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target-arm: A64: add support for 2-src data processing and DIV

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This patch adds support for decoding 2-src data processing insns,
and the first users, UDIV and SDIV.

Signed-off-by: Alexander Graf <agraf@suse.de>
[claudio: adapted to new decoder adding the 2-src decoding level,
          always zero-extend result in 32bit mode]
Signed-off-by: Claudio Fontana <claudio.fontana@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Alexander Graf 2013-12-17 19:42:34 +00:00 • committed by Peter Maydell
parent e801de93d0
commit 8220e911c2
3 changed files with 93 additions and 2 deletions
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21
target-arm/helper-a64.c
View file

@ -23,3 +23,24 @@
#include "qemu/host-utils.h"
#include "sysemu/sysemu.h"
#include "qemu/bitops.h"
/* C2.4.7 Multiply and divide */
/* special cases for 0 and LLONG_MIN are mandated by the standard */
uint64_t HELPER(udiv64)(uint64_t num, uint64_t den)
{
if (den == 0) {
return 0;
}
return num / den;
}
int64_t HELPER(sdiv64)(int64_t num, int64_t den)
{
if (den == 0) {
return 0;
}
if (num == LLONG_MIN && den == -1) {
return LLONG_MIN;
}
return num / den;
}