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Re: gcc/gcc ChangeLog tree-ssa-loop-im.c


Zdenek Dvorak wrote:
>>
>>This patch causes a bootstrap failure on powerpc-darwin.
>>The problem is that we get the following differences for emit-rtl.c
>>between stage1 and stage2, this usually means that the hastable is
>>traversed but the hastable is not stable across the compiling:
> 
> 
> I cannot reproduce the problem (using powerpc-linux and
> powerpc64-linux).

I get a very similar boostrap comparison failure consistently
with current mainline on i686-pc-linux-gnu.

For emit-rtl.c, for example, the differences are:
---------------------------- 8< ----------------------------
 Disassembly of section .text:
@@ -7828,6 +7828,6 @@
     5c59:      89 54 24 34             mov    %edx,0x34(%esp,1)
     5c5d:      74 4b                   je     5caa <init_emit_once+0x16a>
-    5c5f:      31 c9                   xor    %ecx,%ecx
-    5c61:      31 db                   xor    %ebx,%ebx
+    5c5f:      31 db                   xor    %ebx,%ebx
+    5c61:      31 c9                   xor    %ecx,%ecx
     5c63:      eb 18                   jmp    5c7d <init_emit_once+0x13d>
     5c65:      66 83 f8 20             cmp    $0x20,%ax
@@ -7847,6 +7847,6 @@
     5c9a:      84 c0                   test   %al,%al
     5c9c:      75 dc                   jne    5c7a <init_emit_once+0x13a>
-    5c9e:      89 0d 00 00 00 00       mov    %ecx,0x0
-    5ca4:      89 1d 00 00 00 00       mov    %ebx,0x0
+    5c9e:      89 1d 00 00 00 00       mov    %ebx,0x0
+    5ca4:      89 0d 00 00 00 00       mov    %ecx,0x0
     5caa:      0f b6 05 04 00 00 00    movzbl 0x4,%eax
     5cb1:      31 db                   xor    %ebx,%ebx
---------------------------- 8< ----------------------------

Let me know how I can help you in resolving this issue.

Thanks,
Ranjit.

-- 
Ranjit Mathew      Email: rmathew AT gmail DOT com

Bangalore, INDIA.    Web: http://ranjitmathew.hostingzero.com/


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