Re: [PATCH, rs6000] xfail float128 comparison test case that fails on powerpc64 [PR108728]

[HAO CHEN GUI <guihaoc@linux.ibm.com>]

Hi Kewen,

在 2023/4/13 16:32, Kewen.Lin 写道:
> xfail all powerpc*-*-* can have some XPASSes on those ENVs with
> software emulation.  Since the related hw insn xscmpuqp is guarded
> with TARGET_FLOAT128_HW, could we use the effective target
> ppc_float128_hw instead?

Thanks for your review comments. It's tricky. It invokes "__lekf2"
with "-mno-float128_hw". But it doesn't always pass the check.
With math library on P8, it can. With the library on P9, it fails.
So it's totally depended on the version of library which is not
controlled by GCC. What's your opinion?

Test result on P9
make check-gcc-c RUNTESTFLAGS="--target_board=unix'{-mno-float128-hardware}' dg-torture.exp=float128-cmp-invalid.c"

FAIL: gcc.dg/torture/float128-cmp-invalid.c   -O0  execution test
FAIL: gcc.dg/torture/float128-cmp-invalid.c   -O1  execution test
FAIL: gcc.dg/torture/float128-cmp-invalid.c   -O2  execution test
FAIL: gcc.dg/torture/float128-cmp-invalid.c   -O3 -g  execution test
FAIL: gcc.dg/torture/float128-cmp-invalid.c   -Os  execution test
FAIL: gcc.dg/torture/float128-cmp-invalid.c   -O2 -flto -fno-use-linker-plugin -flto-partition=none  execution test
FAIL: gcc.dg/torture/float128-cmp-invalid.c   -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects  execution test

                === gcc Summary ===

# of expected passes            7
# of unexpected failures        7

Gui Haochen
Thanks