Check for invalid FAILs

[thirdparty/gcc.git] / gcc / optabs.def

diff --git a/gcc/optabs.def b/gcc/optabs.def
index 20e4225d7332d41d0a32f154444e059ce23d1fb5..8feb3942ac5fa893ac323d5bae216d4108e1fcf9 100644 (file)
--- a/gcc/optabs.def
+++ b/gcc/optabs.def
@@ -17,8 +17,29 @@ You should have received a copy of the GNU General Public License
 along with GCC; see the file COPYING3.  If not see
 <http://www.gnu.org/licenses/>.  */
 
-/* Entries here are categorized C, D, N, V.  See genopinit.c for details
-   on the meaning of the categories and for the pattern dollar codes.  */
+/* The entries in optabs.def are categorized:
+     C: A "conversion" optab, which uses two modes; has libcall data.
+     N: A "normal" optab, which uses one mode; has libcall data.
+     D: A "direct" optab, which uses one mode; does not have libcall data.
+     V: An "oVerflow" optab.  Like N, but does not record its code in
+        code_to_optab.
+
+     CX, NX, VX: An extra pattern entry for a conversion or normal optab.
+
+   These patterns may be present in the MD file with names that contain
+   the mode(s) used and the name of the operation.  This array contains
+   a list of optabs that need to be initialized.  Within each name,
+   $a and $b are used to match a short mode name (the part of the mode
+   name not including `mode' and converted to lower-case).
+
+   $I means that only full integer modes should be considered for the
+   next mode, and $F means that only float modes should be considered.
+   $P means that both full and partial integer modes should be considered.
+   $Q means that only fixed-point modes should be considered.
+
+   The pattern may be NULL if the optab exists only for the libcalls
+   that we plan to attach to it, and there are no named patterns in
+   the md files.  */
 
 /* The extension libcalls are used for float extension.  */
 OPTAB_CL(sext_optab, "extend$b$a2", SIGN_EXTEND, "extend", gen_extend_conv_libfunc)