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Update aes_ccm_tag() hack for m68k. 

Even with ``memcmp fix'', GCC 9.4 miscompiles this function for -O[12].
But the situation was slightly changed from that with GCC 8.3:

* -O0 and -O1 work but -O2 fails for 68060 and 68040 (real hardware)
* -O0 and -O2 work but -O1 fails for 68020 and 68010 (TME)
This commit is contained in:
rin 2020-10-05 13:20:30 +00:00
parent 325b99962d
commit d1007566db
1 changed files with 8 additions and 9 deletions
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doc/HACKS
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@ -1,4 +1,4 @@
# $NetBSD: HACKS,v 1.210 2020/10/05 10:44:09 rin Exp $
# $NetBSD: HACKS,v 1.211 2020/10/05 13:20:30 rin Exp $
#
# This file is intended to document workarounds for currently unsolved
# (mostly) compiler bugs.
@ -985,15 +985,14 @@ descr GCC 8.4 miscompiles dwarf2expr.c with -O2 or -O1, which results in
kcah
port m68k
hack compile aes_ccm_tag() with -O0 for GCC8
hack compile aes_ccm_tag() with -O0 for GCC8 and GCC9
cdate Mon Aug 10 06:27:29 UTC 2020
mdate Mon Oct 5 22:00:00 JST 2020
who rin
file src/sys/crypto/aes/aes_ccm.c: 1.5
descr GCC 8.4 miscompiles aes_ccm_tag() for m68k with optimization level
-O[12], which results in failure in aes_ccm_selftest().
This is observed for amiga (A1200, 68060), mac68k (Quadra 840AV,
68040), and luna68k (nono, 68030 emulator). However, it is not for
sun3 (TME, 68020 emulator) and sun2 (TME, 68010 emulator).
At the moment, it is unclear whether this is due to differences b/w
68010-20 vs 68030-60, or something wrong with TME.
descr GCC 9.4 and 8.3 miscompile aes_ccm_tag() for m68k with optimization
level -O[12], which results in failure in aes_ccm_selftest().
For 9.4, -O0 and -O1 work but -O2 fails for amiga (A1200, 68060) and
mac68k (Quadra 840AV, 68040). Whereas -O0 and -O2 work but -O1 fails
for sun3 (TME, 68020 emulator) and sun2 (TME, 68010 emulator).
kcah