rust: Replace uses of {FLOAT,{,LONG_}DOUBLE}_TYPE_SIZE

Joseph pointed out "floating types should have their mode,
not a poorly defined precision value" in the discussion[1],
as he and Richi suggested, the existing macros
{FLOAT,{,LONG_}DOUBLE}_TYPE_SIZE will be replaced with a
hook mode_for_floating_type.  To be prepared for that, this
patch is to replace use of {FLOAT,{,LONG_}DOUBLE}_TYPE_SIZE
in rust with TYPE_PRECISION of {float,{,long_}double}_type_node.

[1] https://gcc.gnu.org/pipermail/gcc-patches/2024-May/651209.html

gcc/rust/ChangeLog:

	* rust-gcc.cc (float_type): Use TYPE_PRECISION of
	{float,double,long_double}_type_node to replace
	{FLOAT,DOUBLE,LONG_DOUBLE}_TYPE_SIZE.

diff --git a/gcc/rust/rust-gcc.cc b/gcc/rust/rust-gcc.cc
index f17e19a2dfcff9c5a260e5ae57247fd20888ed11..38169c08985d3057018f12a04071b89c6bf2d57d 100644 (file)
--- a/gcc/rust/rust-gcc.cc
+++ b/gcc/rust/rust-gcc.cc
@@ -411,11 +411,11 @@ tree
 float_type (int bits)
 {
   tree type;
-  if (bits == FLOAT_TYPE_SIZE)
+  if (bits == TYPE_PRECISION (float_type_node))
     type = float_type_node;
-  else if (bits == DOUBLE_TYPE_SIZE)
+  else if (bits == TYPE_PRECISION (double_type_node))
     type = double_type_node;
-  else if (bits == LONG_DOUBLE_TYPE_SIZE)
+  else if (bits == TYPE_PRECISION (long_double_type_node))
     type = long_double_type_node;
   else
     {