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-rw-r--r--toolchain-layer/recipes-devtools/gcc/gcc-4.5/904-flatten-switch-stmt-00.patch74
1 files changed, 0 insertions, 74 deletions
diff --git a/toolchain-layer/recipes-devtools/gcc/gcc-4.5/904-flatten-switch-stmt-00.patch b/toolchain-layer/recipes-devtools/gcc/gcc-4.5/904-flatten-switch-stmt-00.patch
deleted file mode 100644
index c4641dc63..000000000
--- a/toolchain-layer/recipes-devtools/gcc/gcc-4.5/904-flatten-switch-stmt-00.patch
+++ /dev/null
@@ -1,74 +0,0 @@
1Hi,
2
3The attached patch makes sure that we create smaller object code for
4simple switch statements. We just make sure to flatten the switch
5statement into an if-else chain, basically.
6
7This fixes a size-regression as compared to gcc-3.4, as can be seen
8below.
9
102007-04-15 Bernhard Fischer <..>
11
12 * stmt.c (expand_case): Do not create a complex binary tree when
13 optimizing for size but rather use the simple ordered list.
14 (emit_case_nodes): do not emit jumps to the default_label when
15 optimizing for size.
16
17Not regtested so far.
18Comments?
19
20Attached is the test switch.c mentioned below.
21
22$ for i in 2.95 3.3 3.4 4.0 4.1 4.2.orig-HEAD 4.3.orig-HEAD 4.3-HEAD;do
23gcc-$i -DCHAIN -Os -o switch-CHAIN-$i.o -c switch.c ;done
24$ for i in 2.95 3.3 3.4 4.0 4.1 4.2.orig-HEAD 4.3.orig-HEAD 4.3-HEAD;do
25gcc-$i -UCHAIN -Os -o switch-$i.o -c switch.c ;done
26
27$ size switch-*.o
28 text data bss dec hex filename
29 169 0 0 169 a9 switch-2.95.o
30 115 0 0 115 73 switch-3.3.o
31 103 0 0 103 67 switch-3.4.o
32 124 0 0 124 7c switch-4.0.o
33 124 0 0 124 7c switch-4.1.o
34 124 0 0 124 7c switch-4.2.orig-HEAD.o
35 95 0 0 95 5f switch-4.3-HEAD.o
36 124 0 0 124 7c switch-4.3.orig-HEAD.o
37 166 0 0 166 a6 switch-CHAIN-2.95.o
38 111 0 0 111 6f switch-CHAIN-3.3.o
39 95 0 0 95 5f switch-CHAIN-3.4.o
40 95 0 0 95 5f switch-CHAIN-4.0.o
41 95 0 0 95 5f switch-CHAIN-4.1.o
42 95 0 0 95 5f switch-CHAIN-4.2.orig-HEAD.o
43 95 0 0 95 5f switch-CHAIN-4.3-HEAD.o
44 95 0 0 95 5f switch-CHAIN-4.3.orig-HEAD.o
45
46
47Content-Type: text/x-diff; charset=us-ascii
48Content-Disposition: attachment; filename="gcc-4.3.gcc-flatten-switch-stmt.00.diff"
49
50Index: gcc-4.5.0/gcc/stmt.c
51===================================================================
52--- gcc-4.5.0.orig/gcc/stmt.c 2010-02-19 01:53:51.000000000 -0800
53+++ gcc-4.5.0/gcc/stmt.c 2010-06-25 11:05:31.816881094 -0700
54@@ -2440,7 +2440,11 @@
55 default code is emitted. */
56
57 use_cost_table = estimate_case_costs (case_list);
58- balance_case_nodes (&case_list, NULL);
59+ /* When optimizing for size, we want a straight list to avoid
60+ jumps as much as possible. This basically creates an if-else
61+ chain. */
62+ if (!optimize_size)
63+ balance_case_nodes (&case_list, NULL);
64 emit_case_nodes (index, case_list, default_label, index_type);
65 if (default_label)
66 emit_jump (default_label);
67@@ -3008,6 +3012,7 @@
68 {
69 if (!node_has_low_bound (node, index_type))
70 {
71+ if (!optimize_size) /* don't jl to the .default_label. */
72 emit_cmp_and_jump_insns (index,
73 convert_modes
74 (mode, imode,