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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/100217] [11/12 Regression] ICE when building valgrind
 testsuite with -march=z14 since r11-7552
Date: Fri, 23 Apr 2021 11:39:49 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100217

--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
That said, I'm afraid I don't really understand what wrong happens with the
patch I've attached.
Trying something like:
long double
foo (void)
{
  register long double f0 asm ("f0");
  f0 =3D 1.0L;
  f0 +=3D 127.L;
  f0 *=3D 32.L;
  return f0;
}
with -O0 -march=3Dz14 -mlong-double-128 so that it is not all folded immedi=
ately
shows in the end the computations are done in vector registers.
And another thing to try is intermix that with inline asm expecting those in
"+f" so that intermediate results are pushed to the floating point register
pair.=