[Qemu-devel] [PATCH v5 2/8] target/mips: Support R5900 specific three-operand MULT and MULTU

[Fredrik Noring]

Signed-off-by: Fredrik Noring <nor...@nocrew.org>
---
 target/mips/translate.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/target/mips/translate.c b/target/mips/translate.c
index ab16cdb911..fb571e278e 100644
--- a/target/mips/translate.c
+++ b/target/mips/translate.c
@@ -3768,6 +3768,57 @@ static void gen_muldiv(DisasContext *ctx, uint32_t opc,
     tcg_temp_free(t1);
 }
 
+static void gen_mul_r5900(DisasContext *ctx, uint32_t opc,
+                          int acc, int rd, int rs, int rt)
+{
+    TCGv t0 = tcg_temp_new();
+    TCGv t1 = tcg_temp_new();
+
+    gen_load_gpr(t0, rs);
+    gen_load_gpr(t1, rt);
+
+    switch (opc) {
+    case OPC_MULT:
+        {
+            TCGv_i32 t2 = tcg_temp_new_i32();
+            TCGv_i32 t3 = tcg_temp_new_i32();
+            tcg_gen_trunc_tl_i32(t2, t0);
+            tcg_gen_trunc_tl_i32(t3, t1);
+            tcg_gen_muls2_i32(t2, t3, t2, t3);
+            if (rd)
+                tcg_gen_ext_i32_tl(cpu_gpr[rd], t2);
+            tcg_gen_ext_i32_tl(cpu_LO[acc], t2);
+            tcg_gen_ext_i32_tl(cpu_HI[acc], t3);
+            tcg_temp_free_i32(t2);
+            tcg_temp_free_i32(t3);
+        }
+        break;
+    case OPC_MULTU:
+        {
+            TCGv_i32 t2 = tcg_temp_new_i32();
+            TCGv_i32 t3 = tcg_temp_new_i32();
+            tcg_gen_trunc_tl_i32(t2, t0);
+            tcg_gen_trunc_tl_i32(t3, t1);
+            tcg_gen_mulu2_i32(t2, t3, t2, t3);
+            if (rd)
+                tcg_gen_ext_i32_tl(cpu_gpr[rd], t2);
+            tcg_gen_ext_i32_tl(cpu_LO[acc], t2);
+            tcg_gen_ext_i32_tl(cpu_HI[acc], t3);
+            tcg_temp_free_i32(t2);
+            tcg_temp_free_i32(t3);
+        }
+        break;
+    default:
+        MIPS_INVAL("mul R5900");
+        generate_exception_end(ctx, EXCP_RI);
+        goto out;
+    }
+
+ out:
+    tcg_temp_free(t0);
+    tcg_temp_free(t1);
+}
+
 static void gen_mul_vr54xx (DisasContext *ctx, uint32_t opc,
                             int rd, int rs, int rt)
 {
@@ -22378,6 +22429,8 @@ static void decode_opc_special_legacy(CPUMIPSState 
*env, DisasContext *ctx)
             check_insn(ctx, INSN_VR54XX);
             op1 = MASK_MUL_VR54XX(ctx->opcode);
             gen_mul_vr54xx(ctx, op1, rd, rs, rt);
+        } else if (ctx->insn_flags & INSN_R5900) {
+            gen_mul_r5900(ctx, op1, 0, rd, rs, rt);
         } else {
             gen_muldiv(ctx, op1, rd & 3, rs, rt);
         }
-- 
2.16.4