aboutsummaryrefslogtreecommitdiff
path: root/arch/arm/nwfpe/fpa11_cpdo.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/arm/nwfpe/fpa11_cpdo.c
downloadlinux-stericsson-2.6.12-rc2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/arm/nwfpe/fpa11_cpdo.c')
-rw-r--r--arch/arm/nwfpe/fpa11_cpdo.c132
1 files changed, 132 insertions, 0 deletions
diff --git a/arch/arm/nwfpe/fpa11_cpdo.c b/arch/arm/nwfpe/fpa11_cpdo.c
new file mode 100644
index 000000000000..1bea67437b6f
--- /dev/null
+++ b/arch/arm/nwfpe/fpa11_cpdo.c
@@ -0,0 +1,132 @@
+/*
+ NetWinder Floating Point Emulator
+ (c) Rebel.COM, 1998,1999
+ (c) Philip Blundell, 2001
+
+ Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include <linux/config.h>
+#include "fpa11.h"
+#include "fpopcode.h"
+
+unsigned int SingleCPDO(const unsigned int opcode, FPREG * rFd);
+unsigned int DoubleCPDO(const unsigned int opcode, FPREG * rFd);
+unsigned int ExtendedCPDO(const unsigned int opcode, FPREG * rFd);
+
+unsigned int EmulateCPDO(const unsigned int opcode)
+{
+ FPA11 *fpa11 = GET_FPA11();
+ FPREG *rFd;
+ unsigned int nType, nDest, nRc;
+
+ /* Get the destination size. If not valid let Linux perform
+ an invalid instruction trap. */
+ nDest = getDestinationSize(opcode);
+ if (typeNone == nDest)
+ return 0;
+
+ SetRoundingMode(opcode);
+
+ /* Compare the size of the operands in Fn and Fm.
+ Choose the largest size and perform operations in that size,
+ in order to make use of all the precision of the operands.
+ If Fm is a constant, we just grab a constant of a size
+ matching the size of the operand in Fn. */
+ if (MONADIC_INSTRUCTION(opcode))
+ nType = nDest;
+ else
+ nType = fpa11->fType[getFn(opcode)];
+
+ if (!CONSTANT_FM(opcode)) {
+ register unsigned int Fm = getFm(opcode);
+ if (nType < fpa11->fType[Fm]) {
+ nType = fpa11->fType[Fm];
+ }
+ }
+
+ rFd = &fpa11->fpreg[getFd(opcode)];
+
+ switch (nType) {
+ case typeSingle:
+ nRc = SingleCPDO(opcode, rFd);
+ break;
+ case typeDouble:
+ nRc = DoubleCPDO(opcode, rFd);
+ break;
+#ifdef CONFIG_FPE_NWFPE_XP
+ case typeExtended:
+ nRc = ExtendedCPDO(opcode, rFd);
+ break;
+#endif
+ default:
+ nRc = 0;
+ }
+
+ /* The CPDO functions used to always set the destination type
+ to be the same as their working size. */
+
+ if (nRc != 0) {
+ /* If the operation succeeded, check to see if the result in the
+ destination register is the correct size. If not force it
+ to be. */
+
+ fpa11->fType[getFd(opcode)] = nDest;
+
+#ifdef CONFIG_FPE_NWFPE_XP
+ if (nDest != nType) {
+ switch (nDest) {
+ case typeSingle:
+ {
+ if (typeDouble == nType)
+ rFd->fSingle = float64_to_float32(rFd->fDouble);
+ else
+ rFd->fSingle = floatx80_to_float32(rFd->fExtended);
+ }
+ break;
+
+ case typeDouble:
+ {
+ if (typeSingle == nType)
+ rFd->fDouble = float32_to_float64(rFd->fSingle);
+ else
+ rFd->fDouble = floatx80_to_float64(rFd->fExtended);
+ }
+ break;
+
+ case typeExtended:
+ {
+ if (typeSingle == nType)
+ rFd->fExtended = float32_to_floatx80(rFd->fSingle);
+ else
+ rFd->fExtended = float64_to_floatx80(rFd->fDouble);
+ }
+ break;
+ }
+ }
+#else
+ if (nDest != nType) {
+ if (nDest == typeSingle)
+ rFd->fSingle = float64_to_float32(rFd->fDouble);
+ else
+ rFd->fDouble = float32_to_float64(rFd->fSingle);
+ }
+#endif
+ }
+
+ return nRc;
+}