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[src/trunk]: src/sys/arch/powerpc/fpu Fix fsel; frB is chosen when frA is neg...
details: https://anonhg.NetBSD.org/src/rev/ad08d001eb1e
branches: trunk
changeset: 369749:ad08d001eb1e
user: rin <rin%NetBSD.org@localhost>
date: Tue Aug 30 10:59:43 2022 +0000
description:
Fix fsel; frB is chosen when frA is negative or NaN.
For fpu_emu.c rev 1.41 or prior, wrong register was chosen for
NaN with sign bit being cleared.
diffstat:
sys/arch/powerpc/fpu/fpu_emu.c | 12 ++++++++----
1 files changed, 8 insertions(+), 4 deletions(-)
diffs (34 lines):
diff -r 3be904053af4 -r ad08d001eb1e sys/arch/powerpc/fpu/fpu_emu.c
--- a/sys/arch/powerpc/fpu/fpu_emu.c Tue Aug 30 10:55:06 2022 +0000
+++ b/sys/arch/powerpc/fpu/fpu_emu.c Tue Aug 30 10:59:43 2022 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: fpu_emu.c,v 1.41 2022/08/30 10:55:06 rin Exp $ */
+/* $NetBSD: fpu_emu.c,v 1.42 2022/08/30 10:59:43 rin Exp $ */
/*
* Copyright 2001 Wasabi Systems, Inc.
@@ -76,7 +76,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: fpu_emu.c,v 1.41 2022/08/30 10:55:06 rin Exp $");
+__KERNEL_RCSID(0, "$NetBSD: fpu_emu.c,v 1.42 2022/08/30 10:59:43 rin Exp $");
#ifdef _KERNEL_OPT
#include "opt_ddb.h"
@@ -670,9 +670,13 @@
FPU_EMU_EVCNT_INCR(fsel);
DPRINTF(FPE_INSN, ("fpu_execute: FSEL\n"));
a = (int *)&fe->fe_fpstate->fpreg[ra];
- if ((*a & 0x80000000) && (*a & 0x7fffffff))
- /* fra < 0 */
+ if ((( a[0] & 0x80000000) &&
+ ((a[0] & 0x7fffffff) | a[1])) ||
+ (( a[0] & 0x7ff00000) &&
+ ((a[0] & 0x000fffff) | a[1]))) {
+ /* negative/NaN or NaN */
rc = rb;
+ }
DPRINTF(FPE_INSN, ("f%d => f%d\n", rc, rt));
memcpy(&fs->fpreg[rt], &fs->fpreg[rc],
sizeof(double));
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