re PR target/21716 (ICE in reg-stack.c's swap_rtx_condition)

	PR target/21716
	* reg-stack.c (swap_rtx_condition): Don't crash if %ax user was not
	found in the basic block and last insn in the basic block is not
	INSN_P.  Remove explicit unspec numbers that are no longer valid
	from comments.

From-SVN: r100196

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 73e46756c09efed8410bed79f6b0872ce6a9d6f3..dbf8fc49b6838677ef7649ae924cd0da6b5f40f5 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,11 @@
+2005-05-26  Jakub Jelinek  <jakub@redhat.com>
+
+       PR target/21716
+       * reg-stack.c (swap_rtx_condition): Don't crash if %ax user was not
+       found in the basic block and last insn in the basic block is not
+       INSN_P.  Remove explicit unspec numbers that are no longer valid
+       from comments.
+
 2005-05-26  Paolo Bonzini  <bonzini@gnu.org>
 
        * tree-vect-transform.c (vectorizable_operation): Try word_mode

diff --git a/gcc/reg-stack.c b/gcc/reg-stack.c
index a49d9e9a10860e974b9098a5ea217b1e2adcf1dc..acf5f41d030b0ff480ca10fbc3d01e85d0e56d27 100644 (file)
--- a/gcc/reg-stack.c
+++ b/gcc/reg-stack.c
@@ -1231,9 +1231,9 @@ swap_rtx_condition (rtx insn)
       pat = PATTERN (insn);
     }
 
-  /* See if this is, or ends in, a fnstsw, aka unspec 9.  If so, we're
-     not doing anything with the cc value right now.  We may be able to
-     search for one though.  */
+  /* See if this is, or ends in, a fnstsw.  If so, we're not doing anything
+     with the cc value right now.  We may be able to search for one
+     though.  */
 
   if (GET_CODE (pat) == SET
       && GET_CODE (SET_SRC (pat)) == UNSPEC
@@ -1252,9 +1252,13 @@ swap_rtx_condition (rtx insn)
            return 0;
        }
 
+      /* We haven't found it.  */
+      if (insn == BB_END (current_block))
+       return 0;
+
       /* So we've found the insn using this value.  If it is anything
-        other than sahf, aka unspec 10, or the value does not die
-        (meaning we'd have to search further), then we must give up.  */
+        other than sahf or the value does not die (meaning we'd have
+        to search further), then we must give up.  */
       pat = PATTERN (insn);
       if (GET_CODE (pat) != SET
          || GET_CODE (SET_SRC (pat)) != UNSPEC