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target-ppc: add vsrv instruction 

Adds Vector Shift Right Variable instruction.

Signed-off-by: Vivek Andrew Sha <vivekandrewsha@gmail.com>
[ reverse the order of computation to avoid temporary array ]
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Vivek Andrew Sha 2016-07-28 23:44:17 +05:30 committed by David Gibson
parent 5644a17567
commit 4004c1dbca
4 changed files with 20 additions and 0 deletions
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1
target-ppc/helper.h
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@ -211,6 +211,7 @@ DEF_HELPER_3(vslw, void, avr, avr, avr)
DEF_HELPER_3(vsld, void, avr, avr, avr)
DEF_HELPER_3(vslo, void, avr, avr, avr)
DEF_HELPER_3(vsro, void, avr, avr, avr)
DEF_HELPER_3(vsrv, void, avr, avr, avr)
DEF_HELPER_3(vslv, void, avr, avr, avr)
DEF_HELPER_3(vaddcuw, void, avr, avr, avr)
DEF_HELPER_3(vsubcuw, void, avr, avr, avr)

17
target-ppc/int_helper.c
View File

@ -1710,6 +1710,23 @@ void helper_vslv(ppc_avr_t *r, ppc_avr_t *a, ppc_avr_t *b)
}
}
void helper_vsrv(ppc_avr_t *r, ppc_avr_t *a, ppc_avr_t *b)
{
int i;
unsigned int shift, bytes;
/* Use reverse order, as destination and source register can be same. Its
* being modified in place saving temporary, reverse order will guarantee
* that computed result is not fed back.
*/
for (i = ARRAY_SIZE(r->u8) - 1; i >= 0; i--) {
shift = b->u8[i] & 0x7; /* extract shift value */
bytes = ((i ? a->u8[i - 1] : 0) << 8) + a->u8[i];
/* extract adjacent bytes */
r->u8[i] = (bytes >> shift) & 0xFF; /* shift and store result */
}
}
void helper_vsldoi(ppc_avr_t *r, ppc_avr_t *a, ppc_avr_t *b, uint32_t shift)
{
int sh = shift & 0xf;

1
target-ppc/translate/vmx-impl.c
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@ -383,6 +383,7 @@ GEN_VXFORM(vsrab, 2, 12);
GEN_VXFORM(vsrah, 2, 13);
GEN_VXFORM(vsraw, 2, 14);
GEN_VXFORM(vsrad, 2, 15);
GEN_VXFORM(vsrv, 2, 28);
GEN_VXFORM(vslv, 2, 29);
GEN_VXFORM(vslo, 6, 16);
GEN_VXFORM(vsro, 6, 17);

1
target-ppc/translate/vmx-ops.c
View File

@ -110,6 +110,7 @@ GEN_VXFORM(vsrab, 2, 12),
GEN_VXFORM(vsrah, 2, 13),
GEN_VXFORM(vsraw, 2, 14),
GEN_VXFORM_207(vsrad, 2, 15),
GEN_VXFORM_300(vsrv, 2, 28),
GEN_VXFORM_300(vslv, 2, 29),
GEN_VXFORM(vslo, 6, 16),
GEN_VXFORM(vsro, 6, 17),