local-alloc.c (update_equiv_regs): Do not move insns that can throw.

        * local-alloc.c (update_equiv_regs): Do not move insns that
        can throw.

From-SVN: r44655

gcc/ChangeLog

+2001-08-05  Richard Henderson  <rth@redhat.com>
+
+	* local-alloc.c (update_equiv_regs): Do not move insns that
+	can throw.
+
 2001-08-05  Jan Hubicka  <jh@suse.cz>
 
 	* Makefile.in (reload1.o): Add dedendancy on except.h

gcc/local-alloc.c

@@ -1102,6 +1102,12 @@ update_equiv_regs ()
 		abort ();
 	      equiv_insn = XEXP (reg_equiv[regno].init_insns, 0);
 
+	      /* We may not move instructions that can throw, since
+		 that changes basic block boundaries and we are not
+		 prepared to adjust the CFG to match.  */
+	      if (can_throw_internal (equiv_insn))
+		continue;
+
 	      if (asm_noperands (PATTERN (equiv_insn)) < 0
 		  && validate_replace_rtx (regno_reg_rtx[regno],
 					   reg_equiv[regno].src, insn))