target/sparc: Move BPcc and Bicc to decodetree

Tested-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Acked-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
qemu · Oct 25, 2023 · 276567a · 276567a
1 parent 23ada1b
commit 276567a
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Showing 2 changed files with 61 additions and 60 deletions.
diff --git a/target/sparc/insns.decode b/target/sparc/insns.decode
@@ -3,4 +3,8 @@
 # Sparc instruction decode definitions.
 # Copyright (c) 2023 Richard Henderson <rth@twiddle.net>
 
+&bcc    i a cond cc
+BPcc    00 a:1 cond:4   001 cc:1 0 - i:s19                 &bcc
+Bicc    00 a:1 cond:4   010          i:s22                 &bcc cc=0
+
 CALL    01 i:s30
diff --git a/target/sparc/translate.c b/target/sparc/translate.c
@@ -1367,44 +1367,6 @@ static void gen_cond_reg(TCGv r_dst, int cond, TCGv r_src)
 }
 #endif
 
-static void do_branch(DisasContext *dc, int32_t offset, uint32_t insn, int cc)
-{
-    unsigned int cond = GET_FIELD(insn, 3, 6), a = (insn & (1 << 29));
-    target_ulong target = dc->pc + offset;
-
-    if (unlikely(AM_CHECK(dc))) {
-        target &= 0xffffffffULL;
-    }
-    if (cond == 0x0) {
-        /* unconditional not taken */
-        if (a) {
-            dc->pc = dc->npc + 4;
-            dc->npc = dc->pc + 4;
-        } else {
-            dc->pc = dc->npc;
-            dc->npc = dc->pc + 4;
-        }
-    } else if (cond == 0x8) {
-        /* unconditional taken */
-        if (a) {
-            dc->pc = target;
-            dc->npc = dc->pc + 4;
-        } else {
-            dc->pc = dc->npc;
-            dc->npc = target;
-            tcg_gen_mov_tl(cpu_pc, cpu_npc);
-        }
-    } else {
-        flush_cond(dc);
-        gen_cond(cpu_cond, cc, cond, dc);
-        if (a) {
-            gen_branch_a(dc, target);
-        } else {
-            gen_branch_n(dc, target);
-        }
-    }
-}
-
 static void do_fbranch(DisasContext *dc, int32_t offset, uint32_t insn, int cc)
 {
     unsigned int cond = GET_FIELD(insn, 3, 6), a = (insn & (1 << 29));
@@ -3046,6 +3008,61 @@ static bool advance_pc(DisasContext *dc)
     return true;
 }
 
+static bool advance_jump_uncond_never(DisasContext *dc, bool annul)
+{
+    if (annul) {
+        dc->pc = dc->npc + 4;
+        dc->npc = dc->pc + 4;
+    } else {
+        dc->pc = dc->npc;
+        dc->npc = dc->pc + 4;
+    }
+    return true;
+}
+
+static bool advance_jump_uncond_always(DisasContext *dc, bool annul,
+                                       target_ulong dest)
+{
+    if (annul) {
+        dc->pc = dest;
+        dc->npc = dest + 4;
+    } else {
+        dc->pc = dc->npc;
+        dc->npc = dest;
+        tcg_gen_mov_tl(cpu_pc, cpu_npc);
+    }
+    return true;
+}
+
+static bool advance_jump_cond(DisasContext *dc, bool annul, target_ulong dest)
+{
+    if (annul) {
+        gen_branch_a(dc, dest);
+    } else {
+        gen_branch_n(dc, dest);
+    }
+    return true;
+}
+
+static bool do_bpcc(DisasContext *dc, arg_bcc *a)
+{
+    target_long target = address_mask_i(dc, dc->pc + a->i * 4);
+
+    switch (a->cond) {
+    case 0x0:
+        return advance_jump_uncond_never(dc, a->a);
+    case 0x8:
+        return advance_jump_uncond_always(dc, a->a, target);
+    default:
+        flush_cond(dc);
+        gen_cond(cpu_cond, a->cc, a->cond, dc);
+        return advance_jump_cond(dc, a->a, target);
+    }
+}
+
+TRANS(Bicc, ALL, do_bpcc, a)
+TRANS(BPcc,  64, do_bpcc, a)
+
 static bool trans_CALL(DisasContext *dc, arg_CALL *a)
 {
     target_long target = address_mask_i(dc, dc->pc + a->i * 4);
@@ -3083,21 +3100,7 @@ static void disas_sparc_legacy(DisasContext *dc, unsigned int insn)
             switch (xop) {
 #ifdef TARGET_SPARC64
             case 0x1:           /* V9 BPcc */
-                {
-                    int cc;
-
-                    target = GET_FIELD_SP(insn, 0, 18);
-                    target = sign_extend(target, 19);
-                    target <<= 2;
-                    cc = GET_FIELD_SP(insn, 20, 21);
-                    if (cc == 0)
-                        do_branch(dc, target, insn, 0);
-                    else if (cc == 2)
-                        do_branch(dc, target, insn, 1);
-                    else
-                        goto illegal_insn;
-                    goto jmp_insn;
-                }
+                g_assert_not_reached(); /* in decodetree */
             case 0x3:           /* V9 BPr */
                 {
                     target = GET_FIELD_SP(insn, 0, 13) |
@@ -3127,13 +3130,7 @@ static void disas_sparc_legacy(DisasContext *dc, unsigned int insn)
                 }
 #endif
             case 0x2:           /* BN+x */
-                {
-                    target = GET_FIELD(insn, 10, 31);
-                    target = sign_extend(target, 22);
-                    target <<= 2;
-                    do_branch(dc, target, insn, 0);
-                    goto jmp_insn;
-                }
+                g_assert_not_reached(); /* in decodetree */
             case 0x6:           /* FBN+x */
                 {
                     if (gen_trap_ifnofpu(dc)) {