From 2b70237da2204245f558b9cf27129632cfe1aeec Mon Sep 17 00:00:00 2001
From: riastradh <riastradh@NetBSD.org>
Date: Sun, 5 May 2024 23:08:53 +0000
Subject: [PATCH] tests/lib/libm/t_fe_round.c: Work around likely ia64 bug in
 gcc.

---
 doc/HACKS                   | 13 ++++++++++++-
 tests/lib/libm/t_fe_round.c | 13 +++++++++++++
 2 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/doc/HACKS b/doc/HACKS
index 6351a6f8a3a6..d329fcaadc34 100644
--- a/doc/HACKS
+++ b/doc/HACKS
@@ -1,4 +1,4 @@
-# $NetBSD: HACKS,v 1.242 2024/04/04 23:53:05 christos Exp $
+# $NetBSD: HACKS,v 1.243 2024/05/05 23:08:53 riastradh Exp $
 #
 # This file is intended to document workarounds for currently unsolved
 # (mostly) compiler bugs.
@@ -1124,3 +1124,14 @@ descr
 	Some files create dwarf info that our ctfmerge can't handle.
 	We downgrade dwarf generation to version 3 which works.
 kcah
+
+hack	ia64: work around feclearexcept/fetestexcept compiler bug
+cdate	Sun May  5 23:06:10 UTC 2024
+who	riastradh
+file	tests/lib/libm/t_fe_round.c
+descr
+	Without judiciously placed __insn_barrier, we get:
+	/tmp//ccJayu9g.s:2793: Warning: Use of 'mov.m' violates RAW dependency 'AR[FPSR].sf0.flags' (impliedf)
+	/tmp//ccJayu9g.s:2793: Warning: Only the first path encountering the conflict is reported
+	/tmp//ccJayu9g.s:2757: Warning: This is the location of the conflicting usage
+kcah
diff --git a/tests/lib/libm/t_fe_round.c b/tests/lib/libm/t_fe_round.c
index 4fd4f8d84ccd..08633189fedf 100644
--- a/tests/lib/libm/t_fe_round.c
+++ b/tests/lib/libm/t_fe_round.c
@@ -195,6 +195,19 @@ ATF_TC_BODY(fe_nearbyint_rint, tc)
 			 */
 			fesetround(values[i].round_mode);
 
+#ifdef __ia64__
+/*
+ * Without this barrier, we get:
+ *
+ * /tmp//ccJayu9g.s:2793: Warning: Use of 'mov.m' violates RAW dependency 'AR[FPSR].sf0.flags' (impliedf)
+ * /tmp//ccJayu9g.s:2793: Warning: Only the first path encountering the conflict is reported
+ * /tmp//ccJayu9g.s:2757: Warning: This is the location of the conflicting usage
+ *
+ * (If you fix this, remove the entry from doc/HACKS.)
+ */
+			__insn_barrier();
+#endif
+
 			/*
 			 * Clear sticky floating-point exception bits
 			 * so we can verify whether the FE_INEXACT