patches/gcc/4.4.3/190-flatten-switch-stmt-00.patch
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Mon Mar 28 01:05:18 2011 +0200 (2011-03-28)
changeset 2362 0888065f8c4d
parent 1611 e2516bba8fe5
permissions -rw-r--r--
cc/gcc: cleanup the _or_later logic

So far, we've had a version always select appropriate _or_later option,
which in turn would select all previous _or_later options.

Because the dependencies on companion libs were cumulative, that was
working OK. But the upcoming 4.6 will no longer depend on libelf, so
we can't keep the cumulative scheme we've been using so far.

Have each release family select the corresponding dependencies, instead
of relying on selecting previous _or_later.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
yann@1393
     1
diff -durN gcc-4.4.0.orig/gcc/stmt.c gcc-4.4.0/gcc/stmt.c
yann@1393
     2
--- gcc-4.4.0.orig/gcc/stmt.c	2009-02-27 20:49:42.000000000 +0100
yann@1393
     3
+++ gcc-4.4.0/gcc/stmt.c	2009-05-27 21:38:21.000000000 +0200
yann@1393
     4
@@ -2376,7 +2376,11 @@
yann@1393
     5
 	  use_cost_table
yann@1393
     6
 	    = (TREE_CODE (orig_type) != ENUMERAL_TYPE
yann@1393
     7
 	       && estimate_case_costs (case_list));
yann@1393
     8
-	  balance_case_nodes (&case_list, NULL);
yann@1393
     9
+	  /* When optimizing for size, we want a straight list to avoid
yann@1393
    10
+	     jumps as much as possible. This basically creates an if-else
yann@1393
    11
+	     chain.  */
yann@1393
    12
+	  if (!optimize_size)
yann@1393
    13
+	    balance_case_nodes (&case_list, NULL);
yann@1393
    14
 	  emit_case_nodes (index, case_list, default_label, index_type);
yann@1393
    15
 	  if (default_label)
yann@1393
    16
 	    emit_jump (default_label);
yann@1393
    17
@@ -2942,6 +2946,7 @@
yann@1393
    18
 	    {
yann@1393
    19
 	      if (!node_has_low_bound (node, index_type))
yann@1393
    20
 		{
yann@1393
    21
+		  if (!optimize_size) /* don't jl to the .default_label. */
yann@1393
    22
 		  emit_cmp_and_jump_insns (index,
yann@1393
    23
 					   convert_modes
yann@1393
    24
 					   (mode, imode,