On 10/04/2011 03:10 PM, Bernd Schmidt wrote: > * doc/invoke.texi (-fshrink-wrap): Document. > * opts.c (default_options_table): Add it. > * common.opt (fshrink-wrap): Add. > * function.c (emit_return_into_block): Remove useless declaration. > (record_hard_reg_uses_1, record_hard_reg_uses, frame_required_for_rtx, > requires_stack_frame_p, gen_return_pattern): New static functions. > (emit_return_into_block): New arg simple_p. All callers changed. > Use gen_return_pattern. > (thread_prologue_and_epilogue_insns): Implement shrink-wrapping. > * config/i386/i386.md (return): Expand into a simple_return. > (simple_return): New expander): > (simple_return_internal, simple_return_internal_long, > simple_return_pop_internal_long, simple_return_indirect_internal): > Renamed from return_internal, return_internal_long, > return_pop_internal_long and return_indirect_internal; changed to use > simple_return. > * config/i386/i386.c (ix86_expand_epilogue): Adjust to expand > simple returns. > (ix86_pad_returns): Likewise. > * function.h (struct rtl_data): Add member shrink_wrapped. > * cfgcleanup.c (outgoing_edges_match): If shrink-wrapped, edges that > are not jumps or sibcalls can't be compared. > > * gcc.target/i386/sw-1.c: New test.
Ok. As a followup, I think this option needs to be disabled for profiling and profile_after_prologue. Should be a mere matter of frobbing the options at startup. r~
