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

[Nathan Froyd <froydnj@codesourcery.com>]

Use float32_one constant to avoid repeated conversions.  Let the
softfloat code handle any special cases.

Signed-off-by: Nathan Froyd <froydnj@codesourcery.com>
---
 target-ppc/helper.h    |    1 +
 target-ppc/op_helper.c |   11 +++++++++++
 target-ppc/translate.c |    1 +
 3 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/target-ppc/helper.h b/target-ppc/helper.h
index 00a573c..85cdd23 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_4(vmaddfp, void, avr, avr, avr, avr)
 DEF_HELPER_4(vnmsubfp, void, avr, avr, avr, avr)
 DEF_HELPER_2(vlogefp, void, avr, avr)
diff --git a/target-ppc/op_helper.c b/target-ppc/op_helper.c
index 0e78e23..3afd217 100644
--- a/target-ppc/op_helper.c
+++ b/target-ppc/op_helper.c
@@ -2707,6 +2707,17 @@ 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]) {
+            float32 t = float32_sqrt(b->f[i], &env->vec_status);
+            r->f[i] = float32_div(float32_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 46bd177..048bb54 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(vlogefp, 5, 7);
 GEN_VXFORM_NOA(vrfim, 5, 8);
 GEN_VXFORM_NOA(vrfin, 5, 9);
-- 
1.6.0.5