tcg/loongarch64: Implement simple load/store ops

Signed-off-by: WANG Xuerui <git@xen0n.name>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20211221054105.178795-23-git@xen0n.name>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

2 files changed, 132 insertions, 0 deletions

diff --git a/tcg/loongarch64/tcg-target-con-set.h b/tcg/loongarch64/tcg-target-con-set.h
index a2ec61237e..e54ca9b2de 100644
--- a/tcg/loongarch64/tcg-target-con-set.h
+++ b/tcg/loongarch64/tcg-target-con-set.h
@@ -15,6 +15,7 @@
  * tcg-target-con-str.h; the constraint combination is inclusive or.
  */
 C_O0_I1(r)
+C_O0_I2(rZ, r)
 C_O0_I2(rZ, rZ)
 C_O1_I1(r, r)
 C_O1_I2(r, r, rC)
diff --git a/tcg/loongarch64/tcg-target.c.inc b/tcg/loongarch64/tcg-target.c.inc
index 151d3308ea..3d1d7c33c0 100644
--- a/tcg/loongarch64/tcg-target.c.inc
+++ b/tcg/loongarch64/tcg-target.c.inc
@@ -566,6 +566,73 @@ static void tcg_out_call(TCGContext *s, const tcg_insn_unit *arg)
 }
 
 /*
+ * Load/store helpers
+ */
+
+static void tcg_out_ldst(TCGContext *s, LoongArchInsn opc, TCGReg data,
+                         TCGReg addr, intptr_t offset)
+{
+    intptr_t imm12 = sextreg(offset, 0, 12);
+
+    if (offset != imm12) {
+        intptr_t diff = offset - (uintptr_t)s->code_ptr;
+
+        if (addr == TCG_REG_ZERO && diff == (int32_t)diff) {
+            imm12 = sextreg(diff, 0, 12);
+            tcg_out_opc_pcaddu12i(s, TCG_REG_TMP2, (diff - imm12) >> 12);
+        } else {
+            tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_TMP2, offset - imm12);
+            if (addr != TCG_REG_ZERO) {
+                tcg_out_opc_add_d(s, TCG_REG_TMP2, TCG_REG_TMP2, addr);
+            }
+        }
+        addr = TCG_REG_TMP2;
+    }
+
+    switch (opc) {
+    case OPC_LD_B:
+    case OPC_LD_BU:
+    case OPC_LD_H:
+    case OPC_LD_HU:
+    case OPC_LD_W:
+    case OPC_LD_WU:
+    case OPC_LD_D:
+    case OPC_ST_B:
+    case OPC_ST_H:
+    case OPC_ST_W:
+    case OPC_ST_D:
+        tcg_out32(s, encode_djsk12_insn(opc, data, addr, imm12));
+        break;
+    default:
+        g_assert_not_reached();
+    }
+}
+
+static void tcg_out_ld(TCGContext *s, TCGType type, TCGReg arg,
+                       TCGReg arg1, intptr_t arg2)
+{
+    bool is_32bit = type == TCG_TYPE_I32;
+    tcg_out_ldst(s, is_32bit ? OPC_LD_W : OPC_LD_D, arg, arg1, arg2);
+}
+
+static void tcg_out_st(TCGContext *s, TCGType type, TCGReg arg,
+                       TCGReg arg1, intptr_t arg2)
+{
+    bool is_32bit = type == TCG_TYPE_I32;
+    tcg_out_ldst(s, is_32bit ? OPC_ST_W : OPC_ST_D, arg, arg1, arg2);
+}
+
+static bool tcg_out_sti(TCGContext *s, TCGType type, TCGArg val,
+                        TCGReg base, intptr_t ofs)
+{
+    if (val == 0) {
+        tcg_out_st(s, type, TCG_REG_ZERO, base, ofs);
+        return true;
+    }
+    return false;
+}
+
+/*
  * Entry-points
  */
 
@@ -913,6 +980,49 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc,
         tcg_out_setcond(s, args[3], a0, a1, a2, c2);
         break;
 
+    case INDEX_op_ld8s_i32:
+    case INDEX_op_ld8s_i64:
+        tcg_out_ldst(s, OPC_LD_B, a0, a1, a2);
+        break;
+    case INDEX_op_ld8u_i32:
+    case INDEX_op_ld8u_i64:
+        tcg_out_ldst(s, OPC_LD_BU, a0, a1, a2);
+        break;
+    case INDEX_op_ld16s_i32:
+    case INDEX_op_ld16s_i64:
+        tcg_out_ldst(s, OPC_LD_H, a0, a1, a2);
+        break;
+    case INDEX_op_ld16u_i32:
+    case INDEX_op_ld16u_i64:
+        tcg_out_ldst(s, OPC_LD_HU, a0, a1, a2);
+        break;
+    case INDEX_op_ld_i32:
+    case INDEX_op_ld32s_i64:
+        tcg_out_ldst(s, OPC_LD_W, a0, a1, a2);
+        break;
+    case INDEX_op_ld32u_i64:
+        tcg_out_ldst(s, OPC_LD_WU, a0, a1, a2);
+        break;
+    case INDEX_op_ld_i64:
+        tcg_out_ldst(s, OPC_LD_D, a0, a1, a2);
+        break;
+
+    case INDEX_op_st8_i32:
+    case INDEX_op_st8_i64:
+        tcg_out_ldst(s, OPC_ST_B, a0, a1, a2);
+        break;
+    case INDEX_op_st16_i32:
+    case INDEX_op_st16_i64:
+        tcg_out_ldst(s, OPC_ST_H, a0, a1, a2);
+        break;
+    case INDEX_op_st_i32:
+    case INDEX_op_st32_i64:
+        tcg_out_ldst(s, OPC_ST_W, a0, a1, a2);
+        break;
+    case INDEX_op_st_i64:
+        tcg_out_ldst(s, OPC_ST_D, a0, a1, a2);
+        break;
+
     case INDEX_op_mov_i32:  /* Always emitted via tcg_out_mov.  */
     case INDEX_op_mov_i64:
     case INDEX_op_call:     /* Always emitted via tcg_out_call.  */
@@ -927,6 +1037,15 @@ static TCGConstraintSetIndex tcg_target_op_def(TCGOpcode op)
     case INDEX_op_goto_ptr:
         return C_O0_I1(r);
 
+    case INDEX_op_st8_i32:
+    case INDEX_op_st8_i64:
+    case INDEX_op_st16_i32:
+    case INDEX_op_st16_i64:
+    case INDEX_op_st32_i64:
+    case INDEX_op_st_i32:
+    case INDEX_op_st_i64:
+        return C_O0_I2(rZ, r);
+
     case INDEX_op_brcond_i32:
     case INDEX_op_brcond_i64:
         return C_O0_I2(rZ, rZ);
@@ -954,6 +1073,18 @@ static TCGConstraintSetIndex tcg_target_op_def(TCGOpcode op)
     case INDEX_op_bswap32_i32:
     case INDEX_op_bswap32_i64:
     case INDEX_op_bswap64_i64:
+    case INDEX_op_ld8s_i32:
+    case INDEX_op_ld8s_i64:
+    case INDEX_op_ld8u_i32:
+    case INDEX_op_ld8u_i64:
+    case INDEX_op_ld16s_i32:
+    case INDEX_op_ld16s_i64:
+    case INDEX_op_ld16u_i32:
+    case INDEX_op_ld16u_i64:
+    case INDEX_op_ld32s_i64:
+    case INDEX_op_ld32u_i64:
+    case INDEX_op_ld_i32:
+    case INDEX_op_ld_i64:
         return C_O1_I1(r, r);
 
     case INDEX_op_andc_i32: