https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85669
--- Comment #24 from Wilco <wdijkstr at arm dot com> --- (In reply to Douglas Mencken from comment #22) > (In reply to Wilco from comment #21) > > > That's odd. The stack pointer is definitely 16-byte aligned in all cases > > right? > > As I know, PowerPC has no special “stack pointer”, it is just one of general > purpose register, conventionally it is r1. Instruction like “stwu r3,-2(r1)” > which are common for prologues easily bin any alignment. STACK_BOUNDARY is the minimum stack alignment. The optimizer relies on this being correct. If the ABI or prologue doesn't guarantee the minimum alignment then alloca will fail, so it's essential to set STACK_BOUNDARY correctly. > > Can you check gcc.dg/pr78468.c passes and attach the disassembly > > please? > > Using which compiler? xgcc from stage1? Is it buildable alone by itself? Yes the stage1 compiler would be fine or alternatively use --disable-bootstrap to get an installed compiler.
