[Bug gas/12049] Unnecessary relaxation

[hjl.tools at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12049

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |WONTFIX

--- Comment #6 from H.J. Lu <hjl.tools at gmail dot com> 2010-10-14 13:37:11 
UTC ---
This is due to relaxation between alignment directives and branch
instructions. There is no easy way to fix all cases.  I checked in a
patch to support .d32 suffix to force 32bit displacement. You can do

address@hidden pr12049]$ cat test3.s
        .fill 56, 1, 0x90
    jne.d32 .LBB0_43
        .fill 10, 1, 0x90
    jne .LBB0_43
        .fill 5, 1, 0x90
    .align 16, 0x90
        .fill 118, 1, 0x90
.LBB0_43:
address@hidden pr12049]$ ./as -o test3.o test3.s
address@hidden pr12049]$ objdump -dw test3.o

test3.o:     file format elf64-x86-64


Disassembly of section .text:

0000000000000000 <.text>:
   0:    90                       nop
   1:    90                       nop
   2:    90                       nop
   3:    90                       nop
   4:    90                       nop
   5:    90                       nop
   6:    90                       nop
   7:    90                       nop
   8:    90                       nop
   9:    90                       nop
   a:    90                       nop
   b:    90                       nop
   c:    90                       nop
   d:    90                       nop
   e:    90                       nop
   f:    90                       nop
  10:    90                       nop
  11:    90                       nop
  12:    90                       nop
  13:    90                       nop
  14:    90                       nop
  15:    90                       nop
  16:    90                       nop
  17:    90                       nop
  18:    90                       nop
  19:    90                       nop
  1a:    90                       nop
  1b:    90                       nop
  1c:    90                       nop
  1d:    90                       nop
  1e:    90                       nop
  1f:    90                       nop
  20:    90                       nop
  21:    90                       nop
  22:    90                       nop
  23:    90                       nop
  24:    90                       nop
  25:    90                       nop
  26:    90                       nop
  27:    90                       nop
  28:    90                       nop
  29:    90                       nop
  2a:    90                       nop
  2b:    90                       nop
  2c:    90                       nop
  2d:    90                       nop
  2e:    90                       nop
  2f:    90                       nop
  30:    90                       nop
  31:    90                       nop
  32:    90                       nop
  33:    90                       nop
  34:    90                       nop
  35:    90                       nop
  36:    90                       nop
  37:    90                       nop
  38:    0f 85 88 00 00 00        jne    0xc6
  3e:    90                       nop
  3f:    90                       nop
  40:    90                       nop
  41:    90                       nop
  42:    90                       nop
  43:    90                       nop
  44:    90                       nop
  45:    90                       nop
  46:    90                       nop
  47:    90                       nop
  48:    75 7c                    jne    0xc6
  4a:    90                       nop
  4b:    90                       nop
  4c:    90                       nop
  4d:    90                       nop
  4e:    90                       nop
  4f:    90                       nop
  50:    90                       nop
  51:    90                       nop
  52:    90                       nop
  53:    90                       nop
  54:    90                       nop
  55:    90                       nop
  56:    90                       nop
  57:    90                       nop
  58:    90                       nop
  59:    90                       nop
  5a:    90                       nop
  5b:    90                       nop
  5c:    90                       nop
  5d:    90                       nop
  5e:    90                       nop
  5f:    90                       nop
  60:    90                       nop
  61:    90                       nop
  62:    90                       nop
  63:    90                       nop
  64:    90                       nop
  65:    90                       nop
  66:    90                       nop
  67:    90                       nop
  68:    90                       nop
  69:    90                       nop
  6a:    90                       nop
  6b:    90                       nop
  6c:    90                       nop
  6d:    90                       nop
  6e:    90                       nop
  6f:    90                       nop
  70:    90                       nop
  71:    90                       nop
  72:    90                       nop
  73:    90                       nop
  74:    90                       nop
  75:    90                       nop
  76:    90                       nop
  77:    90                       nop
  78:    90                       nop
  79:    90                       nop
  7a:    90                       nop
  7b:    90                       nop
  7c:    90                       nop
  7d:    90                       nop
  7e:    90                       nop
  7f:    90                       nop
  80:    90                       nop
  81:    90                       nop
  82:    90                       nop
  83:    90                       nop
  84:    90                       nop
  85:    90                       nop
  86:    90                       nop
  87:    90                       nop
  88:    90                       nop
  89:    90                       nop
  8a:    90                       nop
  8b:    90                       nop
  8c:    90                       nop
  8d:    90                       nop
  8e:    90                       nop
  8f:    90                       nop
  90:    90                       nop
  91:    90                       nop
  92:    90                       nop
  93:    90                       nop
  94:    90                       nop
  95:    90                       nop
  96:    90                       nop
  97:    90                       nop
  98:    90                       nop
  99:    90                       nop
  9a:    90                       nop
  9b:    90                       nop
  9c:    90                       nop
  9d:    90                       nop
  9e:    90                       nop
  9f:    90                       nop
  a0:    90                       nop
  a1:    90                       nop
  a2:    90                       nop
  a3:    90                       nop
  a4:    90                       nop
  a5:    90                       nop
  a6:    90                       nop
  a7:    90                       nop
  a8:    90                       nop
  a9:    90                       nop
  aa:    90                       nop
  ab:    90                       nop
  ac:    90                       nop
  ad:    90                       nop
  ae:    90                       nop
  af:    90                       nop
  b0:    90                       nop
  b1:    90                       nop
  b2:    90                       nop
  b3:    90                       nop
  b4:    90                       nop
  b5:    90                       nop
  b6:    90                       nop
  b7:    90                       nop
  b8:    90                       nop
  b9:    90                       nop
  ba:    90                       nop
  bb:    90                       nop
  bc:    90                       nop
  bd:    90                       nop
  be:    90                       nop
  bf:    90                       nop
  c0:    90                       nop
  c1:    90                       nop
  c2:    90                       nop
  c3:    90                       nop
  c4:    90                       nop
  c5:    90                       nop
address@hidden pr12049]$

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