[Bug rtl-optimization/20586] bootstrap comparision fails with -funroll-loops.

[pluto at pld-linux dot org]

------- Additional Comments From pluto at pld-linux dot org  2005-04-11 13:08 -------
Problem still exists in 4.0.0-20050409 snap.
I've checked the i386.o and caller-save.o from stage2/3.
They have the same size but diff. instructions in several places.

--- stage2-i386.o.txt     2005-04-11 14:42:40.000000000 +0200
+++ stage3-i386.o.txt     2005-04-11 14:42:46.000000000 +0200
@@ -1,5 +1,5 @@

-stage2-i386.o:     file format elf32-i386
+stage3-i386.o:     file format elf32-i386

 Disassembly of section .text:

// split_di function

@@ -4948,7 +4948,7 @@
     4461:      89 42 fc                mov    %eax,0xfffffffc(%edx)
     4464:      8b 44 24 20             mov    0x20(%esp),%eax
     4468:      83 c0 01                add    $0x1,%eax
-    446b:      89 44 24 1c             mov    %eax,0x1c(%esp)
+    446b:      89 44 24 18             mov    %eax,0x18(%esp)
     446f:      8b 7c 24 24             mov    0x24(%esp),%edi
     4473:      83 ef 04                sub    $0x4,%edi
     4476:      89 7c 24 24             mov    %edi,0x24(%esp)
@@ -4956,7 +4956,7 @@
     447d:      89 f5                   mov    %esi,%ebp
     447f:      8b 54 24 28             mov    0x28(%esp),%edx
     4483:      83 ea 04                sub    $0x4,%edx
-    4486:      89 54 24 18             mov    %edx,0x18(%esp)
+    4486:      89 54 24 1c             mov    %edx,0x1c(%esp)
     448a:      8b 5a fc                mov    0xfffffffc(%edx),%ebx
     448d:      66 83 3b 27             cmpw   $0x27,(%ebx)
     4491:      0f 84 fe 00 00 00       je     4595 <split_di+0x25b>
@@ -4984,13 +4984,13 @@
     44e8:      c7 04 24 0c 00 00 00    movl   $0xc,(%esp)
     44ef:      e8 fc ff ff ff          call   44f0 <split_di+0x1b6>
     44f4:      89 47 fc                mov    %eax,0xfffffffc(%edi)
-    44f7:      8b 54 24 1c             mov    0x1c(%esp),%edx
+    44f7:      8b 54 24 18             mov    0x18(%esp),%edx
     44fb:      83 c2 01                add    $0x1,%edx
     44fe:      89 54 24 20             mov    %edx,0x20(%esp)
     4502:      83 ef 04                sub    $0x4,%edi
     4505:      89 7c 24 24             mov    %edi,0x24(%esp)
     4509:      8d 6e fc                lea    0xfffffffc(%esi),%ebp
-    450c:      8b 44 24 18             mov    0x18(%esp),%eax
+    450c:      8b 44 24 1c             mov    0x1c(%esp),%eax
     4510:      83 e8 04                sub    $0x4,%eax
     4513:      89 44 24 28             mov    %eax,0x28(%esp)
     4517:      8b 44 24 44             mov    0x44(%esp),%eax

// split_ti function

@@ -5144,7 +5144,7 @@
     474e:      89 42 fc                mov    %eax,0xfffffffc(%edx)
     4751:      8b 44 24 20             mov    0x20(%esp),%eax
     4755:      83 c0 01                add    $0x1,%eax
-    4758:      89 44 24 1c             mov    %eax,0x1c(%esp)
+    4758:      89 44 24 18             mov    %eax,0x18(%esp)
     475c:      8d 7d fc                lea    0xfffffffc(%ebp),%edi
     475f:      89 fd                   mov    %edi,%ebp
     4761:      8b 74 24 24             mov    0x24(%esp),%esi
@@ -5152,7 +5152,7 @@
     4768:      89 74 24 24             mov    %esi,0x24(%esp)
     476c:      8b 54 24 28             mov    0x28(%esp),%edx
     4770:      83 ea 04                sub    $0x4,%edx
-    4773:      89 54 24 18             mov    %edx,0x18(%esp)
+    4773:      89 54 24 1c             mov    %edx,0x1c(%esp)
     4777:      8b 5a fc                mov    0xfffffffc(%edx),%ebx
     477a:      66 83 3b 27             cmpw   $0x27,(%ebx)
     477e:      0f 84 e4 00 00 00       je     4868 <split_ti+0x20d>
@@ -5172,13 +5172,13 @@
     47bb:      c7 04 24 0d 00 00 00    movl   $0xd,(%esp)
     47c2:      e8 fc ff ff ff          call   47c3 <split_ti+0x168>
     47c7:      89 46 fc                mov    %eax,0xfffffffc(%esi)
-    47ca:      8b 54 24 1c             mov    0x1c(%esp),%edx
+    47ca:      8b 54 24 18             mov    0x18(%esp),%edx
     47ce:      83 c2 01                add    $0x1,%edx
     47d1:      89 54 24 20             mov    %edx,0x20(%esp)
     47d5:      8d 6f fc                lea    0xfffffffc(%edi),%ebp
     47d8:      83 ee 04                sub    $0x4,%esi
     47db:      89 74 24 24             mov    %esi,0x24(%esp)
-    47df:      8b 44 24 18             mov    0x18(%esp),%eax
+    47df:      8b 44 24 1c             mov    0x1c(%esp),%eax
     47e3:      83 e8 04                sub    $0x4,%eax
     47e6:      89 44 24 28             mov    %eax,0x28(%esp)
     47ea:      8b 44 24 44             mov    0x44(%esp),%eax


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20586