target/arm: Split helper_crypto_sha1_3reg

Rather than passing an opcode to a helper, fully decode the
operation at translate time.  Use clear_tail_16 to zap the
balance of the SVE register with the AdvSIMD write.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20200514212831.31248-6-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

5 files changed, 95 insertions, 94 deletions

diff --git a/target/arm/crypto_helper.c b/target/arm/crypto_helper.c
index 7124745..636683d 100644
--- a/target/arm/crypto_helper.c
+++ b/target/arm/crypto_helper.c
@@ -24,11 +24,11 @@ union CRYPTO_STATE {
 };
 
 #ifdef HOST_WORDS_BIGENDIAN
-#define CR_ST_BYTE(state, i)   (state.bytes[(15 - (i)) ^ 8])
-#define CR_ST_WORD(state, i)   (state.words[(3 - (i)) ^ 2])
+#define CR_ST_BYTE(state, i)   ((state).bytes[(15 - (i)) ^ 8])
+#define CR_ST_WORD(state, i)   ((state).words[(3 - (i)) ^ 2])
 #else
-#define CR_ST_BYTE(state, i)   (state.bytes[i])
-#define CR_ST_WORD(state, i)   (state.words[i])
+#define CR_ST_BYTE(state, i)   ((state).bytes[i])
+#define CR_ST_WORD(state, i)   ((state).words[i])
 #endif
 
 /*
@@ -258,49 +258,74 @@ static uint32_t maj(uint32_t x, uint32_t y, uint32_t z)
     return (x & y) | ((x | y) & z);
 }
 
-void HELPER(crypto_sha1_3reg)(void *vd, void *vn, void *vm, uint32_t op)
+void HELPER(crypto_sha1su0)(void *vd, void *vn, void *vm, uint32_t desc)
+{
+    uint64_t *d = vd, *n = vn, *m = vm;
+    uint64_t d0, d1;
+
+    d0 = d[1] ^ d[0] ^ m[0];
+    d1 = n[0] ^ d[1] ^ m[1];
+    d[0] = d0;
+    d[1] = d1;
+
+    clear_tail_16(vd, desc);
+}
+
+static inline void crypto_sha1_3reg(uint64_t *rd, uint64_t *rn,
+                                    uint64_t *rm, uint32_t desc,
+                                    uint32_t (*fn)(union CRYPTO_STATE *d))
 {
-    uint64_t *rd = vd;
-    uint64_t *rn = vn;
-    uint64_t *rm = vm;
     union CRYPTO_STATE d = { .l = { rd[0], rd[1] } };
     union CRYPTO_STATE n = { .l = { rn[0], rn[1] } };
     union CRYPTO_STATE m = { .l = { rm[0], rm[1] } };
+    int i;
 
-    if (op == 3) { /* sha1su0 */
-        d.l[0] ^= d.l[1] ^ m.l[0];
-        d.l[1] ^= n.l[0] ^ m.l[1];
-    } else {
-        int i;
-
-        for (i = 0; i < 4; i++) {
-            uint32_t t;
-
-            switch (op) {
-            case 0: /* sha1c */
-                t = cho(CR_ST_WORD(d, 1), CR_ST_WORD(d, 2), CR_ST_WORD(d, 3));
-                break;
-            case 1: /* sha1p */
-                t = par(CR_ST_WORD(d, 1), CR_ST_WORD(d, 2), CR_ST_WORD(d, 3));
-                break;
-            case 2: /* sha1m */
-                t = maj(CR_ST_WORD(d, 1), CR_ST_WORD(d, 2), CR_ST_WORD(d, 3));
-                break;
-            default:
-                g_assert_not_reached();
-            }
-            t += rol32(CR_ST_WORD(d, 0), 5) + CR_ST_WORD(n, 0)
-                 + CR_ST_WORD(m, i);
-
-            CR_ST_WORD(n, 0) = CR_ST_WORD(d, 3);
-            CR_ST_WORD(d, 3) = CR_ST_WORD(d, 2);
-            CR_ST_WORD(d, 2) = ror32(CR_ST_WORD(d, 1), 2);
-            CR_ST_WORD(d, 1) = CR_ST_WORD(d, 0);
-            CR_ST_WORD(d, 0) = t;
-        }
+    for (i = 0; i < 4; i++) {
+        uint32_t t = fn(&d);
+
+        t += rol32(CR_ST_WORD(d, 0), 5) + CR_ST_WORD(n, 0)
+             + CR_ST_WORD(m, i);
+
+        CR_ST_WORD(n, 0) = CR_ST_WORD(d, 3);
+        CR_ST_WORD(d, 3) = CR_ST_WORD(d, 2);
+        CR_ST_WORD(d, 2) = ror32(CR_ST_WORD(d, 1), 2);
+        CR_ST_WORD(d, 1) = CR_ST_WORD(d, 0);
+        CR_ST_WORD(d, 0) = t;
     }
     rd[0] = d.l[0];
     rd[1] = d.l[1];
+
+    clear_tail_16(rd, desc);
+}
+
+static uint32_t do_sha1c(union CRYPTO_STATE *d)
+{
+    return cho(CR_ST_WORD(*d, 1), CR_ST_WORD(*d, 2), CR_ST_WORD(*d, 3));
+}
+
+void HELPER(crypto_sha1c)(void *vd, void *vn, void *vm, uint32_t desc)
+{
+    crypto_sha1_3reg(vd, vn, vm, desc, do_sha1c);
+}
+
+static uint32_t do_sha1p(union CRYPTO_STATE *d)
+{
+    return par(CR_ST_WORD(*d, 1), CR_ST_WORD(*d, 2), CR_ST_WORD(*d, 3));
+}
+
+void HELPER(crypto_sha1p)(void *vd, void *vn, void *vm, uint32_t desc)
+{
+    crypto_sha1_3reg(vd, vn, vm, desc, do_sha1p);
+}
+
+static uint32_t do_sha1m(union CRYPTO_STATE *d)
+{
+    return maj(CR_ST_WORD(*d, 1), CR_ST_WORD(*d, 2), CR_ST_WORD(*d, 3));
+}
+
+void HELPER(crypto_sha1m)(void *vd, void *vn, void *vm, uint32_t desc)
+{
+    crypto_sha1_3reg(vd, vn, vm, desc, do_sha1m);
 }
 
 void HELPER(crypto_sha1h)(void *vd, void *vm, uint32_t desc)
diff --git a/target/arm/helper.h b/target/arm/helper.h
index cee23ad..13475ec 100644
--- a/target/arm/helper.h
+++ b/target/arm/helper.h
@@ -513,7 +513,10 @@ DEF_HELPER_FLAGS_2(neon_qzip32, TCG_CALL_NO_RWG, void, ptr, ptr)
 DEF_HELPER_FLAGS_4(crypto_aese, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, i32)
 DEF_HELPER_FLAGS_3(crypto_aesmc, TCG_CALL_NO_RWG, void, ptr, ptr, i32)
 
-DEF_HELPER_FLAGS_4(crypto_sha1_3reg, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(crypto_sha1su0, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(crypto_sha1c, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(crypto_sha1p, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(crypto_sha1m, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, i32)
 DEF_HELPER_FLAGS_3(crypto_sha1h, TCG_CALL_NO_RWG, void, ptr, ptr, i32)
 DEF_HELPER_FLAGS_3(crypto_sha1su1, TCG_CALL_NO_RWG, void, ptr, ptr, i32)
 
diff --git a/target/arm/neon-dp.decode b/target/arm/neon-dp.decode
index 5b2fc65..8af7c53 100644
--- a/target/arm/neon-dp.decode
+++ b/target/arm/neon-dp.decode
@@ -168,8 +168,10 @@ VQRDMLAH_3s      1111 001 1 0 . .. .... .... 1011 ... 1 .... @3same
 @3same_crypto    .... .... .... .... .... .... .... .... \
                  &3same vm=%vm_dp vn=%vn_dp vd=%vd_dp size=0 q=1
 
-SHA1_3s          1111 001 0 0 . optype:2 .... .... 1100 . 1 . 0 .... \
-                 vm=%vm_dp vn=%vn_dp vd=%vd_dp
+SHA1C_3s         1111 001 0 0 . 00 .... .... 1100 . 1 . 0 .... @3same_crypto
+SHA1P_3s         1111 001 0 0 . 01 .... .... 1100 . 1 . 0 .... @3same_crypto
+SHA1M_3s         1111 001 0 0 . 10 .... .... 1100 . 1 . 0 .... @3same_crypto
+SHA1SU0_3s       1111 001 0 0 . 11 .... .... 1100 . 1 . 0 .... @3same_crypto
 SHA256H_3s       1111 001 1 0 . 00 .... .... 1100 . 1 . 0 .... @3same_crypto
 SHA256H2_3s      1111 001 1 0 . 01 .... .... 1100 . 1 . 0 .... @3same_crypto
 SHA256SU1_3s     1111 001 1 0 . 10 .... .... 1100 . 1 . 0 .... @3same_crypto
diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c
index 5a4f819..3f28888 100644
--- a/target/arm/translate-a64.c
+++ b/target/arm/translate-a64.c
@@ -13475,10 +13475,19 @@ static void disas_crypto_three_reg_sha(DisasContext *s, uint32_t insn)
 
     switch (opcode) {
     case 0: /* SHA1C */
+        genfn = gen_helper_crypto_sha1c;
+        feature = dc_isar_feature(aa64_sha1, s);
+        break;
     case 1: /* SHA1P */
+        genfn = gen_helper_crypto_sha1p;
+        feature = dc_isar_feature(aa64_sha1, s);
+        break;
     case 2: /* SHA1M */
+        genfn = gen_helper_crypto_sha1m;
+        feature = dc_isar_feature(aa64_sha1, s);
+        break;
     case 3: /* SHA1SU0 */
-        genfn = NULL;
+        genfn = gen_helper_crypto_sha1su0;
         feature = dc_isar_feature(aa64_sha1, s);
         break;
     case 4: /* SHA256H */
@@ -13506,23 +13515,7 @@ static void disas_crypto_three_reg_sha(DisasContext *s, uint32_t insn)
     if (!fp_access_check(s)) {
         return;
     }
-
-    if (genfn) {
-        gen_gvec_op3_ool(s, true, rd, rn, rm, 0, genfn);
-    } else {
-        TCGv_i32 tcg_opcode = tcg_const_i32(opcode);
-        TCGv_ptr tcg_rd_ptr = vec_full_reg_ptr(s, rd);
-        TCGv_ptr tcg_rn_ptr = vec_full_reg_ptr(s, rn);
-        TCGv_ptr tcg_rm_ptr = vec_full_reg_ptr(s, rm);
-
-        gen_helper_crypto_sha1_3reg(tcg_rd_ptr, tcg_rn_ptr,
-                                    tcg_rm_ptr, tcg_opcode);
-
-        tcg_temp_free_i32(tcg_opcode);
-        tcg_temp_free_ptr(tcg_rd_ptr);
-        tcg_temp_free_ptr(tcg_rn_ptr);
-        tcg_temp_free_ptr(tcg_rm_ptr);
-    }
+    gen_gvec_op3_ool(s, true, rd, rn, rm, 0, genfn);
 }
 
 /* Crypto two-reg SHA
diff --git a/target/arm/translate-neon.inc.c b/target/arm/translate-neon.inc.c
index 205877c..7b19753 100644
--- a/target/arm/translate-neon.inc.c
+++ b/target/arm/translate-neon.inc.c
@@ -693,42 +693,20 @@ static bool trans_VMUL_p_3s(DisasContext *s, arg_3same *a)
 DO_VQRDMLAH(VQRDMLAH, gen_gvec_sqrdmlah_qc)
 DO_VQRDMLAH(VQRDMLSH, gen_gvec_sqrdmlsh_qc)
 
-static bool trans_SHA1_3s(DisasContext *s, arg_SHA1_3s *a)
-{
-    TCGv_ptr ptr1, ptr2, ptr3;
-    TCGv_i32 tmp;
-
-    if (!arm_dc_feature(s, ARM_FEATURE_NEON) ||
-        !dc_isar_feature(aa32_sha1, s)) {
-        return false;
-    }
-
-    /* UNDEF accesses to D16-D31 if they don't exist. */
-    if (!dc_isar_feature(aa32_simd_r32, s) &&
-        ((a->vd | a->vn | a->vm) & 0x10)) {
-        return false;
-    }
-
-    if ((a->vn | a->vm | a->vd) & 1) {
-        return false;
-    }
-
-    if (!vfp_access_check(s)) {
-        return true;
+#define DO_SHA1(NAME, FUNC)                                             \
+    WRAP_OOL_FN(gen_##NAME##_3s, FUNC)                                  \
+    static bool trans_##NAME##_3s(DisasContext *s, arg_3same *a)        \
+    {                                                                   \
+        if (!dc_isar_feature(aa32_sha1, s)) {                           \
+            return false;                                               \
+        }                                                               \
+        return do_3same(s, a, gen_##NAME##_3s);                         \
     }
 
-    ptr1 = vfp_reg_ptr(true, a->vd);
-    ptr2 = vfp_reg_ptr(true, a->vn);
-    ptr3 = vfp_reg_ptr(true, a->vm);
-    tmp = tcg_const_i32(a->optype);
-    gen_helper_crypto_sha1_3reg(ptr1, ptr2, ptr3, tmp);
-    tcg_temp_free_i32(tmp);
-    tcg_temp_free_ptr(ptr1);
-    tcg_temp_free_ptr(ptr2);
-    tcg_temp_free_ptr(ptr3);
-
-    return true;
-}
+DO_SHA1(SHA1C, gen_helper_crypto_sha1c)
+DO_SHA1(SHA1P, gen_helper_crypto_sha1p)
+DO_SHA1(SHA1M, gen_helper_crypto_sha1m)
+DO_SHA1(SHA1SU0, gen_helper_crypto_sha1su0)
 
 #define DO_SHA2(NAME, FUNC)                                             \
     WRAP_OOL_FN(gen_##NAME##_3s, FUNC)                                  \