Re: [PATCH] rs6000: Fix the condition with frame_pointer_needed_indeed [PR96072]

["Kewen.Lin" <linkw@linux.ibm.com>]

Hi Segher,

Thanks for the comments!

on 2022/9/23 06:13, Segher Boessenkool wrote:
> Hi!
> 
> On Thu, Sep 22, 2022 at 09:41:42AM +0800, Kewen.Lin wrote:
>> 	* config/rs6000/rs6000-logue.cc (rs6000_emit_epilogue): Update the
>> 	condition for adding REG_CFA_DEF_CFA reg note with
>> 	frame_pointer_needed_indeed.
> 
>> --- a/gcc/config/rs6000/rs6000-logue.cc
>> +++ b/gcc/config/rs6000/rs6000-logue.cc
>> @@ -4956,7 +4956,7 @@ rs6000_emit_epilogue (enum epilogue_type epilogue_type)
>>  	 a REG_CFA_DEF_CFA note, but that's OK;  A duplicate is
>>  	 discarded by dwarf2cfi.cc/dwarf2out.cc, and in any case would
>>  	 be harmless if emitted.  */
>> -      if (frame_pointer_needed)
>> +      if (frame_pointer_needed_indeed)
>>  	{
>>  	  insn = get_last_insn ();
> 
> I thought about adding an assert here, but the very next insn gives a
> clear enough message anyway, zo it would be just noise :-)
> 
>> diff --git a/gcc/testsuite/gcc.target/powerpc/pr96072.c b/gcc/testsuite/gcc.target/powerpc/pr96072.c
>> new file mode 100644
>> index 00000000000..23d1cc74ffd
>> --- /dev/null
>> +++ b/gcc/testsuite/gcc.target/powerpc/pr96072.c
>> @@ -0,0 +1,14 @@
>> +/* { dg-options "-O1" } */
>> +
>> +/* Verify there is no ICE on 32 bit environment.  */
> 
> /* This used to ICE with the SYSV ABI (PR96072).  */

Updated.

> 
> Please use -O2 if that works here.
> 

Updated too.

> Okay for trunk.  Thank you!
> 

Comitted in r13-2846, since it's a regression causing ICE, I think we want
this to backport?  Is it ok to backport this after burn-in time?

Thanks again!

BR,
Kewen