[Qemu-devel] [PATCH 14/14] Add vrsqrtefp instruction

[Nathan Froyd]

Signed-off-by: Nathan Froyd <address@hidden>
---
 target-ppc/helper.h    |    1 +
 target-ppc/op_helper.c |   28 ++++++++++++++++++++++++++++
 target-ppc/translate.c |    1 +
 3 files changed, 30 insertions(+), 0 deletions(-)

diff --git a/target-ppc/helper.h b/target-ppc/helper.h
index 516cee0..179f077 100644
--- a/target-ppc/helper.h
+++ b/target-ppc/helper.h
@@ -245,6 +245,7 @@ DEF_HELPER_3(vsubfp, void, avr, avr, avr)
 DEF_HELPER_3(vmaxfp, void, avr, avr, avr)
 DEF_HELPER_3(vminfp, void, avr, avr, avr)
 DEF_HELPER_2(vrefp, void, avr, avr)
+DEF_HELPER_2(vrsqrtefp, void, avr, avr)
 DEF_HELPER_2(vrfim, void, avr, avr)
 DEF_HELPER_2(vrfin, void, avr, avr)
 DEF_HELPER_2(vrfip, void, avr, avr)
diff --git a/target-ppc/op_helper.c b/target-ppc/op_helper.c
index 8055e1a..4ef0b1c 100644
--- a/target-ppc/op_helper.c
+++ b/target-ppc/op_helper.c
@@ -2756,6 +2756,34 @@ VROTATE(h, u16)
 VROTATE(w, u32)
 #undef VROTATE
 
+void helper_vrsqrtefp (ppc_avr_t *r, ppc_avr_t *b)
+{
+    int i;
+    for (i = 0; i < ARRAY_SIZE(r->f); i++) {
+        HANDLE_NAN1(r->f[i], b->f[i]) {
+            if (float32_is_zero(b->f[i])) {
+                if (float32_is_neg(b->f[i])) {
+                    /* Negative infinity */
+                    r->u32[i] = 0xff800000;
+                } else {
+                    /* Positive infinity */
+                    r->u32[i] = 0x7f800000;
+                }
+            } else if (float32_is_neg(b->f[i])) {
+                /* Canonical QNaN */
+                r->u32[i] = 0x7fc00000;
+            } else if (float32_is_infinity(b->f[i])) {
+                /* Negative infinity handled earlier */
+                r->f[i] = float32_zero;
+            } else {
+                float32 one = int32_to_float32(1, &env->vec_status);
+                float32 t = float32_sqrt(b->f[i], &env->vec_status);
+                r->f[i] = float32_div(one, t, &env->vec_status);
+            }
+        }
+    }
+}
+
 void helper_vsel (ppc_avr_t *r, ppc_avr_t *a, ppc_avr_t *b, ppc_avr_t *c)
 {
     r->u64[0] = (a->u64[0] & ~c->u64[0]) | (b->u64[0] & c->u64[0]);
diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index 01a4f11..1c44c59 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -6477,6 +6477,7 @@ GEN_VXFORM_NOA(vupklsh, 7, 11);
 GEN_VXFORM_NOA(vupkhpx, 7, 13);
 GEN_VXFORM_NOA(vupklpx, 7, 15);
 GEN_VXFORM_NOA(vrefp, 5, 4);
+GEN_VXFORM_NOA(vrsqrtefp, 5, 5);
 GEN_VXFORM_NOA(vrfim, 5, 8);
 GEN_VXFORM_NOA(vrfin, 5, 9);
 GEN_VXFORM_NOA(vrfip, 5, 10);
-- 
1.6.0.5