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/trunk/patches/gcc/4.3.0/275-gcc-x86-emit-cld.patch | 156 156 0 0 + /trunk/patches/gcc/4.3.0/450-gcc4-noteGNUstack.patch | 198 198 0 0 + /trunk/patches/gcc/4.3.0/550-gcc43-pr25343.patch | 21 21 0 0 + /trunk/patches/gcc/4.3.0/375-gcc43-pr35440.patch | 59 59 0 0 + /trunk/patches/gcc/4.3.0/125-gcc-trampolinewarn.patch | 35 35 0 0 + /trunk/patches/gcc/4.3.0/475-gcc43-pr35705.patch | 21 21 0 0 + /trunk/patches/gcc/4.3.0/700-204-uclibc-locale-wchar_fix.patch | 51 51 0 0 + /trunk/patches/gcc/4.3.0/775-303-c99-complex-ugly-hack.patch | 14 14 0 0 + /trunk/patches/gcc/4.3.0/575-sh-pr24836.patch | 28 28 0 0 + /trunk/patches/gcc/4.3.0/675-203-uclibc-locale-no__x.patch | 224 224 0 0 + /trunk/patches/gcc/4.3.0/400-gcc43-pr24170.patch | 61 61 0 0 + /trunk/patches/gcc/4.3.0/100-gcc-4.1-alpha-mieee-default.patch | 34 34 0 0 + /trunk/patches/gcc/4.3.0/825-305-libmudflap-susv3-legacy.patch | 49 49 0 0 + /trunk/patches/gcc/4.3.0/175-gcc-4.1-cross-compile.patch | 44 44 0 0 + /trunk/patches/gcc/4.3.0/850-306-libstdc++-namespace.patch | 38 38 0 0 + /trunk/patches/gcc/4.3.0/200-gcc-netbsd-symbolic.patch | 14 14 0 0 + /trunk/patches/gcc/4.3.0/750-301-missing-execinfo_h.patch | 13 13 0 0 + /trunk/patches/gcc/4.3.0/225-gcc-sparc64-bsd.patch | 30 30 0 0 + /trunk/patches/gcc/4.3.0/350-300-libstdc++-pic.patch | 56 56 0 0 + /trunk/patches/gcc/4.3.0/500-gcc43-pr34571.patch | 35 35 0 0 + /trunk/patches/gcc/4.3.0/300-gcc-3.4-libiberty-pic.patch | 12 12 0 0 + /trunk/patches/gcc/4.3.0/625-103-uclibc-conf-noupstream.patch | 13 13 0 0 + /trunk/patches/gcc/4.3.0/425-gcc4-ia64-noteGNUstack.patch | 96 96 0 0 + /trunk/patches/gcc/4.3.0/325-gcc4-superh-default-multilib.patch | 25 25 0 0 + /trunk/patches/gcc/4.3.0/725-205-uclibc-locale-update.patch | 355 355 0 0 ++ /trunk/patches/gcc/4.3.0/800-304-index_macro.patch | 27 27 0 0 + /trunk/patches/gcc/4.3.0/600-gcc-ca-translation-typo.patch | 19 19 0 0 + /trunk/patches/gcc/4.3.0/650-200-uclibc-locale.patch | 2794 2794 0 0 +++++++++++++++ /trunk/patches/gcc/4.3.0/525-gcc43-pr35982.patch | 23 23 0 0 + /trunk/patches/gcc/4.3.0/150-gcc43-java-nomulti.patch | 47 47 0 0 + /trunk/patches/gcc/4.3.0/250-904-flatten-switch-stmt-00.patch | 76 76 0 0 + /trunk/patches/gcc/4.3.1/100-gcc-4.1-alpha-mieee-default.patch | 34 34 0 0 + /trunk/patches/gcc/4.3.1/500-103-uclibc-conf-noupstream.patch | 13 13 0 0 + /trunk/patches/gcc/4.3.1/175-gcc-4.1-cross-compile.patch | 44 44 0 0 + /trunk/patches/gcc/4.3.1/400-gcc4-noteGNUstack.patch | 198 198 0 0 + /trunk/patches/gcc/4.3.1/600-205-uclibc-locale-update.patch | 355 355 0 0 ++ /trunk/patches/gcc/4.3.1/725-306-libstdc++-namespace.patch | 38 38 0 0 + /trunk/patches/gcc/4.3.1/350-gcc43-pr24170.patch | 61 61 0 0 + /trunk/patches/gcc/4.3.1/300-gcc4-superh-default-multilib.patch | 25 25 0 0 + /trunk/patches/gcc/4.3.1/575-204-uclibc-locale-wchar_fix.patch | 51 51 0 0 + /trunk/patches/gcc/4.3.1/200-gcc-netbsd-symbolic.patch | 14 14 0 0 + /trunk/patches/gcc/4.3.1/225-gcc-sparc64-bsd.patch | 30 30 0 0 + /trunk/patches/gcc/4.3.1/450-gcc43-pr25343.patch | 21 21 0 0 + /trunk/patches/gcc/4.3.1/625-301-missing-execinfo_h.patch | 13 13 0 0 + /trunk/patches/gcc/4.3.1/325-300-libstdc++-pic.patch | 56 56 0 0 + /trunk/patches/gcc/4.3.1/425-gcc43-pr34571.patch | 35 35 0 0 + /trunk/patches/gcc/4.3.1/375-gcc4-ia64-noteGNUstack.patch | 96 96 0 0 + /trunk/patches/gcc/4.3.1/125-gcc-trampolinewarn.patch | 35 35 0 0 + /trunk/patches/gcc/4.3.1/275-gcc-3.4-libiberty-pic.patch | 12 12 0 0 + /trunk/patches/gcc/4.3.1/650-303-c99-complex-ugly-hack.patch | 14 14 0 0 + /trunk/patches/gcc/4.3.1/525-200-uclibc-locale.patch | 2794 2794 0 0 +++++++++++++++ /trunk/patches/gcc/4.3.1/550-203-uclibc-locale-no__x.patch | 224 224 0 0 + /trunk/patches/gcc/4.3.1/150-gcc43-java-nomulti.patch | 47 47 0 0 + /trunk/patches/gcc/4.3.1/700-305-libmudflap-susv3-legacy.patch | 49 49 0 0 + /trunk/patches/gcc/4.3.1/675-304-index_macro.patch | 27 27 0 0 + /trunk/patches/gcc/4.3.1/250-904-flatten-switch-stmt-00.patch | 76 76 0 0 + /trunk/patches/gcc/4.3.1/475-sh-pr24836.patch | 28 28 0 0 + 57 files changed, 9058 insertions(+)
77 lines
3.0 KiB
Diff
77 lines
3.0 KiB
Diff
Original patch from gentoo: gentoo/src/patchsets/gcc/4.3.0/gentoo/18_all_904-flatten-switch-stmt-00.patch
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http://gcc.gnu.org/ml/gcc-patches/2007-04/msg00927.html
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Hi,
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The attached patch makes sure that we create smaller object code for
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simple switch statements. We just make sure to flatten the switch
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statement into an if-else chain, basically.
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This fixes a size-regression as compared to gcc-3.4, as can be seen
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below.
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2007-04-15 Bernhard Fischer <..>
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* stmt.c (expand_case): Do not create a complex binary tree when
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optimizing for size but rather use the simple ordered list.
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(emit_case_nodes): do not emit jumps to the default_label when
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optimizing for size.
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Not regtested so far.
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Comments?
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Attached is the test switch.c mentioned below.
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$ 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
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gcc-$i -DCHAIN -Os -o switch-CHAIN-$i.o -c switch.c ;done
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$ 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
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gcc-$i -UCHAIN -Os -o switch-$i.o -c switch.c ;done
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$ size switch-*.o
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text data bss dec hex filename
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169 0 0 169 a9 switch-2.95.o
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115 0 0 115 73 switch-3.3.o
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103 0 0 103 67 switch-3.4.o
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124 0 0 124 7c switch-4.0.o
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124 0 0 124 7c switch-4.1.o
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124 0 0 124 7c switch-4.2.orig-HEAD.o
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95 0 0 95 5f switch-4.3-HEAD.o
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124 0 0 124 7c switch-4.3.orig-HEAD.o
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166 0 0 166 a6 switch-CHAIN-2.95.o
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111 0 0 111 6f switch-CHAIN-3.3.o
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95 0 0 95 5f switch-CHAIN-3.4.o
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95 0 0 95 5f switch-CHAIN-4.0.o
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95 0 0 95 5f switch-CHAIN-4.1.o
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95 0 0 95 5f switch-CHAIN-4.2.orig-HEAD.o
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95 0 0 95 5f switch-CHAIN-4.3-HEAD.o
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95 0 0 95 5f switch-CHAIN-4.3.orig-HEAD.o
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Content-Type: text/x-diff; charset=us-ascii
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Content-Disposition: attachment; filename="gcc-4.3.gcc-flatten-switch-stmt.00.diff"
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diff -durN gcc-4.3.0.orig/gcc/stmt.c gcc-4.3.0/gcc/stmt.c
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--- gcc-4.3.0.orig/gcc/stmt.c 2007-12-04 22:55:32.000000000 +0100
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+++ gcc-4.3.0/gcc/stmt.c 2008-06-10 14:44:33.000000000 +0200
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@@ -2508,7 +2508,11 @@
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use_cost_table
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= (TREE_CODE (orig_type) != ENUMERAL_TYPE
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&& estimate_case_costs (case_list));
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- balance_case_nodes (&case_list, NULL);
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+ /* When optimizing for size, we want a straight list to avoid
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+ jumps as much as possible. This basically creates an if-else
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+ chain. */
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+ if (!optimize_size)
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+ balance_case_nodes (&case_list, NULL);
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emit_case_nodes (index, case_list, default_label, index_type);
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emit_jump (default_label);
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}
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@@ -3066,6 +3070,7 @@
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{
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if (!node_has_low_bound (node, index_type))
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{
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+ if (!optimize_size) /* don't jl to the .default_label. */
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emit_cmp_and_jump_insns (index,
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convert_modes
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(mode, imode,
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