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Re: patch to alias.c checked in
- To: Franz Sirl <Franz dot Sirl-kernel at lauterbach dot com>
- Subject: Re: patch to alias.c checked in
- From: Bernd Schmidt <bernds at cambridge dot redhat dot com>
- Date: Thu, 8 Mar 2001 11:07:52 +0000 (GMT)
- Cc: <gcc-patches at gcc dot gnu dot org>
On Tue, 6 Mar 2001, Franz Sirl wrote:
>
> good compiler:
> 3353 r1289=r114<<2
> 3355 r1290=r1289+0x4 (==(r114<<2)+0x4)
> 3383 r114=r114+1
> 3388 r1302=r114<<2 (this means that r1302 is equal to r1290 now)
> 3390 r1303=r1302+0x4 (==(r114<<2)+0x4)
> 3371 r1298=[r1666+r1289]
> 3377 [r1666+r1290]=r1300
> 3396 r1306=[r1666+r1302]
> 3397 [r1666+r1303]=r1306
>
> bad compiler:
> 3353 r1289=r114<<2
> 3355 r1290=r1289+0x4 (==(r114<<2)+0x4)
> 3383 r114=r114+1
> 3388 r1302=r114<<2 (this means that r1302 is equal to r1290 now)
> 3390 r1303=r1302+0x4 (==(r114<<2)+0x4)
> 3371 r1298=[r1666+r1289]
> 3396 r1306=[r1666+r1302]
> 3377 [r1666+r1290]=r1300
> 3397 [r1666+r1303]=r1306
I need full rtl dumps to debug this. Also, if you have any idea which of the
involved registers is affected by the patch, it would help to know that.
Bernd