re PR rtl-optimization/26655 (ICE in ix86_secondary_memory_needed, at config/i386/i386.c:16446)

	PR target/26655
	PR target/28270
	* reload.c (push_reload): Patch out the mismathcing instruction; return early.
	(find_reload): Bail out if the instruction was patched out.

From-SVN: r115928

gcc/ChangeLog

 2006-08-04  Jan Hubicka  <jh@suse.cz>
 
+	PR target/26655
+	PR target/28270
+	* reload.c (push_reload): Patch out the mismathcing instruction; return early.
+	(find_reload): Bail out if the instruction was patched out.
+
+2006-08-04  Jan Hubicka  <jh@suse.cz>
+
 	PR tree-optimization/24888
 	* tree-inline.c (expand_call_inline): Do not re-record variables.
 	(declare_inline_vars): Add variable to unexpanded_var_list.

gcc/reload.c

@@ -1254,7 +1254,19 @@ push_reload (rtx in, rtx out, rtx *inloc, rtx *outloc,
 	{
 	  error_for_asm (this_insn, "impossible register constraint "
 			 "in %<asm%>");
-	  class = ALL_REGS;
+	  /* Avoid further trouble with this insn.  */
+	  PATTERN (this_insn) = gen_rtx_USE (VOIDmode, const0_rtx);
+	  /* We used to continue here setting class to ALL_REGS, but it triggers
+	     sanity check on i386 for:
+	     void foo(long double d)
+	     {
+	       asm("" :: "a" (d));
+	     }
+	     Returning zero here ought to be safe as we take care in
+	     find_reloads to not process the reloads when instruction was
+	     replaced by USE.  */
+	    
+	  return 0;
 	}
     }
 
@@ -4133,6 +4145,12 @@ find_reloads (rtx insn, int replace, int ind_levels, int live_known,
       }
 #endif
 
+  /* If we detected error and replaced asm instruction by USE, forget about the
+     reloads.  */
+  if (GET_CODE (PATTERN (insn)) == USE
+      && GET_CODE (XEXP (PATTERN (insn), 0)) == CONST_INT)
+    n_reloads = 0;
+
   /* Perhaps an output reload can be combined with another
      to reduce needs by one.  */
   if (!goal_earlyclobber)