jmpq   1d <_Z3foov+0x1d>
  1d:   8b 45 fc                mov    -0x4(%rbp),%eax
  20:   83 c0 01                add    $0x1,%eax
  23:   89 45 fc                mov    %eax,-0x4(%rbp)
  26:   e9 e0 ff ff ff          jmpq   b <_Z3foov+0xb>
  2b:   5d                      pop    %rbp
  2c:   c3                      retq

I've reopened but can submit this as a separate bug if you think that would be
best.

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