fixed comment in dwarf2out.c

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/wide-int@205363 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/dwarf2out.c b/gcc/dwarf2out.c
index 04d4988..2b7d034 100644 (file)
--- a/gcc/dwarf2out.c
+++ b/gcc/dwarf2out.c
@@ -12880,10 +12880,15 @@ mem_loc_descriptor (rtx rtl, enum machine_mode mode,
        {
          dw_die_ref type_die;
 
-         /* Note that a CONST_DOUBLE rtx could represent either an integer
-            or a floating-point constant.  A CONST_DOUBLE is used whenever
-            the constant requires more than one word in order to be
-            adequately represented.  We output CONST_DOUBLEs as blocks.  */
+         /* Note that if TARGET_SUPPORTS_WIDE_INT == 0, a
+            CONST_DOUBLE rtx could represent either an large integer
+            or a floating-point constant.  If
+            TARGET_SUPPORTS_WIDE_INT != 0, the value is always a
+            floating point constant.
+
+            When it is an integer, a CONST_DOUBLE is used whenever
+            the constant requires 2 HWIs to be adequately
+            represented.  We output CONST_DOUBLEs as blocks.  */
          if (mode == VOIDmode
              || (GET_MODE (rtl) == VOIDmode
                  && GET_MODE_BITSIZE (mode) != HOST_BITS_PER_DOUBLE_INT))