[PATCH v4 13/16] target/riscv: compressed encodings for sspush and sspopchk

[Deepak Gupta]

sspush/sspopchk have compressed encodings carved out of zcmops.
compressed sspush is designated as c.mop.1 while compressed sspopchk
is designated as c.mop.5.

Note that c.sspush x1 exists while c.sspush x5 doesn't. Similarly
c.sspopchk x5 exists while c.sspopchk x1 doesn't.

Signed-off-by: Deepak Gupta <debug@rivosinc.com>
Co-developed-by: Jim Shu <jim.shu@sifive.com>
Co-developed-by: Andy Chiu <andy.chiu@sifive.com>
---
 target/riscv/insn16.decode                    |  2 ++
 target/riscv/insn_trans/trans_rvzicfiss.c.inc | 12 ++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/target/riscv/insn16.decode b/target/riscv/insn16.decode
index 3953bcf82d..3b84a36233 100644
--- a/target/riscv/insn16.decode
+++ b/target/riscv/insn16.decode
@@ -140,6 +140,8 @@ sw                110  ... ... .. ... 00 @cs_w
 addi              000 .  .....  ..... 01 @ci
 addi              010 .  .....  ..... 01 @c_li
 {
+  c_sspush        011 0  00001  00000 01 rs2=1 rs1=0 # c.sspush x1 carving out 
of zcmops
+  c_sspopchk      011 0  00101  00000 01 rs1=5 rd=0 # c.sspopchk x5 carving 
out of zcmops
   c_mop_n         011 0 0 n:3 1 00000 01
   illegal         011 0  -----  00000 01 # c.addi16sp and c.lui, RES nzimm=0
   addi            011 .  00010  ..... 01 @c_addi16sp
diff --git a/target/riscv/insn_trans/trans_rvzicfiss.c.inc 
b/target/riscv/insn_trans/trans_rvzicfiss.c.inc
index 05d439c1f6..67f5c7804a 100644
--- a/target/riscv/insn_trans/trans_rvzicfiss.c.inc
+++ b/target/riscv/insn_trans/trans_rvzicfiss.c.inc
@@ -109,3 +109,15 @@ static bool trans_sspush(DisasContext *ctx, arg_sspush *a)
 {
     return gen_sspush(ctx, a->rs2);
 }
+
+static bool trans_c_sspopchk(DisasContext *ctx, arg_c_sspopchk *a)
+{
+    assert(a->rs1 == 5);
+    return gen_sspopchk(ctx, a->rs1);
+}
+
+static bool trans_c_sspush(DisasContext *ctx, arg_c_sspush *a)
+{
+    assert(a->rs2 == 1);
+    return gen_sspush(ctx, a->rs2);
+}
-- 
2.44.0