diff options
Diffstat (limited to 'toolchain/gcc/4.2.4/904-flatten-switch-stmt-00.patch')
| -rw-r--r-- | toolchain/gcc/4.2.4/904-flatten-switch-stmt-00.patch | 153 |
1 files changed, 0 insertions, 153 deletions
diff --git a/toolchain/gcc/4.2.4/904-flatten-switch-stmt-00.patch b/toolchain/gcc/4.2.4/904-flatten-switch-stmt-00.patch deleted file mode 100644 index 8fac37c4d..000000000 --- a/toolchain/gcc/4.2.4/904-flatten-switch-stmt-00.patch +++ /dev/null @@ -1,153 +0,0 @@ -Hi, - -The attached patch makes sure that we create smaller object code for -simple switch statements. We just make sure to flatten the switch -statement into an if-else chain, basically. - -This fixes a size-regression as compared to gcc-3.4, as can be seen -below. - -2007-04-15 Bernhard Fischer <..> - - * stmt.c (expand_case): Do not create a complex binary tree when - optimizing for size but rather use the simple ordered list. - (emit_case_nodes): do not emit jumps to the default_label when - optimizing for size. - -Not regtested so far. -Comments? - -Attached is the test switch.c mentioned below. - -$ 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 -gcc-$i -DCHAIN -Os -o switch-CHAIN-$i.o -c switch.c ;done -$ 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 -gcc-$i -UCHAIN -Os -o switch-$i.o -c switch.c ;done - -$ size switch-*.o - text data bss dec hex filename - 169 0 0 169 a9 switch-2.95.o - 115 0 0 115 73 switch-3.3.o - 103 0 0 103 67 switch-3.4.o - 124 0 0 124 7c switch-4.0.o - 124 0 0 124 7c switch-4.1.o - 124 0 0 124 7c switch-4.2.orig-HEAD.o - 95 0 0 95 5f switch-4.3-HEAD.o - 124 0 0 124 7c switch-4.3.orig-HEAD.o - 166 0 0 166 a6 switch-CHAIN-2.95.o - 111 0 0 111 6f switch-CHAIN-3.3.o - 95 0 0 95 5f switch-CHAIN-3.4.o - 95 0 0 95 5f switch-CHAIN-4.0.o - 95 0 0 95 5f switch-CHAIN-4.1.o - 95 0 0 95 5f switch-CHAIN-4.2.orig-HEAD.o - 95 0 0 95 5f switch-CHAIN-4.3-HEAD.o - 95 0 0 95 5f switch-CHAIN-4.3.orig-HEAD.o - - -Content-Type: text/x-diff; charset=us-ascii -Content-Disposition: attachment; filename="gcc-4.3.gcc-flatten-switch-stmt.00.diff" - -Index: gcc-4.2.0/gcc/stmt.c -=================================================================== ---- gcc-4.2.0.orig/gcc/stmt.c (revision 123843) -+++ gcc-4.2.0/gcc/stmt.c (working copy) -@@ -2517,7 +2517,11 @@ expand_case (tree exp) - 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); - emit_jump (default_label); - } -@@ -3075,6 +3079,7 @@ emit_case_nodes (rtx index, case_node_pt - { - 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, - - -Content-Type: text/x-csrc; charset=us-ascii -Content-Disposition: attachment; filename="switch.c" - -int -commutative_tree_code (int code) -{ -#define CASE(val, ret) case val:/* __asm__("# val="#val ",ret="#ret);*/ return ret; -#ifndef CHAIN - switch (code) - { -# if 1 - CASE(1,3) - CASE(3,2) - CASE(5,8) - CASE(7,1) - CASE(33,4) - CASE(44,9) - CASE(55,10) - CASE(66,-1) - CASE(77,99) - CASE(666,0) -# else - case 1: - return 3; - case 3: - return 2; - case 5: - return 8; - case 7: - return 1; - case 33: - return 4; - case 44: - return 9; - case 55: - return 10; - case 66: - return -1; - case 77: - return 99; - case 666: - return 0; -# endif - default: - break; - } - return 4711; - -#else - if (code == 1) - return 3; - else if (code == 3) - return 2; - else if (code == 5) - return 8; - else if (code == 7) - return 1; - else if (code == 33) - return 4; - else if (code == 44) - return 9; - else if (code == 55) - return 10; - else if (code == 66) - return -1; - else if (code == 77) - return 99; - else if (code == 666) - return 0; - else - return 4711; -#endif -} - - ---AhhlLboLdkugWU4S-- - |