[Qemu-devel] [PATCH 07/14] Add v{add,sub}fp instructions

[Nathan Froyd <froydnj@codesourcery.com>]

Split up vaddfp and vsubfp so that we can properly handle magnitude
subtraction of infinities.

Signed-off-by: Nathan Froyd <froydnj@codesourcery.com>
---
 target-ppc/helper.h    |    2 ++
 target-ppc/op_helper.c |   27 +++++++++++++++++++++++++++
 target-ppc/translate.c |    2 ++
 3 files changed, 31 insertions(+), 0 deletions(-)

diff --git a/target-ppc/helper.h b/target-ppc/helper.h
index ebdeabe..a5d1972 100644
--- a/target-ppc/helper.h
+++ b/target-ppc/helper.h
@@ -232,6 +232,8 @@ DEF_HELPER_3(vsum2sws, void, avr, avr, avr)
 DEF_HELPER_3(vsum4sbs, void, avr, avr, avr)
 DEF_HELPER_3(vsum4shs, void, avr, avr, avr)
 DEF_HELPER_3(vsum4ubs, void, avr, avr, avr)
+DEF_HELPER_3(vaddfp, void, avr, avr, avr)
+DEF_HELPER_3(vsubfp, void, avr, avr, avr)
 DEF_HELPER_3(vmaxfp, void, avr, avr, avr)
 DEF_HELPER_3(vminfp, void, avr, avr, avr)
 
diff --git a/target-ppc/op_helper.c b/target-ppc/op_helper.c
index 717bbd4..d952113 100644
--- a/target-ppc/op_helper.c
+++ b/target-ppc/op_helper.c
@@ -2102,6 +2102,33 @@ VARITH(uwm, u32)
 #undef VARITH_DO
 #undef VARITH
 
+void helper_vaddfp (ppc_avr_t *r, ppc_avr_t *a, ppc_avr_t *b)
+{
+    int i;
+    for (i = 0; i < ARRAY_SIZE(r->f); i++) {
+        HANDLE_NAN2(r->f[i], a->f[i], b->f[i]) {
+            r->f[i] = float32_add(a->f[i], b->f[i], &env->vec_status);
+        }
+    }
+}
+
+void helper_vsubfp (ppc_avr_t *r, ppc_avr_t *a, ppc_avr_t *b)
+{
+    int i;
+    for (i = 0; i < ARRAY_SIZE(r->f); i++) {
+        HANDLE_NAN2(r->f[i], a->f[i], b->f[i]) {
+            if (unlikely(float32_is_infinity(a->f[i]) &&
+                         float32_is_infinity(b->f[i]) &&
+                         float32_is_neg(a->f[i]) == float32_is_neg(b->f[i]))) {
+                /* Magnitude subtraction of infinities */
+                r->u32[i] = 0x7fc00000;
+            } else {
+                r->f[i] = float32_sub(a->f[i], b->f[i], &env->vec_status);
+            }
+        }
+    }
+}
+
 #define VARITHSAT_CASE(type, op, cvt, element)                          \
     {                                                                   \
         type result = (type)a->element[i] op (type)b->element[i];       \
diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index 35693e0..6ff46e0 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -6395,6 +6395,8 @@ GEN_VXFORM(vsum4sbs, 4, 28);
 GEN_VXFORM(vsum4shs, 4, 25);
 GEN_VXFORM(vsum2sws, 4, 26);
 GEN_VXFORM(vsumsws, 4, 30);
+GEN_VXFORM(vaddfp, 5, 0);
+GEN_VXFORM(vsubfp, 5, 1);
 GEN_VXFORM(vmaxfp, 5, 10);
 GEN_VXFORM(vminfp, 5, 11);
 
-- 
1.6.0.5