[PATCH 39/52] i386: New hook implementation ix86_c_mode_for_floating_type

[Kewen Lin]

This is to remove macros {FLOAT,{,LONG_}DOUBLE}_TYPE_SIZE
defines in i386 port, and add new port specific hook
implementation ix86_c_mode_for_floating_type.

gcc/ChangeLog:

        * config/i386/i386.cc (ix86_c_mode_for_floating_type): New
        function.
        (TARGET_C_MODE_FOR_FLOATING_TYPE): New macro.
        * config/i386/i386.h (FLOAT_TYPE_SIZE): Remove.
        (DOUBLE_TYPE_SIZE): Likewise.
        (LONG_DOUBLE_TYPE_SIZE): Likewise.
---
 gcc/config/i386/i386.cc | 15 +++++++++++++++
 gcc/config/i386/i386.h  |  4 ----
 2 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/gcc/config/i386/i386.cc b/gcc/config/i386/i386.cc
index 3e2a3a194f1..6abb6d7a1ca 100644
--- a/gcc/config/i386/i386.cc
+++ b/gcc/config/i386/i386.cc
@@ -25794,6 +25794,19 @@ ix86_bitint_type_info (int n, struct bitint_info *info)
   return true;
 }
 
+/* Implement TARGET_C_MODE_FOR_FLOATING_TYPE.  Return DFmode, TFmode
+   or XFmode for TI_LONG_DOUBLE_TYPE which is for long double type,
+   based on long double bits, go with the default one for the others.  */
+
+static machine_mode
+ix86_c_mode_for_floating_type (enum tree_index ti)
+{
+  if (ti == TI_LONG_DOUBLE_TYPE)
+    return (TARGET_LONG_DOUBLE_64 ? DFmode
+                                 : (TARGET_LONG_DOUBLE_128 ? TFmode : XFmode));
+  return default_mode_for_floating_type (ti);
+}
+
 /* Returns modified FUNCTION_TYPE for cdtor callabi.  */
 tree
 ix86_cxx_adjust_cdtor_callabi_fntype (tree fntype)
@@ -26419,6 +26432,8 @@ static const scoped_attribute_specs *const 
ix86_attribute_table[] =
 #define TARGET_C_EXCESS_PRECISION ix86_get_excess_precision
 #undef TARGET_C_BITINT_TYPE_INFO
 #define TARGET_C_BITINT_TYPE_INFO ix86_bitint_type_info
+#undef TARGET_C_MODE_FOR_FLOATING_TYPE
+#define TARGET_C_MODE_FOR_FLOATING_TYPE ix86_c_mode_for_floating_type
 #undef TARGET_CXX_ADJUST_CDTOR_CALLABI_FNTYPE
 #define TARGET_CXX_ADJUST_CDTOR_CALLABI_FNTYPE 
ix86_cxx_adjust_cdtor_callabi_fntype
 #undef TARGET_PROMOTE_PROTOTYPES
diff --git a/gcc/config/i386/i386.h b/gcc/config/i386/i386.h
index 359a8408263..fad434c10d6 100644
--- a/gcc/config/i386/i386.h
+++ b/gcc/config/i386/i386.h
@@ -675,10 +675,6 @@ extern const char *host_detect_local_cpu (int argc, const 
char **argv);
 #define LONG_TYPE_SIZE (TARGET_X32 ? 32 : BITS_PER_WORD)
 #define POINTER_SIZE (TARGET_X32 ? 32 : BITS_PER_WORD)
 #define LONG_LONG_TYPE_SIZE 64
-#define FLOAT_TYPE_SIZE 32
-#define DOUBLE_TYPE_SIZE 64
-#define LONG_DOUBLE_TYPE_SIZE \
-  (TARGET_LONG_DOUBLE_64 ? 64 : (TARGET_LONG_DOUBLE_128 ? 128 : 80))
 
 #define WIDEST_HARDWARE_FP_SIZE 80
 
-- 
2.43.0