diff options
Diffstat (limited to 'toolchain-layer/recipes-devtools/gcc/gcc-4.5/904-flatten-switch-stmt-00.patch')
-rw-r--r-- | toolchain-layer/recipes-devtools/gcc/gcc-4.5/904-flatten-switch-stmt-00.patch | 74 |
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 @@ | |||
1 | Hi, | ||
2 | |||
3 | The attached patch makes sure that we create smaller object code for | ||
4 | simple switch statements. We just make sure to flatten the switch | ||
5 | statement into an if-else chain, basically. | ||
6 | |||
7 | This fixes a size-regression as compared to gcc-3.4, as can be seen | ||
8 | below. | ||
9 | |||
10 | 2007-04-15 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 | |||
17 | Not regtested so far. | ||
18 | Comments? | ||
19 | |||
20 | Attached 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 | ||
23 | gcc-$i -DCHAIN -Os -o switch-CHAIN-$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 | ||
25 | gcc-$i -UCHAIN -Os -o switch-$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 | |||
47 | Content-Type: text/x-diff; charset=us-ascii | ||
48 | Content-Disposition: attachment; filename="gcc-4.3.gcc-flatten-switch-stmt.00.diff" | ||
49 | |||
50 | Index: 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, | ||