Quoting Paolo Bonzini :
Unless I'm missing something, this is going all the way down to the end
of the function, bypassing the CFG, so it is neither efficient nor
correct.
new_insn hasn't been emitted yet, hence it is a single insn or a short
chain of insn to implement a no-op move (for a post
> Unless I'm missing something, this is going all the way down to the end
> of the function, bypassing the CFG, so it is neither efficient nor correct.
No, gen_ functions doesn't emit the instructions.
> For DSE you should set up backwards liveness simulation, and use that
> instead of note_store
On 11/03/2011 08:01 PM, Eric Botcazou wrote:
+ info.insert_before = insn;
+ info.first = new_insn;
+ info.fixed_regs_live = insn_info->fixed_regs_live;
+ info.failure = false;
+ for (cur = new_insn; cur; cur = NEXT_INSN (cur))
+{
+ info.current = cur;
+ note_stores (PATTERN (cu
> This patch makes emit_inc_dec_insn_before use add3_insn / gen_move_insn
> so that the appropriate expanders are used to create the new instructions,
> and for dse it use the available register liveness information to check
> that no live fixed hard register, like a flags register, is clobbered in
