[Qemu-devel] [PATCH v1 6/7] s390x/tcg: Implement LOAD LENGTHENED short HFP to long HFP

[David Hildenbrand <david@redhat.com>]

Nice trick to load a 32 bit value into vector element 0 (32 bit element
size) from memory, zeroing out element1. The short HFP to long HFP
conversion really only is a shift.

Signed-off-by: David Hildenbrand <david@redhat.com>
---
 target/s390x/insn-data.def | 2 ++
 target/s390x/translate.c   | 6 ++++++
 2 files changed, 8 insertions(+)

diff --git a/target/s390x/insn-data.def b/target/s390x/insn-data.def
index 61582372ab..fb6ee18650 100644
--- a/target/s390x/insn-data.def
+++ b/target/s390x/insn-data.def
@@ -598,6 +598,8 @@
     F(0xed04, LDEB,    RXE,   Z,   0, m2_32u, new, f1, ldeb, 0, IF_BFP)
     F(0xed05, LXDB,    RXE,   Z,   0, m2_64, new_P, x1, lxdb, 0, IF_BFP)
     F(0xed06, LXEB,    RXE,   Z,   0, m2_32u, new_P, x1, lxeb, 0, IF_BFP)
+    F(0xb324, LDER,    RXE,   Z,   0, e2, new, f1, lde, 0, IF_AFP1)
+    F(0xed24, LDE,     RXE,   Z,   0, m2_32u, new, f1, lde, 0, IF_AFP1)
 /* LOAD ROUNDED */
     F(0xb344, LEDBR,   RRE,   Z,   0, f2, new, e1, ledb, 0, IF_BFP)
     F(0xb345, LDXBR,   RRE,   Z,   x2h, x2l, new, f1, ldxb, 0, IF_BFP)
diff --git a/target/s390x/translate.c b/target/s390x/translate.c
index 322fbbdf81..34799a8704 100644
--- a/target/s390x/translate.c
+++ b/target/s390x/translate.c
@@ -2724,6 +2724,12 @@ static DisasJumpType op_lxeb(DisasContext *s, DisasOps *o)
     return DISAS_NEXT;
 }
 
+static DisasJumpType op_lde(DisasContext *s, DisasOps *o)
+{
+    tcg_gen_shli_i64(o->out, o->in2, 32);
+    return DISAS_NEXT;
+}
+
 static DisasJumpType op_llgt(DisasContext *s, DisasOps *o)
 {
     tcg_gen_andi_i64(o->out, o->in2, 0x7fffffff);
-- 
2.17.2