Re: PATCH [2/n]: Prepare x32: Convert pointer to TLS symbol if needed

["H.J. Lu" <hjl.tools@gmail.com>]

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On Wed, Jun 29, 2011 at 7:06 AM, H.J. Lu <hjl.tools@gmail.com> wrote:
> On Wed, Jun 29, 2011 at 1:45 AM, Richard Sandiford
> <richard.sandiford@linaro.org> wrote:
>> "H.J. Lu" <hongjiu.lu@intel.com> writes:
>>> @@ -706,7 +706,13 @@ precompute_register_parameters (int num_actuals, struct arg_data *args,
>>>          pseudo now.  TLS symbols sometimes need a call to resolve.  */
>>>       if (CONSTANT_P (args[i].value)
>>>           && !targetm.legitimate_constant_p (args[i].mode, args[i].value))
>>> -       args[i].value = force_reg (args[i].mode, args[i].value);
>>> +       {
>>> +         if (GET_MODE (args[i].value) != args[i].mode)
>>> +           args[i].value = convert_to_mode (args[i].mode,
>>> +                                            args[i].value,
>>> +                                            args[i].unsignedp);
>>> +         args[i].value = force_reg (args[i].mode, args[i].value);
>>> +       }
>>
>> But if GET_MODE (args[i].value) != args[i].mode, then the call to
>> targetm.legitimate_constant_p looks wrong.  The mode passed in the
>> first argument is supposed to the mode of the second argument.
>>
>> Is there any reason why this and the following:
>>
>>        /* If we are to promote the function arg to a wider mode,
>>           do it now.  */
>>
>>        if (args[i].mode != TYPE_MODE (TREE_TYPE (args[i].tree_value)))
>>          args[i].value
>>            = convert_modes (args[i].mode,
>>                             TYPE_MODE (TREE_TYPE (args[i].tree_value)),
>>                             args[i].value, args[i].unsignedp);
>>
>> need to be done in the current order?  I can't think of any off-hand.
>> If not, would swapping them also fix the bug?
>>
>> (I can't review this either way, of course.)
>
> It works on the testcase.  I will do a full test.
>

It works.  There are no regressions on Linux/x86-64.
OK for trunk?

Thanks.

-- 
H.J.
----

2011-06-29  H.J. Lu  <hongjiu.lu@intel.com>

	PR middle-end/47715
	* calls.c (precompute_register_parameters): Promote the function
	argument before checking non-legitimate constant.

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2011-06-29  H.J. Lu  <hongjiu.lu@intel.com>

	PR middle-end/47715
	* calls.c (precompute_register_parameters): Promote the function
	argument before checking non-legitimate constant.

diff --git a/gcc/calls.c b/gcc/calls.c
index bba477c..7538e4e 100644
--- a/gcc/calls.c
+++ b/gcc/calls.c
@@ -702,12 +702,6 @@ precompute_register_parameters (int num_actuals, struct arg_data *args,
 	    pop_temp_slots ();
 	  }
 
-	/* If the value is a non-legitimate constant, force it into a
-	   pseudo now.  TLS symbols sometimes need a call to resolve.  */
-	if (CONSTANT_P (args[i].value)
-	    && !targetm.legitimate_constant_p (args[i].mode, args[i].value))
-	  args[i].value = force_reg (args[i].mode, args[i].value);
-
 	/* If we are to promote the function arg to a wider mode,
 	   do it now.  */
 
@@ -717,6 +711,12 @@ precompute_register_parameters (int num_actuals, struct arg_data *args,
 			     TYPE_MODE (TREE_TYPE (args[i].tree_value)),
 			     args[i].value, args[i].unsignedp);
 
+	/* If the value is a non-legitimate constant, force it into a
+	   pseudo now.  TLS symbols sometimes need a call to resolve.  */
+	if (CONSTANT_P (args[i].value)
+	    && !targetm.legitimate_constant_p (args[i].mode, args[i].value))
+	  args[i].value = force_reg (args[i].mode, args[i].value);
+
 	/* If we're going to have to load the value by parts, pull the
 	   parts into pseudos.  The part extraction process can involve
 	   non-trivial computation.  */