On Mar 11, 2021, Iain Sandoe <idsan...@googlemail.com> wrote:
> Alexandre Oliva <ol...@adacore.com> wrote:
>> On Mar 10, 2021, Alexandre Oliva <ol...@adacore.com> wrote:
>>
>>> * gcc.target/powerpc/prefix-ds-dq.c: Enable __float128.
>>
>> I've been reminded that this is not enough for the scan-assembler tests
>> to pass, at least in our configurations. Nearly all of the asm
>> expectations are unmet. I'm yet to identify the root cause.
> I have the following patch that I was intending to apply/post later (since
> the test makes unconditional use of __float128 which is not available on
> all platforms).
> does this solve your issue?
I suppose it would silence the fail by skipping the test. I also
*think* it would defeat the purpose of the test, since the requirement
test would take effect before -mcpu=power10.
My understanding is that this test, being of the "check output asm"
kind, rather than "check that it compiles" or "check that it runs
without crashing", we'd get better (or at least no-worse) coverage out
of any single test run by attempting to perform the test regardless of
the powerpc target in use.
E.g., I found that, besides -mfloat128, I'd get the expect asm by just
cancelling out the -mstrict-align flag that the toolchain I'm testing
enables by default. So here's my updated patch, that I'm nearly done
retesting. Ok to install?
add -mfloat128 to __float128-using test missing it
Most (all?) powerpc tests that use the __float128 type either enable
it with -mfloat128, or use effective target requirements to check for
its presence.
prefix-ds-dq.c is failing in some of our configurations because it
uses the __float128 type without checking for it, or enabling it
explicitly.
Since it's a compile test, I'm enabling it explicitly.
The flag causes a warning to be printed when float128 may not be
entirely supported; I've arranged for the warning to be ignored in
this test.
In order for the expected asm to be generated, I found the need for
-mno-strict-align, on toolchains that enable -mstrict-align by
default.
for gcc/testsuite/ChangeLog
* gcc.target/powerpc/prefix-ds-dq.c: Enable __float128,
disable -mstrict-align.
---
gcc/testsuite/gcc.target/powerpc/prefix-ds-dq.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/gcc/testsuite/gcc.target/powerpc/prefix-ds-dq.c
b/gcc/testsuite/gcc.target/powerpc/prefix-ds-dq.c
index 554cd0c1beac0..ddf563521889c 100644
--- a/gcc/testsuite/gcc.target/powerpc/prefix-ds-dq.c
+++ b/gcc/testsuite/gcc.target/powerpc/prefix-ds-dq.c
@@ -1,7 +1,8 @@
/* { dg-do compile } */
/* { dg-require-effective-target powerpc_prefixed_addr } */
/* { dg-require-effective-target lp64 } */
-/* { dg-options "-O2 -mdejagnu-cpu=power10" } */
+/* { dg-options "-O2 -mdejagnu-cpu=power10 -mfloat128 -mno-strict-align" } */
+/* { dg-prune-output ".-mfloat128. option may not be fully supported" } */
/* Tests whether we generate a prefixed load/store operation for addresses that
don't meet DS/DQ offset constraints. 64-bit is needed for testing the use
--
Alexandre Oliva, happy hacker https://FSFLA.org/blogs/lxo/
Free Software Activist GNU Toolchain Engineer
Vim, Vi, Voltei pro Emacs -- GNUlius Caesar
