The attached code (IsWeirdness.{cc,i}) produces the correct result when compiled with -O2 -finline-functions on ia64 and with -O3 on alpha, but produces the incorrect result with -O3 on ia64, which leads me to the conclusion that something's gone all funny with -frename-registers on ia64. The code is a bit nonsensical, as I've reduced it as much as possible while preserving the incorrect behavior, but it should print the number "-764". With -O3 on ia64, it prints "-528".
Created attachment 6028 [details] IsWeirdness.cc
Created attachment 6029 [details] IsWeirdness.ii (gzipped)
What bintuils are you using, as this could also be a bug in gas?
Subject: Re: -frename-registers produces incorrect code on ia64 as -v returns: GNU assembler version 2.14.90.0.7 (ia64-linux) using BFD version 2.14.90.0.7 20031029 Debian GNU/Linux pinskia at gcc dot gnu dot org wrote: > ------- Additional Comments From pinskia at gcc dot gnu dot org 2004-04-06 00:39 ------- > What bintuils are you using, as this could also be a bug in gas? >
Actually there was a fix to the mainline and I think the 3.4.0 branch where the problem with -frename- registers and IA64 was a target problem rather than a generic code problem.
I have run this testcase with the 3.3.* and 3.4.* and ToT (pre-4.0) compilers on IA64 linux. The bug exists in all 3.3.* compilers (3.3.[012345]) and none of the 3.4 compilers (3.4.[0123]). Nor does it happen on ToT. Are we still doing 3.3 patches? If I knew what change between 3.3 and 3.4 fixed this I could look into backporting it but I don't know what change fixed it and I don't know if it is worth trying to find out.
Fixed in 3.4.0, 3.3.x is just on regression fixing mode and since this is most likely not a regression I am closing as fixed.