[PULL 079/114] target/arm: Implement SVE2 saturating multiply (indexed)

[Peter Maydell <peter.maydell@linaro.org>]

From: Richard Henderson <richard.henderson@linaro.org>

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210525010358.152808-58-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/helper-sve.h    |  5 +++++
 target/arm/sve.decode      | 12 ++++++++++++
 target/arm/sve_helper.c    | 20 ++++++++++++++++++++
 target/arm/translate-sve.c | 14 ++++++++++++++
 4 files changed, 51 insertions(+)

diff --git a/target/arm/helper-sve.h b/target/arm/helper-sve.h
index 08398800bd7..0be0d90bee7 100644
--- a/target/arm/helper-sve.h
+++ b/target/arm/helper-sve.h
@@ -2688,3 +2688,8 @@ DEF_HELPER_FLAGS_5(sve2_sqdmlsl_idx_s, TCG_CALL_NO_RWG,
                    void, ptr, ptr, ptr, ptr, i32)
 DEF_HELPER_FLAGS_5(sve2_sqdmlsl_idx_d, TCG_CALL_NO_RWG,
                    void, ptr, ptr, ptr, ptr, i32)
+
+DEF_HELPER_FLAGS_4(sve2_sqdmull_idx_s, TCG_CALL_NO_RWG,
+                   void, ptr, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(sve2_sqdmull_idx_d, TCG_CALL_NO_RWG,
+                   void, ptr, ptr, ptr, i32)
diff --git a/target/arm/sve.decode b/target/arm/sve.decode
index 8d2709d3cc0..a3b9fb95f9c 100644
--- a/target/arm/sve.decode
+++ b/target/arm/sve.decode
@@ -255,6 +255,12 @@
 @rrx_2          ........ .. . index:2 rm:3 ...... rn:5 rd:5  &rrx_esz
 @rrx_1          ........ .. . index:1 rm:4 ...... rn:5 rd:5  &rrx_esz
 
+# Two registers and a scalar by N-bit index, alternate
+@rrx_3a         ........ .. . .. rm:3 ...... rn:5 rd:5 \
+                &rrx_esz index=%index3_19_11
+@rrx_2a         ........ .. . .  rm:4 ...... rn:5 rd:5 \
+                &rrx_esz index=%index2_20_11
+
 # Three registers and a scalar by N-bit index
 @rrxr_3         ........ .. . ..      rm:3 ...... rn:5 rd:5 \
                 &rrxr_esz ra=%reg_movprfx index=%index3_22_19
@@ -817,6 +823,12 @@ SQDMLSLB_zzxw_d 01000100 11 1 ..... 0011.0 ..... .....   @rrxr_2a esz=3
 SQDMLSLT_zzxw_s 01000100 10 1 ..... 0011.1 ..... .....   @rrxr_3a esz=2
 SQDMLSLT_zzxw_d 01000100 11 1 ..... 0011.1 ..... .....   @rrxr_2a esz=3
 
+# SVE2 saturating multiply (indexed)
+SQDMULLB_zzx_s  01000100 10 1 ..... 1110.0 ..... .....   @rrx_3a esz=2
+SQDMULLB_zzx_d  01000100 11 1 ..... 1110.0 ..... .....   @rrx_2a esz=3
+SQDMULLT_zzx_s  01000100 10 1 ..... 1110.1 ..... .....   @rrx_3a esz=2
+SQDMULLT_zzx_d  01000100 11 1 ..... 1110.1 ..... .....   @rrx_2a esz=3
+
 # SVE2 integer multiply (indexed)
 MUL_zzx_h       01000100 0. 1 ..... 111110 ..... .....   @rrx_3 esz=1
 MUL_zzx_s       01000100 10 1 ..... 111110 ..... .....   @rrx_2 esz=2
diff --git a/target/arm/sve_helper.c b/target/arm/sve_helper.c
index b80bd15085b..3953e2f502a 100644
--- a/target/arm/sve_helper.c
+++ b/target/arm/sve_helper.c
@@ -1565,6 +1565,26 @@ DO_ZZXW(sve2_sqdmlsl_idx_d, int64_t, int32_t,     , H1_4, DO_SQDMLSL_D)
 
 #undef DO_ZZXW
 
+#define DO_ZZX(NAME, TYPEW, TYPEN, HW, HN, OP) \
+void HELPER(NAME)(void *vd, void *vn, void *vm, uint32_t desc)            \
+{                                                                         \
+    intptr_t i, j, oprsz = simd_oprsz(desc);                              \
+    intptr_t sel = extract32(desc, SIMD_DATA_SHIFT, 1) * sizeof(TYPEN);   \
+    intptr_t idx = extract32(desc, SIMD_DATA_SHIFT + 1, 3) * sizeof(TYPEN); \
+    for (i = 0; i < oprsz; i += 16) {                                     \
+        TYPEW mm = *(TYPEN *)(vm + HN(i + idx));                          \
+        for (j = 0; j < 16; j += sizeof(TYPEW)) {                         \
+            TYPEW nn = *(TYPEN *)(vn + HN(i + j + sel));                  \
+            *(TYPEW *)(vd + HW(i + j)) = OP(nn, mm);                      \
+        }                                                                 \
+    }                                                                     \
+}
+
+DO_ZZX(sve2_sqdmull_idx_s, int32_t, int16_t, H1_4, H1_2, do_sqdmull_s)
+DO_ZZX(sve2_sqdmull_idx_d, int64_t, int32_t,     , H1_4, do_sqdmull_d)
+
+#undef DO_ZZX
+
 #define DO_BITPERM(NAME, TYPE, OP) \
 void HELPER(NAME)(void *vd, void *vn, void *vm, uint32_t desc) \
 {                                                              \
diff --git a/target/arm/translate-sve.c b/target/arm/translate-sve.c
index 3e7f310d595..c009ec54ff5 100644
--- a/target/arm/translate-sve.c
+++ b/target/arm/translate-sve.c
@@ -3866,6 +3866,20 @@ DO_SVE2_RRX(trans_MUL_zzx_d, gen_helper_gvec_mul_idx_d)
 
 #undef DO_SVE2_RRX
 
+#define DO_SVE2_RRX_TB(NAME, FUNC, TOP) \
+    static bool NAME(DisasContext *s, arg_rrx_esz *a)           \
+    {                                                           \
+        return do_sve2_zzz_data(s, a->rd, a->rn, a->rm,         \
+                                (a->index << 1) | TOP, FUNC);   \
+    }
+
+DO_SVE2_RRX_TB(trans_SQDMULLB_zzx_s, gen_helper_sve2_sqdmull_idx_s, false)
+DO_SVE2_RRX_TB(trans_SQDMULLB_zzx_d, gen_helper_sve2_sqdmull_idx_d, false)
+DO_SVE2_RRX_TB(trans_SQDMULLT_zzx_s, gen_helper_sve2_sqdmull_idx_s, true)
+DO_SVE2_RRX_TB(trans_SQDMULLT_zzx_d, gen_helper_sve2_sqdmull_idx_d, true)
+
+#undef DO_SVE2_RRX_TB
+
 static bool do_sve2_zzzz_data(DisasContext *s, int rd, int rn, int rm, int ra,
                               int data, gen_helper_gvec_4 *fn)
 {
-- 
2.20.1