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SubjectRe: -mregparm=3
On Wed, 8 Jul 1998, Benjamin C.R. LaHaise wrote:

>fix. Fwiw, I extracted a portion of the NE2000 driver that demonstrates
>the bug (that's where my -mregparm'd kernel would Oops during booting).

I recompiled the kernel with my hacked gcc-2.8.1 (not the right(TM)

--- /tmp/gcc-2.8.1/toplev.c Thu Feb 26 03:04:46 1998
+++ gcc-2.8.1/toplev.c Thu Jul 9 17:13:10 1998
@@ -3393,8 +3393,10 @@

/* If -opt, try combining insns through substitution. */

+ optimize = 0;
if (optimize > 0)
TIMEVAR (combine_time, combine_instructions (insns, max_reg_num ()));
+ optimize = 1;

/* Dump rtl code after insn combination. */

--- /tmp/gcc-2.8.1/loop.c Fri Feb 6 20:23:34 1998
+++ gcc-2.8.1/loop.c Thu Jul 9 17:08:55 1998
@@ -3037,6 +3037,7 @@
register int count = 0;
register rtx dest;

+ return;
bzero ((char *) last_set, nregs * sizeof (rtx));
for (insn = from; insn != to; insn = NEXT_INSN (insn))
{
patch though...) that seems to fix your piece of code and now the kernel
doesn' t crash anymore if compiled with -mregparm=1 (=3 don' t compile at
all). Before my gcc patch I got a reboot after bread. The kernel now
instead boot fine but stops before to exec init but everything seems to
works (sysrq keys for example). I' ll take a look at your kernel patch
against 21 soon.

Andrea[s] Arcangeli


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