target/arm: Implement SVE2 PMULLB, PMULLT

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210525010358.152808-15-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

target/arm/cpu.h

@@ -4241,6 +4241,16 @@ static inline bool isar_feature_aa64_sve2(const ARMISARegisters *id)
     return FIELD_EX64(id->id_aa64zfr0, ID_AA64ZFR0, SVEVER) != 0;
 }
 
+static inline bool isar_feature_aa64_sve2_aes(const ARMISARegisters *id)
+{
+    return FIELD_EX64(id->id_aa64zfr0, ID_AA64ZFR0, AES) != 0;
+}
+
+static inline bool isar_feature_aa64_sve2_pmull128(const ARMISARegisters *id)
+{
+    return FIELD_EX64(id->id_aa64zfr0, ID_AA64ZFR0, AES) >= 2;
+}
+
 /*
  * Feature tests for "does this exist in either 32-bit or 64-bit?"
  */

target/arm/helper-sve.h

@@ -2363,3 +2363,4 @@ DEF_HELPER_FLAGS_4(sve2_umull_zzz_s, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, i32)
 DEF_HELPER_FLAGS_4(sve2_umull_zzz_d, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, i32)
 
 DEF_HELPER_FLAGS_4(sve2_pmull_h, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(sve2_pmull_d, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, i32)

target/arm/sve.decode

@@ -1201,6 +1201,8 @@ USUBWT          01000101 .. 0 ..... 010 111 ..... .....  @rd_rn_rm
 
 SQDMULLB_zzz    01000101 .. 0 ..... 011 000 ..... .....  @rd_rn_rm
 SQDMULLT_zzz    01000101 .. 0 ..... 011 001 ..... .....  @rd_rn_rm
+PMULLB          01000101 .. 0 ..... 011 010 ..... .....  @rd_rn_rm
+PMULLT          01000101 .. 0 ..... 011 011 ..... .....  @rd_rn_rm
 SMULLB_zzz      01000101 .. 0 ..... 011 100 ..... .....  @rd_rn_rm
 SMULLT_zzz      01000101 .. 0 ..... 011 101 ..... .....  @rd_rn_rm
 UMULLB_zzz      01000101 .. 0 ..... 011 110 ..... .....  @rd_rn_rm

target/arm/translate-sve.c

@@ -6030,6 +6030,28 @@ DO_SVE2_ZZZ_TB(SMULLT_zzz, smull_zzz, true, true)
 DO_SVE2_ZZZ_TB(UMULLB_zzz, umull_zzz, false, false)
 DO_SVE2_ZZZ_TB(UMULLT_zzz, umull_zzz, true, true)
 
+static bool do_trans_pmull(DisasContext *s, arg_rrr_esz *a, bool sel)
+{
+    static gen_helper_gvec_3 * const fns[4] = {
+        gen_helper_gvec_pmull_q, gen_helper_sve2_pmull_h,
+        NULL,                    gen_helper_sve2_pmull_d,
+    };
+    if (a->esz == 0 && !dc_isar_feature(aa64_sve2_pmull128, s)) {
+        return false;
+    }
+    return do_sve2_zzw_ool(s, a, fns[a->esz], sel);
+}
+
+static bool trans_PMULLB(DisasContext *s, arg_rrr_esz *a)
+{
+    return do_trans_pmull(s, a, false);
+}
+
+static bool trans_PMULLT(DisasContext *s, arg_rrr_esz *a)
+{
+    return do_trans_pmull(s, a, true);
+}
+
 #define DO_SVE2_ZZZ_WTB(NAME, name, SEL2) \
 static bool trans_##NAME(DisasContext *s, arg_rrr_esz *a)       \
 {                                                               \

target/arm/vec_helper.c

@@ -1750,6 +1750,30 @@ void HELPER(sve2_pmull_h)(void *vd, void *vn, void *vm, uint32_t desc)
         d[i] = pmull_h(nn, mm);
     }
 }
+
+static uint64_t pmull_d(uint64_t op1, uint64_t op2)
+{
+    uint64_t result = 0;
+    int i;
+
+    for (i = 0; i < 32; ++i) {
+        uint64_t mask = -((op1 >> i) & 1);
+        result ^= (op2 << i) & mask;
+    }
+    return result;
+}
+
+void HELPER(sve2_pmull_d)(void *vd, void *vn, void *vm, uint32_t desc)
+{
+    intptr_t sel = H4(simd_data(desc));
+    intptr_t i, opr_sz = simd_oprsz(desc);
+    uint32_t *n = vn, *m = vm;
+    uint64_t *d = vd;
+
+    for (i = 0; i < opr_sz / 8; ++i) {
+        d[i] = pmull_d(n[2 * i + sel], m[2 * i + sel]);
+    }
+}
 #endif
 
 #define DO_CMP0(NAME, TYPE, OP)                         \