target/arm: Implement SVE2 integer add/subtract long with carry

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210525010358.152808-21-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

4 files changed, 66 insertions, 0 deletions

diff --git a/target/arm/helper-sve.h b/target/arm/helper-sve.h
index 229fb396b2..4a62012850 100644
--- a/target/arm/helper-sve.h
+++ b/target/arm/helper-sve.h
@@ -2416,3 +2416,6 @@ DEF_HELPER_FLAGS_5(sve2_uabal_s, TCG_CALL_NO_RWG,
                    void, ptr, ptr, ptr, ptr, i32)
 DEF_HELPER_FLAGS_5(sve2_uabal_d, TCG_CALL_NO_RWG,
                    void, ptr, ptr, ptr, ptr, i32)
+
+DEF_HELPER_FLAGS_5(sve2_adcl_s, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, ptr, i32)
+DEF_HELPER_FLAGS_5(sve2_adcl_d, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, ptr, i32)
diff --git a/target/arm/sve.decode b/target/arm/sve.decode
index 56b7353bfa..79046d81e3 100644
--- a/target/arm/sve.decode
+++ b/target/arm/sve.decode
@@ -1247,3 +1247,9 @@ SABALB          01000101 .. 0 ..... 1100 00 ..... .....  @rda_rn_rm
 SABALT          01000101 .. 0 ..... 1100 01 ..... .....  @rda_rn_rm
 UABALB          01000101 .. 0 ..... 1100 10 ..... .....  @rda_rn_rm
 UABALT          01000101 .. 0 ..... 1100 11 ..... .....  @rda_rn_rm
+
+## SVE2 integer add/subtract long with carry
+
+# ADC and SBC decoded via size in helper dispatch.
+ADCLB           01000101 .. 0 ..... 11010 0 ..... .....  @rda_rn_rm
+ADCLT           01000101 .. 0 ..... 11010 1 ..... .....  @rda_rn_rm
diff --git a/target/arm/sve_helper.c b/target/arm/sve_helper.c
index 5d084a1164..b63d84eef4 100644
--- a/target/arm/sve_helper.c
+++ b/target/arm/sve_helper.c
@@ -1269,6 +1269,40 @@ DO_ZZZW_ACC(sve2_uabal_d, uint64_t, uint32_t,     , H1_4, DO_ABD)
 
 #undef DO_ZZZW_ACC
 
+void HELPER(sve2_adcl_s)(void *vd, void *vn, void *vm, void *va, uint32_t desc)
+{
+    intptr_t i, opr_sz = simd_oprsz(desc);
+    int sel = H4(extract32(desc, SIMD_DATA_SHIFT, 1));
+    uint32_t inv = -extract32(desc, SIMD_DATA_SHIFT + 1, 1);
+    uint32_t *a = va, *n = vn;
+    uint64_t *d = vd, *m = vm;
+
+    for (i = 0; i < opr_sz / 8; ++i) {
+        uint32_t e1 = a[2 * i + H4(0)];
+        uint32_t e2 = n[2 * i + sel] ^ inv;
+        uint64_t c = extract64(m[i], 32, 1);
+        /* Compute and store the entire 33-bit result at once. */
+        d[i] = c + e1 + e2;
+    }
+}
+
+void HELPER(sve2_adcl_d)(void *vd, void *vn, void *vm, void *va, uint32_t desc)
+{
+    intptr_t i, opr_sz = simd_oprsz(desc);
+    int sel = extract32(desc, SIMD_DATA_SHIFT, 1);
+    uint64_t inv = -(uint64_t)extract32(desc, SIMD_DATA_SHIFT + 1, 1);
+    uint64_t *d = vd, *a = va, *n = vn, *m = vm;
+
+    for (i = 0; i < opr_sz / 8; i += 2) {
+        Int128 e1 = int128_make64(a[i]);
+        Int128 e2 = int128_make64(n[i + sel] ^ inv);
+        Int128 c = int128_make64(m[i + 1] & 1);
+        Int128 r = int128_add(int128_add(e1, e2), c);
+        d[i + 0] = int128_getlo(r);
+        d[i + 1] = int128_gethi(r);
+    }
+}
+
 #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 c41464ba22..cf4fa50ad2 100644
--- a/target/arm/translate-sve.c
+++ b/target/arm/translate-sve.c
@@ -6371,3 +6371,26 @@ static bool trans_UABALT(DisasContext *s, arg_rrrr_esz *a)
 {
     return do_abal(s, a, true, true);
 }
+
+static bool do_adcl(DisasContext *s, arg_rrrr_esz *a, bool sel)
+{
+    static gen_helper_gvec_4 * const fns[2] = {
+        gen_helper_sve2_adcl_s,
+        gen_helper_sve2_adcl_d,
+    };
+    /*
+     * Note that in this case the ESZ field encodes both size and sign.
+     * Split out 'subtract' into bit 1 of the data field for the helper.
+     */
+    return do_sve2_zzzz_ool(s, a, fns[a->esz & 1], (a->esz & 2) | sel);
+}
+
+static bool trans_ADCLB(DisasContext *s, arg_rrrr_esz *a)
+{
+    return do_adcl(s, a, false);
+}
+
+static bool trans_ADCLT(DisasContext *s, arg_rrrr_esz *a)
+{
+    return do_adcl(s, a, true);
+}