alpha.md: Change the initial condition of the probing loop.

2010-09-28  Tristan Gingold  <gingold@adacore.com>

	* config/alpha/alpha.md: Change the initial condition of the
	probing loop.

From-SVN: r164677

gcc/ChangeLog

+2010-09-28  Tristan Gingold  <gingold@adacore.com>
+
+	* config/alpha/alpha.md: Change the initial condition of the
+	probing loop.
+
 2010-09-28  Uros Bizjak  <ubizjak@gmail.com>
 
 	* config/i386/sse.md (*avx_<umaxmin:code><mode>3):

gcc/config/alpha/alpha.md

@@ -6588,15 +6588,17 @@
 
       emit_insn (gen_subdi3 (want, stack_pointer_rtx,
 			     force_reg (Pmode, operands[1])));
-      emit_insn (gen_adddi3 (tmp, stack_pointer_rtx, GEN_INT (-4096)));
 
       if (!CONST_INT_P (operands[1]))
 	{
+	  rtx limit = GEN_INT (4096);
 	  out_label = gen_label_rtx ();
-	  test = gen_rtx_GEU (VOIDmode, want, tmp);
-	  emit_jump_insn (gen_cbranchdi4 (test, want, tmp, out_label));
+	  test = gen_rtx_LTU (VOIDmode, operands[1], limit);
+	  emit_jump_insn
+	    (gen_cbranchdi4 (test, operands[1], limit, out_label));
 	}
 
+      emit_insn (gen_adddi3 (tmp, stack_pointer_rtx, GEN_INT (-4096)));
       emit_label (loop_label);
       memref = gen_rtx_MEM (DImode, tmp);
       MEM_VOLATILE_P (memref) = 1;