[Bug bootstrap/41241] [4.5 regression] bootstrap comparison failure

[rguenth at gcc dot gnu dot org]

------- Comment #4 from rguenth at gcc dot gnu dot org  2009-09-03 13:06 -------
I get different .text sizes for _umoddi3_s.o:

-  Start of section headers:          676 (bytes into file)
+  Start of section headers:          684 (bytes into file)
...
-  [ 1] .text             PROGBITS        00000000 000040 000148 00  AX  0   0
1
6
+  [ 1] .text             PROGBITS        00000000 000040 000150 00  AX  0   0
1
6

which amounts to different asm:

@@ -11,129 +11,135 @@
    4:  56                      push   %esi
    5:  83 ec 20                sub    $0x20,%esp
    8:  8b 7d 14                mov    0x14(%ebp),%edi
-   b:  8b 45 08                mov    0x8(%ebp),%eax
+   b:  8b 55 08                mov    0x8(%ebp),%edx
    e:  8b 4d 10                mov    0x10(%ebp),%ecx
   11:  8b 75 0c                mov    0xc(%ebp),%esi
   14:  85 ff                   test   %edi,%edi
-  16:  89 45 e8                mov    %eax,-0x18(%ebp)
-  19:  89 4d f4                mov    %ecx,-0xc(%ebp)
-  1c:  89 45 f0                mov    %eax,-0x10(%ebp)
-  1f:  89 f2                   mov    %esi,%edx
+  16:  89 d0                   mov    %edx,%eax
+  18:  89 4d f4                mov    %ecx,-0xc(%ebp)
+  1b:  89 55 f0                mov    %edx,-0x10(%ebp)
+  1e:  89 75 ec                mov    %esi,-0x14(%ebp)
   21:  75 15                   jne    0x38
   23:  39 f1                   cmp    %esi,%ecx
-  25:  76 49                   jbe    0x70
-  27:  f7 f1                   div    %ecx
-  29:  89 d0                   mov    %edx,%eax
-  2b:  31 d2                   xor    %edx,%edx
-  2d:  83 c4 20                add    $0x20,%esp
-  30:  5e                      pop    %esi
-  31:  5f                      pop    %edi
-  32:  5d                      pop    %ebp
-  33:  c3                      ret    
-  34:  8d 74 26 00             lea    0x0(%esi,%eiz,1),%esi
+  25:  76 51                   jbe    0x78
+  27:  89 f2                   mov    %esi,%edx
+  29:  f7 f1                   div    %ecx
+  2b:  89 d0                   mov    %edx,%eax
+  2d:  31 d2                   xor    %edx,%edx
+  2f:  83 c4 20                add    $0x20,%esp
+  32:  5e                      pop    %esi
+  33:  5f                      pop    %edi
+  34:  5d                      pop    %ebp
+  35:  c3                      ret    
+  36:  66 90                   xchg   %ax,%ax
   38:  39 f7                   cmp    %esi,%edi
-  3a:  77 54                   ja     0x90
-  3c:  0f bd c7                bsr    %edi,%eax
-  3f:  83 f0 1f                xor    $0x1f,%eax
-  42:  89 45 ec                mov    %eax,-0x14(%ebp)
-  45:  75 59                   jne    0xa0
+  3a:  77 5c                   ja     0x98
+  3c:  0f bd d7                bsr    %edi,%edx
+  3f:  83 f2 1f                xor    $0x1f,%edx
+  42:  89 55 e8                mov    %edx,-0x18(%ebp)
+  45:  75 61                   jne    0xa8
   47:  8b 4d f0                mov    -0x10(%ebp),%ecx
   4a:  39 4d f4                cmp    %ecx,-0xc(%ebp)
-  4d:  0f 96 c1                setbe  %cl
-  50:  39 f7                   cmp    %esi,%edi
-  52:  0f 92 c0                setb   %al
-  55:  08 c1                   or     %al,%cl
-  57:  74 0b                   je     0x64
-  59:  8b 75 f0                mov    -0x10(%ebp),%esi
-  5c:  2b 75 f4                sub    -0xc(%ebp),%esi
-  5f:  19 fa                   sbb    %edi,%edx
-  61:  89 75 f0                mov    %esi,-0x10(%ebp)
-  64:  8b 45 f0                mov    -0x10(%ebp),%eax
-  67:  83 c4 20                add    $0x20,%esp
-  6a:  5e                      pop    %esi
-  6b:  5f                      pop    %edi
-  6c:  5d                      pop    %ebp
-  6d:  c3                      ret    
-  6e:  66 90                   xchg   %ax,%ax
-  70:  85 c9                   test   %ecx,%ecx
-  72:  75 0b                   jne    0x7f
-  74:  b8 01 00 00 00          mov    $0x1,%eax
-  79:  31 d2                   xor    %edx,%edx
-  7b:  f7 f1                   div    %ecx
-  7d:  89 c1                   mov    %eax,%ecx
-  7f:  89 f0                   mov    %esi,%eax
+  4d:  0f 96 c2                setbe  %dl
+  50:  3b 7d ec                cmp    -0x14(%ebp),%edi
+  53:  0f 92 c0                setb   %al
+  56:  08 c2                   or     %al,%dl
+  58:  74 0e                   je     0x68
+  5a:  8b 45 ec                mov    -0x14(%ebp),%eax
+  5d:  2b 4d f4                sub    -0xc(%ebp),%ecx
+  60:  19 f8                   sbb    %edi,%eax
+  62:  89 4d f0                mov    %ecx,-0x10(%ebp)
+  65:  89 45 ec                mov    %eax,-0x14(%ebp)
+  68:  8b 45 f0                mov    -0x10(%ebp),%eax
+  6b:  8b 55 ec                mov    -0x14(%ebp),%edx
+  6e:  83 c4 20                add    $0x20,%esp

...


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41241