[RS6000] PR96493, powerpc local call linkage failure

Peter Bergner bergner@linux.ibm.com
Tue Aug 11 17:36:28 GMT 2020

On 8/11/20 11:35 AM, Segher Boessenkool wrote:
> Hi Alan,
> On Tue, Aug 11, 2020 at 06:38:53PM +0930, Alan Modra wrote:
>> This fixes a fail when power10 isn't supported by binutils, and
>> ensures the test isn't run without power10 hardware or simulation on
>> the off chance that power10 insns are emitted in the future for this
>> testcase.
> The testcases said it wanted power8, so why did it fail?  GCC shouldn't
> use anything that requires p10 support in binutils then, or what do I
> miss here?

It failed with an assembler error because one of the functions in the
test uses an attribute target power10 and GCC emits a ".machine power10"
assembler directive in case we do generate a power10 instruction(s).
The old binutils Bill used doesn't know about power10, so boom.
That is what requires the dg-require-effective-target power10_ok.

Now given the power10 function is so small (just a call to a p8
function), the chance we'll generate a p10 instruction is low (zero?),
so we could just keep the dg-do run as is (ie, always run), but
might that change one day?


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