re PR target/45189 (New stack alignment test failures)

PR target/45189
Fix unwind for i386 stack re-alignment.

From-SVN: r162919

gcc/ChangeLog

+2010-08-05  Richard Henderson  <rth@redhat.com>
+
+	PR target/45189
+	* config/i386/i386.c (ix86_emit_save_reg_using_mov): Make sure
+	the alignment constant is properly sign-extended.
+
 2010-08-05  Richard Guenther  <rguenther@suse.de>
 
 	* expr.c (store_expr): Use emit_block_move only if both
@@ -6,7 +12,7 @@
 
 2010-08-05  Richard Henderson  <rth@redhat.com>
 
-	PR 45189
+	PR debug/45188
 	* dwarf2out.c (DWARF2_UNWIND_INFO): Provide default definition.
 	(INCOMING_RETURN_ADDR_RTX): Likewise.
 	(dwarf2out_do_frame): Remove conditional compilation.

gcc/config/i386/i386.c

@@ -8639,7 +8639,8 @@ ix86_emit_save_reg_using_mov (enum machine_mode mode, unsigned int regno,
 	     reference to the locations within the frame.  Instead,
 	     simply compute the location of the aligned frame from
 	     the frame pointer.  */
-	  addr = GEN_INT (-crtl->stack_alignment_needed / BITS_PER_UNIT);
+	  addr = GEN_INT (-(HOST_WIDE_INT)crtl->stack_alignment_needed
+			  / BITS_PER_UNIT);
 	  addr = gen_rtx_AND (Pmode, hard_frame_pointer_rtx, addr);
 	  addr = plus_constant (addr, -cfa_offset);
 	  mem = gen_rtx_MEM (mode, addr);