XPost: linux.debian.ports.superh

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Source: gcc-15
Version: 15.1.0-8
Severity: normal
Tags: patch
User: [email protected]
Usertags: sh4
X-Debbugs-Cc: [email protected]

Hi,

gcc upstream recently merged a patch which fixes a lot of math testsuite failures
in glibc [1][2][3]. The patch has not been backported to the gcc-15 branch yet, so
it would be nice if we could merge the patch in the gcc-15 Debian package in the
mean time.

I'm attaching it in any case. I have cherry-picked this patch while on the gcc-15
branch of the gcc git repository using "git cherry-pick".

Thanks,
Adrian

[1] https://sourceware.org/bugzilla/show_bug.cgi?id=30973
[2] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111814
[3] https://gcc.gnu.org/cgit/gcc/commit/?id=2a643f55f5acc05dcc7cee133647bf3193d5b563

--
.''`. John Paul Adrian Glaubitz
: :' : Debian Developer
`. `' Physicist
`- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913

From f1496a2ebee717137ba0b3c96aa4cbf8c96f51ec Mon Sep 17 00:00:00 2001
From: Jiaxun Yang <[email protected]>
Date: Sat, 19 Apr 2025 08:07:58 -0600
Subject: [PATCH] [PATCH v2] sh: Correct NaN signalling bit and propagation
rules [PR111814]

As per architecture, SuperH has a reversed NaN signalling bit
vs IEEE754-2008, it also has a NaN propgation rule similar to
MIPS style.

Use mips style float format and mode for all float types, and
correct sfp-machine header accordingly.

PR target/111814

gcc/ChangeLog:

* config/sh/sh-modes.def (RESET_FLOAT_FORMAT): Use mips format.
(FLOAT_MODE): Use mips mode.

libgcc/ChangeLog:

* config/sh/sfp-machine.h (_FP_NANFRAC_B): Reverse signaling bit.
(_FP_NANFRAC_H): Likewise.
(_FP_NANFRAC_S): Likewise.
(_FP_NANFRAC_D): Likewise.
(_FP_NANFRAC_Q): Likewise.
(_FP_KEEPNANFRACP): Enable for target.
(_FP_QNANNEGATEDP): Enable for target.
(_FP_CHOOSENAN): Port from MIPS.

gcc/testsuite/ChangeLog:

* gcc.target/sh/pr111814.c: New test.
---
gcc/config/sh/sh-modes.def | 6 +++++
gcc/testsuite/gcc.target/sh/pr111814.c | 7 +++++
libgcc/config/sh/sfp-machine.h | 36 ++++++++++++++++----------
3 files changed, 36 insertions(+), 13 deletions(-)
create mode 100644 gcc/testsuite/gcc.target/sh/pr111814.c

diff --git a/src/gcc/config/sh/sh-modes.def b/src/gcc/config/sh/sh-modes.def index 80650b429e4..e31ae694a48 100644
--- a/src/gcc/config/sh/sh-modes.def
+++ b/src/gcc/config/sh/sh-modes.def
@@ -17,6 +17,12 @@ You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */

+/* SH has the same reversed quiet bit as MIPS. */
+RESET_FLOAT_FORMAT (SF, mips_single_format);
+RESET_FLOAT_FORMAT (DF, mips_double_format);
+/* TFmode: IEEE quad floating point (software). */
+FLOAT_MODE (TF, 16, mips_quad_format);
+
/* Vector modes. */
VECTOR_MODE (INT, QI, 2); /* V2QI */
VECTOR_MODES (INT, 4);