target/arm: Convert NEON VFMA, VFMS 3-reg-same insns to decodetree

Convert the Neon floating point VFMA and VFMS insn to decodetree.
These are the last insns in the 3-reg-same group so we can
remove all the support/loop code from the old decoder.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20200512163904.10918-18-peter.maydell@linaro.org

3 files changed, 46 insertions, 174 deletions

diff --git a/target/arm/neon-dp.decode b/target/arm/neon-dp.decode
index 9c28886..8beb1db 100644
--- a/target/arm/neon-dp.decode
+++ b/target/arm/neon-dp.decode
@@ -174,6 +174,9 @@ SHA256H2_3s      1111 001 1 0 . 01 .... .... 1100 . 1 . 0 .... \
 SHA256SU1_3s     1111 001 1 0 . 10 .... .... 1100 . 1 . 0 .... \
                  vm=%vm_dp vn=%vn_dp vd=%vd_dp
 
+VFMA_fp_3s       1111 001 0 0 . 0 . .... .... 1100 ... 1 .... @3same_fp
+VFMS_fp_3s       1111 001 0 0 . 1 . .... .... 1100 ... 1 .... @3same_fp
+
 VQRDMLSH_3s      1111 001 1 0 . .. .... .... 1100 ... 1 .... @3same
 
 VADD_fp_3s       1111 001 0 0 . 0 . .... .... 1101 ... 0 .... @3same_fp
diff --git a/target/arm/translate-neon.inc.c b/target/arm/translate-neon.inc.c
index 5e9e53c..3fe65a0 100644
--- a/target/arm/translate-neon.inc.c
+++ b/target/arm/translate-neon.inc.c
@@ -1207,6 +1207,47 @@ static bool trans_VRSQRTS_fp_3s(DisasContext *s, arg_3same *a)
     return do_3same(s, a, gen_VRSQRTS_fp_3s);
 }
 
+static void gen_VFMA_fp_3s(TCGv_i32 vd, TCGv_i32 vn, TCGv_i32 vm,
+                            TCGv_ptr fpstatus)
+{
+    gen_helper_vfp_muladds(vd, vn, vm, vd, fpstatus);
+}
+
+static bool trans_VFMA_fp_3s(DisasContext *s, arg_3same *a)
+{
+    if (!dc_isar_feature(aa32_simdfmac, s)) {
+        return false;
+    }
+
+    if (a->size != 0) {
+        /* TODO fp16 support */
+        return false;
+    }
+
+    return do_3same_fp(s, a, gen_VFMA_fp_3s, true);
+}
+
+static void gen_VFMS_fp_3s(TCGv_i32 vd, TCGv_i32 vn, TCGv_i32 vm,
+                            TCGv_ptr fpstatus)
+{
+    gen_helper_vfp_negs(vn, vn);
+    gen_helper_vfp_muladds(vd, vn, vm, vd, fpstatus);
+}
+
+static bool trans_VFMS_fp_3s(DisasContext *s, arg_3same *a)
+{
+    if (!dc_isar_feature(aa32_simdfmac, s)) {
+        return false;
+    }
+
+    if (a->size != 0) {
+        /* TODO fp16 support */
+        return false;
+    }
+
+    return do_3same_fp(s, a, gen_VFMS_fp_3s, true);
+}
+
 static bool do_3same_fp_pair(DisasContext *s, arg_3same *a, VFPGen3OpSPFn *fn)
 {
     /* FP operations handled pairwise 32 bits at a time */
diff --git a/target/arm/translate.c b/target/arm/translate.c
index c1d4fab..4c9bb8b 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -3391,78 +3391,6 @@ static void gen_neon_narrow_op(int op, int u, int size,
     }
 }
 
-/* Symbolic constants for op fields for Neon 3-register same-length.
- * The values correspond to bits [11:8,4]; see the ARM ARM DDI0406B
- * table A7-9.
- */
-#define NEON_3R_VHADD 0
-#define NEON_3R_VQADD 1
-#define NEON_3R_VRHADD 2
-#define NEON_3R_LOGIC 3 /* VAND,VBIC,VORR,VMOV,VORN,VEOR,VBIF,VBIT,VBSL */
-#define NEON_3R_VHSUB 4
-#define NEON_3R_VQSUB 5
-#define NEON_3R_VCGT 6
-#define NEON_3R_VCGE 7
-#define NEON_3R_VSHL 8
-#define NEON_3R_VQSHL 9
-#define NEON_3R_VRSHL 10
-#define NEON_3R_VQRSHL 11
-#define NEON_3R_VMAX 12
-#define NEON_3R_VMIN 13
-#define NEON_3R_VABD 14
-#define NEON_3R_VABA 15
-#define NEON_3R_VADD_VSUB 16
-#define NEON_3R_VTST_VCEQ 17
-#define NEON_3R_VML 18 /* VMLA, VMLS */
-#define NEON_3R_VMUL 19
-#define NEON_3R_VPMAX 20
-#define NEON_3R_VPMIN 21
-#define NEON_3R_VQDMULH_VQRDMULH 22
-#define NEON_3R_VPADD_VQRDMLAH 23
-#define NEON_3R_SHA 24 /* SHA1C,SHA1P,SHA1M,SHA1SU0,SHA256H{2},SHA256SU1 */
-#define NEON_3R_VFM_VQRDMLSH 25 /* VFMA, VFMS, VQRDMLSH */
-#define NEON_3R_FLOAT_ARITH 26 /* float VADD, VSUB, VPADD, VABD */
-#define NEON_3R_FLOAT_MULTIPLY 27 /* float VMLA, VMLS, VMUL */
-#define NEON_3R_FLOAT_CMP 28 /* float VCEQ, VCGE, VCGT */
-#define NEON_3R_FLOAT_ACMP 29 /* float VACGE, VACGT, VACLE, VACLT */
-#define NEON_3R_FLOAT_MINMAX 30 /* float VMIN, VMAX */
-#define NEON_3R_FLOAT_MISC 31 /* float VRECPS, VRSQRTS, VMAXNM/MINNM */
-
-static const uint8_t neon_3r_sizes[] = {
-    [NEON_3R_VHADD] = 0x7,
-    [NEON_3R_VQADD] = 0xf,
-    [NEON_3R_VRHADD] = 0x7,
-    [NEON_3R_LOGIC] = 0xf, /* size field encodes op type */
-    [NEON_3R_VHSUB] = 0x7,
-    [NEON_3R_VQSUB] = 0xf,
-    [NEON_3R_VCGT] = 0x7,
-    [NEON_3R_VCGE] = 0x7,
-    [NEON_3R_VSHL] = 0xf,
-    [NEON_3R_VQSHL] = 0xf,
-    [NEON_3R_VRSHL] = 0xf,
-    [NEON_3R_VQRSHL] = 0xf,
-    [NEON_3R_VMAX] = 0x7,
-    [NEON_3R_VMIN] = 0x7,
-    [NEON_3R_VABD] = 0x7,
-    [NEON_3R_VABA] = 0x7,
-    [NEON_3R_VADD_VSUB] = 0xf,
-    [NEON_3R_VTST_VCEQ] = 0x7,
-    [NEON_3R_VML] = 0x7,
-    [NEON_3R_VMUL] = 0x7,
-    [NEON_3R_VPMAX] = 0x7,
-    [NEON_3R_VPMIN] = 0x7,
-    [NEON_3R_VQDMULH_VQRDMULH] = 0x6,
-    [NEON_3R_VPADD_VQRDMLAH] = 0x7,
-    [NEON_3R_SHA] = 0xf, /* size field encodes op type */
-    [NEON_3R_VFM_VQRDMLSH] = 0x7, /* For VFM, size bit 1 encodes op */
-    [NEON_3R_FLOAT_ARITH] = 0x5, /* size bit 1 encodes op */
-    [NEON_3R_FLOAT_MULTIPLY] = 0x5, /* size bit 1 encodes op */
-    [NEON_3R_FLOAT_CMP] = 0x5, /* size bit 1 encodes op */
-    [NEON_3R_FLOAT_ACMP] = 0x5, /* size bit 1 encodes op */
-    [NEON_3R_FLOAT_MINMAX] = 0x5, /* size bit 1 encodes op */
-    [NEON_3R_FLOAT_MISC] = 0x5, /* size bit 1 encodes op */
-};
-
 /* Symbolic constants for op fields for Neon 2-register miscellaneous.
  * The values correspond to bits [17:16,10:7]; see the ARM ARM DDI0406B
  * table A7-13.
@@ -5383,108 +5311,8 @@ static int disas_neon_data_insn(DisasContext *s, uint32_t insn)
     rm_ofs = neon_reg_offset(rm, 0);
 
     if ((insn & (1 << 23)) == 0) {
-        /* Three register same length.  */
-        op = ((insn >> 7) & 0x1e) | ((insn >> 4) & 1);
-        /* Catch invalid op and bad size combinations: UNDEF */
-        if ((neon_3r_sizes[op] & (1 << size)) == 0) {
-            return 1;
-        }
-        /* All insns of this form UNDEF for either this condition or the
-         * superset of cases "Q==1"; we catch the latter later.
-         */
-        if (q && ((rd | rn | rm) & 1)) {
-            return 1;
-        }
-        switch (op) {
-        case NEON_3R_VFM_VQRDMLSH:
-            if (!u) {
-                /* VFM, VFMS */
-                if (size == 1) {
-                    return 1;
-                }
-                break;
-            }
-            /* VQRDMLSH : handled by decodetree */
-            return 1;
-
-        case NEON_3R_VADD_VSUB:
-        case NEON_3R_LOGIC:
-        case NEON_3R_VMAX:
-        case NEON_3R_VMIN:
-        case NEON_3R_VTST_VCEQ:
-        case NEON_3R_VCGT:
-        case NEON_3R_VCGE:
-        case NEON_3R_VQADD:
-        case NEON_3R_VQSUB:
-        case NEON_3R_VMUL:
-        case NEON_3R_VML:
-        case NEON_3R_VSHL:
-        case NEON_3R_SHA:
-        case NEON_3R_VHADD:
-        case NEON_3R_VRHADD:
-        case NEON_3R_VHSUB:
-        case NEON_3R_VABD:
-        case NEON_3R_VABA:
-        case NEON_3R_VQSHL:
-        case NEON_3R_VRSHL:
-        case NEON_3R_VQRSHL:
-        case NEON_3R_VPMAX:
-        case NEON_3R_VPMIN:
-        case NEON_3R_VPADD_VQRDMLAH:
-        case NEON_3R_VQDMULH_VQRDMULH:
-        case NEON_3R_FLOAT_ARITH:
-        case NEON_3R_FLOAT_MULTIPLY:
-        case NEON_3R_FLOAT_CMP:
-        case NEON_3R_FLOAT_ACMP:
-        case NEON_3R_FLOAT_MINMAX:
-        case NEON_3R_FLOAT_MISC:
-            /* Already handled by decodetree */
-            return 1;
-        }
-
-        if (size == 3) {
-            /* 64-bit element instructions: handled by decodetree */
-            return 1;
-        }
-        switch (op) {
-        case NEON_3R_VFM_VQRDMLSH:
-            if (!dc_isar_feature(aa32_simdfmac, s)) {
-                return 1;
-            }
-            break;
-        default:
-            break;
-        }
-
-        for (pass = 0; pass < (q ? 4 : 2); pass++) {
-
-        /* Elementwise.  */
-        tmp = neon_load_reg(rn, pass);
-        tmp2 = neon_load_reg(rm, pass);
-        switch (op) {
-        case NEON_3R_VFM_VQRDMLSH:
-        {
-            /* VFMA, VFMS: fused multiply-add */
-            TCGv_ptr fpstatus = get_fpstatus_ptr(1);
-            TCGv_i32 tmp3 = neon_load_reg(rd, pass);
-            if (size) {
-                /* VFMS */
-                gen_helper_vfp_negs(tmp, tmp);
-            }
-            gen_helper_vfp_muladds(tmp, tmp, tmp2, tmp3, fpstatus);
-            tcg_temp_free_i32(tmp3);
-            tcg_temp_free_ptr(fpstatus);
-            break;
-        }
-        default:
-            abort();
-        }
-        tcg_temp_free_i32(tmp2);
-
-        neon_store_reg(rd, pass, tmp);
-
-        } /* for pass */
-        /* End of 3 register same size operations.  */
+        /* Three register same length: handled by decodetree */
+        return 1;
     } else if (insn & (1 << 4)) {
         if ((insn & 0x00380080) != 0) {
             /* Two registers and shift.  */