* optabs.c (prepare_cmp_insn): Update documentation comment.

From-SVN: r240108

gcc/ChangeLog

+2016-09-13  Maciej W. Rozycki  <macro@imgtec.com>
+
+	* optabs.c (prepare_cmp_insn): Update documentation comment.
+
 2016-09-13  Jakub Jelinek  <jakub@redhat.com>
 	    Manuel Lopez-Ibanez  <manu@gcc.gnu.org>
 

gcc/optabs.c

@@ -3716,13 +3716,17 @@ can_compare_p (enum rtx_code code, machine_mode mode,
 }
 
 /* This function is called when we are going to emit a compare instruction that
-   compares the values found in *PX and *PY, using the rtl operator COMPARISON.
+   compares the values found in X and Y, using the rtl operator COMPARISON.
 
-   *PMODE is the mode of the inputs (in case they are const_int).
-   *PUNSIGNEDP nonzero says that the operands are unsigned;
+   If they have mode BLKmode, then SIZE specifies the size of both operands.
+
+   UNSIGNEDP nonzero says that the operands are unsigned;
    this matters if they need to be widened (as given by METHODS).
 
-   If they have mode BLKmode, then SIZE specifies the size of both operands.
+   *PTEST is where the resulting comparison RTX is returned or NULL_RTX
+   if we failed to produce one.
+
+   *PMODE is the mode of the inputs (in case they are const_int).
 
    This function performs all the setup necessary so that the caller only has
    to emit a single comparison insn.  This setup can involve doing a BLKmode