Re: [PATCH,rs6000] Fix vsx-regs.exp testcase failure

[Ulrich Weigand <uweigand@de.ibm.com>]

On Thu, Apr 01, 2021 at 03:39:26PM -0500, will schmidt wrote:
> 
> Hi,
>   This test (gdb.arch/vsx-regs.exp) exercises updates to the
> F0-F31 and VS0-VS31 registers and verifies updates to the same.
> Note that the registers overlap; the doubleword[1] portion of
> any VS0-VS31 register contains the F0-F31 register contents, so
> any updates to one can be measured in the other.
> 
> Per a brief investigation, we see that dl_main() currently
> uses some VSX instructions, so the VS* values are not
> going to be zero when this testcase reaches main, where these
> tests begin.  The test harness does not explicitly
> initialize the full VS* values, so the first test loop
> that updates the F* values means our VS* values are
> partially uninitalized and will fail the first set of checks.
> This update explicitly initializes the doubleword[0] portion
> of the VS* registers, to allow this test to succeed.
> 
> YYYY-MM-DD  Will Schmidt  <will_schmidt@vnet.ibm.com>
> 
> gdb/testsuite/ChangeLog:
> 	* gdb.arch/vsx-regs.exp: Initilize vs* doublewords.

Typo "Initialize".  Otherwise this is OK.

Thanks,
Ulrich

-- 
  Dr. Ulrich Weigand
  GNU/Linux compilers and toolchain
  Ulrich.Weigand@de.ibm.com