On Thu, Sep 13, 2001 at 04:15:10PM +0200, Kjeld Borch Egevang wrote: > Hi all. > > I discovered an optimization error in the current gcc for MIPS. > > When I compile the code below with -O2 it clears the code-field just > after setting it. The instructions are mixed up. It works fine with -O1 > and -O0. > > If the "//" is removed in front of the first printf, it works too. > The code isn't ISO C. You cannot declare something as short and then access it as int. On x86: # gcc alias.c -O put_code after, code=5 5 gen_rtx, code=5 # gcc alias.c -O2 put_code after, code=5 0 gen_rtx, code=0 On mips, # gcc alias.c -O put_code after, code=5 5 gen_rtx, code=5 # gcc alias.c -O2 put_code after, code=5 5 gen_rtx, code=0 You can fix the code or add -fno-strict-aliasing # gcc alias.c -O2 -fno-strict-aliasing put_code after, code=5 5 gen_rtx, code=5 H.J.
