Hello, I have `GNU gdb 6.1-20040303 (Apple version gdb-413)' running on Mac OS X 10.4.2. I wrote some Altivec code and tried to load it into gdb. Although gdb can print the vector registers, they are not updated by any instructions that are run: all regs stay at the value 0x7FFFDEAD7FFFDEAD7FFFDEAD7FFFDEAD. I believe it's not a compilation issue, or a processor issue (mine is an MPC7447). Outside of gdb, the code seems to run fine (doesn't give an invalid instruction exception). This is my first foray into Altivec programming, so I'm wondering what I'm missing here? This can't be a bug as Google doesn't turn anything up. Décio