[PATCH v4 17/45] target/arm: Implement SME RDSVL, ADDSVL, ADDSPL

[Richard Henderson <richard.henderson@linaro.org>]

These SME instructions are nominally within the SVE decode space,
so we add them to sve.decode and translate-sve.c.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
v4: Add streaming_{vec,pred}_reg_size.
---
 target/arm/translate-a64.h | 12 ++++++++++++
 target/arm/sve.decode      |  5 ++++-
 target/arm/translate-sve.c | 38 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 54 insertions(+), 1 deletion(-)

diff --git a/target/arm/translate-a64.h b/target/arm/translate-a64.h
index 02fb95e019..099d3d11d6 100644
--- a/target/arm/translate-a64.h
+++ b/target/arm/translate-a64.h
@@ -128,6 +128,12 @@ static inline int vec_full_reg_size(DisasContext *s)
     return s->vl;
 }
 
+/* Return the byte size of the vector register, SVL / 8. */
+static inline int streaming_vec_reg_size(DisasContext *s)
+{
+    return s->svl;
+}
+
 /*
  * Return the offset info CPUARMState of the predicate vector register Pn.
  * Note for this purpose, FFR is P16.
@@ -143,6 +149,12 @@ static inline int pred_full_reg_size(DisasContext *s)
     return s->vl >> 3;
 }
 
+/* Return the byte size of the predicate register, SVL / 64.  */
+static inline int streaming_pred_reg_size(DisasContext *s)
+{
+    return s->svl >> 3;
+}
+
 /*
  * Round up the size of a register to a size allowed by
  * the tcg vector infrastructure.  Any operation which uses this
diff --git a/target/arm/sve.decode b/target/arm/sve.decode
index 908643d7d9..95af08c139 100644
--- a/target/arm/sve.decode
+++ b/target/arm/sve.decode
@@ -449,14 +449,17 @@ INDEX_ri        00000100 esz:2 1 imm:s5 010001 rn:5 rd:5
 # SVE index generation (register start, register increment)
 INDEX_rr        00000100 .. 1 ..... 010011 ..... .....          @rd_rn_rm
 
-### SVE Stack Allocation Group
+### SVE / Streaming SVE Stack Allocation Group
 
 # SVE stack frame adjustment
 ADDVL           00000100 001 ..... 01010 ...... .....           @rd_rn_i6
+ADDSVL          00000100 001 ..... 01011 ...... .....           @rd_rn_i6
 ADDPL           00000100 011 ..... 01010 ...... .....           @rd_rn_i6
+ADDSPL          00000100 011 ..... 01011 ...... .....           @rd_rn_i6
 
 # SVE stack frame size
 RDVL            00000100 101 11111 01010 imm:s6 rd:5
+RDSVL           00000100 101 11111 01011 imm:s6 rd:5
 
 ### SVE Bitwise Shift - Unpredicated Group
 
diff --git a/target/arm/translate-sve.c b/target/arm/translate-sve.c
index e5e9e1e0ca..9e304f78bc 100644
--- a/target/arm/translate-sve.c
+++ b/target/arm/translate-sve.c
@@ -1286,6 +1286,19 @@ static bool trans_ADDVL(DisasContext *s, arg_ADDVL *a)
     return true;
 }
 
+static bool trans_ADDSVL(DisasContext *s, arg_ADDSVL *a)
+{
+    if (!dc_isar_feature(aa64_sme, s)) {
+        return false;
+    }
+    if (sme_enabled_check(s)) {
+        TCGv_i64 rd = cpu_reg_sp(s, a->rd);
+        TCGv_i64 rn = cpu_reg_sp(s, a->rn);
+        tcg_gen_addi_i64(rd, rn, a->imm * streaming_vec_reg_size(s));
+    }
+    return true;
+}
+
 static bool trans_ADDPL(DisasContext *s, arg_ADDPL *a)
 {
     if (!dc_isar_feature(aa64_sve, s)) {
@@ -1299,6 +1312,19 @@ static bool trans_ADDPL(DisasContext *s, arg_ADDPL *a)
     return true;
 }
 
+static bool trans_ADDSPL(DisasContext *s, arg_ADDSPL *a)
+{
+    if (!dc_isar_feature(aa64_sme, s)) {
+        return false;
+    }
+    if (sme_enabled_check(s)) {
+        TCGv_i64 rd = cpu_reg_sp(s, a->rd);
+        TCGv_i64 rn = cpu_reg_sp(s, a->rn);
+        tcg_gen_addi_i64(rd, rn, a->imm * streaming_pred_reg_size(s));
+    }
+    return true;
+}
+
 static bool trans_RDVL(DisasContext *s, arg_RDVL *a)
 {
     if (!dc_isar_feature(aa64_sve, s)) {
@@ -1311,6 +1337,18 @@ static bool trans_RDVL(DisasContext *s, arg_RDVL *a)
     return true;
 }
 
+static bool trans_RDSVL(DisasContext *s, arg_RDSVL *a)
+{
+    if (!dc_isar_feature(aa64_sme, s)) {
+        return false;
+    }
+    if (sme_enabled_check(s)) {
+        TCGv_i64 reg = cpu_reg(s, a->rd);
+        tcg_gen_movi_i64(reg, a->imm * streaming_vec_reg_size(s));
+    }
+    return true;
+}
+
 /*
  *** SVE Compute Vector Address Group
  */
-- 
2.34.1