Module Name: src
Committed By: riastradh
Date: Sun May 5 23:08:53 UTC 2024
Modified Files:
src/doc: HACKS
src/tests/lib/libm: t_fe_round.c
Log Message:
tests/lib/libm/t_fe_round.c: Work around likely ia64 bug in gcc.
To generate a diff of this commit:
cvs rdiff -u -r1.242 -r1.243 src/doc/HACKS
cvs rdiff -u -r1.16 -r1.17 src/tests/lib/libm/t_fe_round.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/doc/HACKS
diff -u src/doc/HACKS:1.242 src/doc/HACKS:1.243
--- src/doc/HACKS:1.242 Thu Apr 4 23:53:05 2024
+++ src/doc/HACKS Sun May 5 23:08:53 2024
@@ -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
Index: src/tests/lib/libm/t_fe_round.c
diff -u src/tests/lib/libm/t_fe_round.c:1.16 src/tests/lib/libm/t_fe_round.c:1.17
--- src/tests/lib/libm/t_fe_round.c:1.16 Fri May 3 21:40:51 2024
+++ src/tests/lib/libm/t_fe_round.c Sun May 5 23:08:53 2024
@@ -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
