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path: root/patches/gcc/4.4.4/190-flatten-switch-stmt-00.patch
blob: 03b806057fe1c84def14d2fd23fe4f9da49d6f2b (plain)
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diff -durN gcc-4.4.4.orig/gcc/stmt.c gcc-4.4.4/gcc/stmt.c
--- gcc-4.4.4.orig/gcc/stmt.c	2010-03-08 12:46:28.000000000 +0100
+++ gcc-4.4.4/gcc/stmt.c	2010-05-16 19:12:31.000000000 +0200
@@ -2377,7 +2377,11 @@
 	  use_cost_table
 	    = (TREE_CODE (orig_type) != ENUMERAL_TYPE
 	       && estimate_case_costs (case_list));
-	  balance_case_nodes (&case_list, NULL);
+	  /* When optimizing for size, we want a straight list to avoid
+	     jumps as much as possible. This basically creates an if-else
+	     chain.  */
+	  if (!optimize_size)
+	    balance_case_nodes (&case_list, NULL);
 	  emit_case_nodes (index, case_list, default_label, index_type);
 	  if (default_label)
 	    emit_jump (default_label);
@@ -2943,6 +2947,7 @@
 	    {
 	      if (!node_has_low_bound (node, index_type))
 		{
+		  if (!optimize_size) /* don't jl to the .default_label. */
 		  emit_cmp_and_jump_insns (index,
 					   convert_modes
 					   (mode, imode,