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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
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	[thread overview]
Message-ID: <bug-100217-4-OvASoPWMFK@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-100217-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100217

--- 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 = 1.0L;
  f0 += 127.L;
  f0 *= 32.L;
  return f0;
}
with -O0 -march=z14 -mlong-double-128 so that it is not all folded immediately
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.

  parent reply	other threads:[~2021-04-23 11:39 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-22 18:24 [Bug target/100217] New: " jakub at gcc dot gnu.org
2021-04-22 18:25 ` [Bug target/100217] " jakub at gcc dot gnu.org
2021-04-22 18:34 ` jakub at gcc dot gnu.org
2021-04-23  8:22 ` jakub at gcc dot gnu.org
2021-04-23 10:27 ` iii at linux dot ibm.com
2021-04-23 10:31 ` jakub at gcc dot gnu.org
2021-04-23 11:00 ` jakub at gcc dot gnu.org
2021-04-23 11:20 ` iii at linux dot ibm.com
2021-04-23 11:27 ` jakub at gcc dot gnu.org
2021-04-23 11:39 ` jakub at gcc dot gnu.org [this message]
2021-04-23 11:56 ` iii at linux dot ibm.com
2021-04-26 14:40 ` iii at linux dot ibm.com
2021-04-27 11:40 ` jakub at gcc dot gnu.org
2021-04-28 18:22 ` mark at gcc dot gnu.org
2021-04-28 19:14 ` jakub at gcc dot gnu.org
2021-04-29  9:58 ` mark at gcc dot gnu.org
2021-05-03 10:50 ` cvs-commit at gcc dot gnu.org
2021-05-06  1:26 ` cvs-commit at gcc dot gnu.org
2021-06-11 13:43 ` jakub at gcc dot gnu.org

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