(find_cross_jump): Don't allow old-style and volatile asms

to match.

From-SVN: r13603

diff --git a/gcc/jump.c b/gcc/jump.c
index 1d2b3cb..e1382b3 100644 (file)
--- a/gcc/jump.c
+++ b/gcc/jump.c
@@ -2605,7 +2605,19 @@ find_cross_jump (e1, e2, minimum, f1, f2)
        }
 #endif
 
-      if (lose  || GET_CODE (p1) != GET_CODE (p2)
+      /* Don't allow old-style asm or volatile extended asms to be accepted
+        for cross jumping purposes.  It is conceptually correct to allow
+        them, since cross-jumping preserves the dynamic instruction order
+        even though it is changing the static instruction order.  However,
+        if an asm is being used to emit an assembler pseudo-op, such as
+        the MIPS `.set reorder' pseudo-op, then the static instruction order
+        matters and it must be preserved.  */
+      if (GET_CODE (p1) == ASM_INPUT || GET_CODE (p2) == ASM_INPUT
+         || (GET_CODE (p1) == ASM_OPERANDS && MEM_VOLATILE_P (p1))
+         || (GET_CODE (p2) == ASM_OPERANDS && MEM_VOLATILE_P (p2)))
+       lose = 1;
+
+      if (lose || GET_CODE (p1) != GET_CODE (p2)
          || ! rtx_renumbered_equal_p (p1, p2))
        {
          /* The following code helps take care of G++ cleanups.  */