tcg: Add tcg_get_insn_start_param

MicroBlaze will shortly need to update a parameter in place.
Add an interface to read to match that for write.

Tested-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

diff --git a/include/tcg/tcg.h b/include/tcg/tcg.h
index d40c925..53ce94c 100644 (file)
--- a/include/tcg/tcg.h
+++ b/include/tcg/tcg.h
@@ -777,11 +777,26 @@ static inline TCGv_i32 TCGV_HIGH(TCGv_i64 t)
 }
 #endif
 
+static inline TCGArg tcg_get_insn_param(TCGOp *op, int arg)
+{
+    return op->args[arg];
+}
+
 static inline void tcg_set_insn_param(TCGOp *op, int arg, TCGArg v)
 {
     op->args[arg] = v;
 }
 
+static inline target_ulong tcg_get_insn_start_param(TCGOp *op, int arg)
+{
+#if TARGET_LONG_BITS <= TCG_TARGET_REG_BITS
+    return tcg_get_insn_param(op, arg);
+#else
+    return tcg_get_insn_param(op, arg * 2) |
+           ((uint64_t)tcg_get_insn_param(op, arg * 2 + 1) << 32);
+#endif
+}
+
 static inline void tcg_set_insn_start_param(TCGOp *op, int arg, target_ulong v)
 {
 #if TARGET_LONG_BITS <= TCG_TARGET_REG_BITS