Bootstrap comparison failure on i686-linux

[Andreas Jaeger <aj at suse dot de>]

Bootstrapping gcc CVS current (checked out around 18:00 UTC 6th
January 2001) with gcc 2.95.2 on i686-linux-gnu with glibc 2.2 gives a
comparsion failure on haifa-sched.o:
[...]
Bootstrap comparison failure!
haifa-sched.o differs
make[1]: *** [compare] Error 1

I've run objdump -xD on both haifa-sched.o files and diffed the
output.  The difference is just register renaming.  How can this
happen?  Any ideas?

My configure command is:
/cvs/gcc/configure --prefix=/opt/gcc-2.97.test --enable-shared \
         --enable-threads=posix \
         --with-gnu-as --with-gnu-ld --disable-nls --with-system-zlib \
         --enable-languages=c,objc,c++,f77

And I run "make bootstrap" - until I got the above failure.  I didn't
pass any CFLAGS.

Andreas

--- h1	Sat Jan  6 20:10:38 2001
+++ h2	Sat Jan  6 20:10:35 2001
@@ -1,6 +1,6 @@
 
-haifa-sched.o:     file format elf32-i386
-haifa-sched.o
+stage2/haifa-sched.o:     file format elf32-i386
+stage2/haifa-sched.o
 architecture: i386, flags 0x00000011:
 HAS_RELOC, HAS_SYMS
 start address 0x0000000000000000
@@ -2757,7 +2757,7 @@
     1b4c:	8d 04 8d 00 00 00 00 	lea    0x0(,%ecx,4),%eax
     1b53:	29 c2                	sub    %eax,%edx
     1b55:	83 f9 02             	cmp    $0x2,%ecx
-    1b58:	8d 5a 04             	lea    0x4(%edx),%ebx
+    1b58:	8d 72 04             	lea    0x4(%edx),%esi
     1b5b:	0f 84 34 05 00 00    	je     2095 <schedule_block+0x705>
     1b61:	83 f9 02             	cmp    $0x2,%ecx
     1b64:	7e 14                	jle    1b7a <schedule_block+0x1ea>
@@ -2765,7 +2765,7 @@
 			1b67: R_386_32	.text
     1b6b:	6a 04                	push   $0x4
     1b6d:	51                   	push   %ecx
-    1b6e:	53                   	push   %ebx
+    1b6e:	56                   	push   %esi
     1b6f:	e8 fc ff ff ff       	call   1b70 <schedule_block+0x1e0>
 			1b70: R_386_PC32	qsort
     1b74:	8b 4d e4             	mov    0xffffffe4(%ebp),%ecx
@@ -3225,27 +3225,27 @@
     2090:	e9 4b fa ff ff       	jmp    1ae0 <schedule_block+0x150>
     2095:	8b 42 08             	mov    0x8(%edx),%eax
     2098:	31 ff                	xor    %edi,%edi
-    209a:	89 de                	mov    %ebx,%esi
+    209a:	89 f3                	mov    %esi,%ebx
     209c:	89 45 c4             	mov    %eax,0xffffffc4(%ebp)
     209f:	90                   	nop    
     20a0:	85 ff                	test   %edi,%edi
     20a2:	78 21                	js     20c5 <schedule_block+0x735>
     20a4:	83 ec 08             	sub    $0x8,%esp
-    20a7:	8d 45 c4             	lea    0xffffffc4(%ebp),%eax
-    20aa:	50                   	push   %eax
-    20ab:	56                   	push   %esi
+    20a7:	8d 55 c4             	lea    0xffffffc4(%ebp),%edx
+    20aa:	52                   	push   %edx
+    20ab:	53                   	push   %ebx
     20ac:	e8 9f e2 ff ff       	call   350 <rank_for_schedule>
     20b1:	83 c4 10             	add    $0x10,%esp
     20b4:	85 c0                	test   %eax,%eax
     20b6:	78 0d                	js     20c5 <schedule_block+0x735>
-    20b8:	8b 04 bb             	mov    (%ebx,%edi,4),%eax
-    20bb:	83 ee 04             	sub    $0x4,%esi
-    20be:	89 44 bb 04          	mov    %eax,0x4(%ebx,%edi,4)
+    20b8:	8b 04 be             	mov    (%esi,%edi,4),%eax
+    20bb:	83 eb 04             	sub    $0x4,%ebx
+    20be:	89 44 be 04          	mov    %eax,0x4(%esi,%edi,4)
     20c2:	4f                   	dec    %edi
     20c3:	eb db                	jmp    20a0 <schedule_block+0x710>
     20c5:	8b 45 c4             	mov    0xffffffc4(%ebp),%eax
     20c8:	8b 4d e4             	mov    0xffffffe4(%ebp),%ecx
-    20cb:	89 44 bb 04          	mov    %eax,0x4(%ebx,%edi,4)
+    20cb:	89 44 be 04          	mov    %eax,0x4(%esi,%edi,4)
     20cf:	e9 a6 fa ff ff       	jmp    1b7a <schedule_block+0x1ea>
     20d4:	a1 00 00 00 00       	mov    0x0,%eax
 			20d5: R_386_32	sched_verbose

-- 
 Andreas Jaeger
  SuSE Labs aj@suse.de
   private aj@arthur.inka.de
    http://www.suse.de/~aj