[PATCH 4/5] rs6000: Introducing rs6000_abi_word_mode

[Segher Boessenkool <segher@kernel.crashing.org>]

Some hooks return word_mode by default, which is incorrect for -m32
-mpowerpc64.  This patch creates a new function rs6000_abi_word_mode
to implement these hooks, and does so.

This fixes 163 testuite FAILs.

[ David already OKed this fixed version, but sending it again is easier
  for me.  Lazy, etc. ]


2015-01-14  Segher Boessenkool  <segher@kernel.crashing.org>

gcc/
	* config/rs6000/rs6000.c (TARGET_LIBGCC_CMP_RETURN_MODE,
	TARGET_LIBGCC_SHIFT_COUNT_MODE, TARGET_UNWIND_WORD_MODE): Implement
	as ...
	(rs6000_abi_word_mode): New function.

---
 gcc/config/rs6000/rs6000.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index afced72..6c91f3c 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -1669,6 +1669,13 @@ static const struct attribute_spec rs6000_attribute_table[] =
 
 #undef TARGET_ATOMIC_ASSIGN_EXPAND_FENV
 #define TARGET_ATOMIC_ASSIGN_EXPAND_FENV rs6000_atomic_assign_expand_fenv
+
+#undef TARGET_LIBGCC_CMP_RETURN_MODE
+#define TARGET_LIBGCC_CMP_RETURN_MODE rs6000_abi_word_mode
+#undef TARGET_LIBGCC_SHIFT_COUNT_MODE
+#define TARGET_LIBGCC_SHIFT_COUNT_MODE rs6000_abi_word_mode
+#undef TARGET_UNWIND_WORD_MODE
+#define TARGET_UNWIND_WORD_MODE rs6000_abi_word_mode
 \f
 
 /* Processor table.  */
@@ -9299,6 +9306,15 @@ init_cumulative_args (CUMULATIVE_ARGS *cum, tree fntype,
     }
 }
 \f
+/* The mode the ABI uses for a word.  This is not the same as word_mode
+   for -m32 -mpowerpc64.  This is used to implement various target hooks.  */
+
+static machine_mode
+rs6000_abi_word_mode (void)
+{
+  return TARGET_32BIT ? SImode : DImode;
+}
+
 /* On rs6000, function arguments are promoted, as are function return
    values.  */
 
-- 
1.8.1.4