-fuse-caller-save - Collect register usage information

[Tom de Vries]

On 19-06-14 07:13, Richard Henderson wrote:
> On 05/19/2014 07:30 AM, Tom de Vries wrote:
>> >+  for (insn = get_insns (); insn != NULL_RTX; insn = next_insn (insn))
>> >+    {
>> >+      HARD_REG_SET insn_used_regs;
>> >+
>> >+      if (!NONDEBUG_INSN_P (insn))
>> >+	continue;
>> >+
>> >+      find_all_hard_reg_sets (insn, &insn_used_regs, false);
>> >+
>> >+      if (CALL_P (insn)
>> >+	  && !get_call_reg_set_usage (insn, &insn_used_regs, call_used_reg_set))
>> >+	{
>> >+	  CLEAR_HARD_REG_SET (node->function_used_regs);
>> >+	  return;
>> >+	}
>> >+
>> >+      IOR_HARD_REG_SET (node->function_used_regs, insn_used_regs);
>> >+    }
> As an aside, wouldn't it work out better if we collect into a local variable
> instead of writing to memory here in node->function_used_regs each time?

Richard,

Agreed. This patch implements that. I'll bootstrap and reg-test on x86_64 and 
commit as obvious.

Thanks,
- Tom


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