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
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 the
pr
