[NDS32] No need to take padding into consideration in Andes ABI2 because

        we can pass arguments in registers for variadic function.

  -- By default GCC uses must_pass_in_stack_var_size_or_pad for TARGET_MUST_PASS_IN_STACK.
     For Andes ABI2, the data layout in memory will be incorrect when calling variadic function
     under big-endian configuration.

	* config/nds32/nds32.c (nds32_must_pass_in_stack): New implementation
	for TARGET_MUST_PASS_IN_STACK.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@214869 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 16 insertions, 0 deletions

diff --git a/gcc/config/nds32/nds32.c b/gcc/config/nds32/nds32.c
index fdd4fd4151b..062e803e4a5 100644
--- a/gcc/config/nds32/nds32.c
+++ b/gcc/config/nds32/nds32.c
@@ -1352,6 +1352,19 @@ nds32_function_arg (cumulative_args_t ca, enum machine_mode mode,
   return NULL_RTX;
 }
 
+static bool
+nds32_must_pass_in_stack (enum machine_mode mode, const_tree type)
+{
+  /* Return true if a type must be passed in memory.
+     If it is NOT using hard float abi, small aggregates can be
+     passed in a register even we are calling a variadic function.
+     So there is no need to take padding into consideration.  */
+  if (TARGET_HARD_FLOAT)
+    return must_pass_in_stack_var_size_or_pad (mode, type);
+  else
+    return must_pass_in_stack_var_size (mode, type);
+}
+
 static int
 nds32_arg_partial_bytes (cumulative_args_t ca, enum machine_mode mode,
 			 tree type, bool named ATTRIBUTE_UNUSED)
@@ -3498,6 +3511,9 @@ nds32_target_alignment (rtx label)
 #undef TARGET_FUNCTION_ARG
 #define TARGET_FUNCTION_ARG nds32_function_arg
 
+#undef TARGET_MUST_PASS_IN_STACK
+#define TARGET_MUST_PASS_IN_STACK nds32_must_pass_in_stack
+
 #undef TARGET_ARG_PARTIAL_BYTES
 #define TARGET_ARG_PARTIAL_BYTES nds32_arg_partial_bytes