diff options
Diffstat (limited to 'meta/recipes-devtools/gcc/gcc-4.7/904-flatten-switch-stmt-00.patch')
-rw-r--r-- | meta/recipes-devtools/gcc/gcc-4.7/904-flatten-switch-stmt-00.patch | 76 |
1 files changed, 0 insertions, 76 deletions
diff --git a/meta/recipes-devtools/gcc/gcc-4.7/904-flatten-switch-stmt-00.patch b/meta/recipes-devtools/gcc/gcc-4.7/904-flatten-switch-stmt-00.patch deleted file mode 100644 index e790e06dcb..0000000000 --- a/meta/recipes-devtools/gcc/gcc-4.7/904-flatten-switch-stmt-00.patch +++ /dev/null | |||
@@ -1,76 +0,0 @@ | |||
1 | Upstream-Status: Pending | ||
2 | |||
3 | Hi, | ||
4 | |||
5 | The attached patch makes sure that we create smaller object code for | ||
6 | simple switch statements. We just make sure to flatten the switch | ||
7 | statement into an if-else chain, basically. | ||
8 | |||
9 | This fixes a size-regression as compared to gcc-3.4, as can be seen | ||
10 | below. | ||
11 | |||
12 | 2007-04-15 Bernhard Fischer <..> | ||
13 | |||
14 | * stmt.c (expand_case): Do not create a complex binary tree when | ||
15 | optimizing for size but rather use the simple ordered list. | ||
16 | (emit_case_nodes): do not emit jumps to the default_label when | ||
17 | optimizing for size. | ||
18 | |||
19 | Not regtested so far. | ||
20 | Comments? | ||
21 | |||
22 | Attached is the test switch.c mentioned below. | ||
23 | |||
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 | ||
25 | gcc-$i -DCHAIN -Os -o switch-CHAIN-$i.o -c switch.c ;done | ||
26 | $ 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 | ||
27 | gcc-$i -UCHAIN -Os -o switch-$i.o -c switch.c ;done | ||
28 | |||
29 | $ size switch-*.o | ||
30 | text data bss dec hex filename | ||
31 | 169 0 0 169 a9 switch-2.95.o | ||
32 | 115 0 0 115 73 switch-3.3.o | ||
33 | 103 0 0 103 67 switch-3.4.o | ||
34 | 124 0 0 124 7c switch-4.0.o | ||
35 | 124 0 0 124 7c switch-4.1.o | ||
36 | 124 0 0 124 7c switch-4.2.orig-HEAD.o | ||
37 | 95 0 0 95 5f switch-4.3-HEAD.o | ||
38 | 124 0 0 124 7c switch-4.3.orig-HEAD.o | ||
39 | 166 0 0 166 a6 switch-CHAIN-2.95.o | ||
40 | 111 0 0 111 6f switch-CHAIN-3.3.o | ||
41 | 95 0 0 95 5f switch-CHAIN-3.4.o | ||
42 | 95 0 0 95 5f switch-CHAIN-4.0.o | ||
43 | 95 0 0 95 5f switch-CHAIN-4.1.o | ||
44 | 95 0 0 95 5f switch-CHAIN-4.2.orig-HEAD.o | ||
45 | 95 0 0 95 5f switch-CHAIN-4.3-HEAD.o | ||
46 | 95 0 0 95 5f switch-CHAIN-4.3.orig-HEAD.o | ||
47 | |||
48 | |||
49 | Content-Type: text/x-diff; charset=us-ascii | ||
50 | Content-Disposition: attachment; filename="gcc-4.3.gcc-flatten-switch-stmt.00.diff" | ||
51 | |||
52 | Index: gcc-4_7-branch/gcc/stmt.c | ||
53 | =================================================================== | ||
54 | --- gcc-4_7-branch.orig/gcc/stmt.c 2012-04-10 10:19:49.095337065 -0700 | ||
55 | +++ gcc-4_7-branch/gcc/stmt.c 2012-04-10 10:32:52.219375048 -0700 | ||
56 | @@ -2397,7 +2397,11 @@ | ||
57 | default code is emitted. */ | ||
58 | |||
59 | use_cost_table = estimate_case_costs (case_list); | ||
60 | - balance_case_nodes (&case_list, NULL); | ||
61 | + /* When optimizing for size, we want a straight list to avoid | ||
62 | + jumps as much as possible. This basically creates an if-else | ||
63 | + chain. */ | ||
64 | + if (!optimize_size) | ||
65 | + balance_case_nodes (&case_list, NULL); | ||
66 | emit_case_nodes (index, case_list, default_label, index_type); | ||
67 | if (default_label) | ||
68 | emit_jump (default_label); | ||
69 | @@ -2965,6 +2969,7 @@ | ||
70 | { | ||
71 | if (!node_has_low_bound (node, index_type)) | ||
72 | { | ||
73 | + if (!optimize_size) /* don't jl to the .default_label. */ | ||
74 | emit_cmp_and_jump_insns (index, | ||
75 | convert_modes | ||
76 | (mode, imode, | ||