target/ppc: Implement xxpermx instruction

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
Message-Id: <20220225210936.1749575-33-matheus.ferst@eldorado.org.br>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

1 files changed, 20 insertions, 0 deletions

diff --git a/target/ppc/int_helper.c b/target/ppc/int_helper.c
index 6c63c7b..d9bfdc2 100644
--- a/target/ppc/int_helper.c
+++ b/target/ppc/int_helper.c
@@ -1015,6 +1015,26 @@ VMUL(UW, u32, VsrW, VsrD, uint64_t)
 #undef VMUL_DO_ODD
 #undef VMUL
 
+void helper_XXPERMX(ppc_vsr_t *t, ppc_vsr_t *s0, ppc_vsr_t *s1, ppc_vsr_t *pcv,
+                    target_ulong uim)
+{
+    int i, idx;
+    ppc_vsr_t tmp = { .u64 = {0, 0} };
+
+    for (i = 0; i < ARRAY_SIZE(t->u8); i++) {
+        if ((pcv->VsrB(i) >> 5) == uim) {
+            idx = pcv->VsrB(i) & 0x1f;
+            if (idx < ARRAY_SIZE(t->u8)) {
+                tmp.VsrB(i) = s0->VsrB(idx);
+            } else {
+                tmp.VsrB(i) = s1->VsrB(idx - ARRAY_SIZE(t->u8));
+            }
+        }
+    }
+
+    *t = tmp;
+}
+
 void helper_VPERM(ppc_avr_t *r, ppc_avr_t *a, ppc_avr_t *b, ppc_avr_t *c)
 {
     ppc_avr_t result;