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tests/lib/libm/t_fe_round.c: Work around likely ia64 bug in gcc.

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riastradh 2024-05-05 23:08:53 +00:00
parent 3822903a53
commit 2b70237da2
2 changed files with 25 additions and 1 deletions
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13
doc/HACKS
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@ -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

13
tests/lib/libm/t_fe_round.c
View File

@ -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