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>

diff --git a/target-ppc/helper.h b/target-ppc/helper.h
index 9703f8502cf8fd55d0f6a076a8e6df60928a1eff..8eada2f8895966587e4821bcbbcc1868cae62b3f 100644 (file)
--- a/target-ppc/helper.h
+++ b/target-ppc/helper.h
@@ -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)

diff --git a/target-ppc/int_helper.c b/target-ppc/int_helper.c
index 12fe1448fa536a9a4b3e39a895c660407f54e901..552b2e041b185506af5dbb5abe43a20a754916b0 100644 (file)
--- a/target-ppc/int_helper.c
+++ b/target-ppc/int_helper.c
@@ -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;

diff --git a/target-ppc/translate/vmx-impl.c b/target-ppc/translate/vmx-impl.c
index e97966875019120eb8c64acf0f9310e339daad40..b9841222ea332bb38da6ff3b9343f6659884c87d 100644 (file)
--- a/target-ppc/translate/vmx-impl.c
+++ b/target-ppc/translate/vmx-impl.c
@@ -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);

diff --git a/target-ppc/translate/vmx-ops.c b/target-ppc/translate/vmx-ops.c
index 61e08b2f2d545f7923fbf8c8bf72da070037f06f..2a9f225e6abf6ca0e1c26454f94c5729367ae949 100644 (file)
--- a/target-ppc/translate/vmx-ops.c
+++ b/target-ppc/translate/vmx-ops.c
@@ -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),