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Date: Sat, 13 Apr 1996 07:37:24 -0700 (PDT)
From: John Hay <jhay>
Message-Id: <199604131437.HAA26141@freefall.freebsd.org>
To: CVS-committers, cvs-all, cvs-sys
Subject: cvs commit:  src/sys/netipx ipx_usrreq.c
Sender: owner-cvs-sys@FreeBSD.ORG
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jhay        96/04/13 07:37:23

  Modified:    sys/netipx  ipx_usrreq.c
  Log:
  Don't use a newfangled auto initializer.  Initialize everything by
  assignment to avoid one bug and several pessimizations.
  
  In the old version, gcc-2.6.3 (i386 version) generates 16 bytes
  of static data and copies it using 4 4-byte load-stores.  gcc-2.7.2
  generates 2 1-byte stores and calls memset() to zero 14 bytes.
  Linking fails because memset() doesn't exist in the kernel.
  
  In both versions, the 2 bytes stored directly are all that is
  actually used unless the null padding at the end is used, since
  the 3 4-byte words in the middle are initialized again by struct
  assignment.  These words are misaligned.  gcc generates misaligned
  load-stores for (small) misaligned struct copies.
  
  Submitted by:	Bruce Evans
  
  Revision  Changes    Path
  1.6       +6 -2      src/sys/netipx/ipx_usrreq.c