patches/gcc/4.4.6/190-flatten-switch-stmt-00.patch
author "Benoît Thébaudeau" <benoit.thebaudeau@advansee.com>
Tue Feb 05 12:29:52 2013 +0100 (2013-02-05)
changeset 3183 4e8bfe85da61
parent 2149 98b7806295cc
permissions -rw-r--r--
samples: add arm-cortexa9_neon-linux-gnueabihf

Signed-off-by: "Benoît Thébaudeau" <benoit.thebaudeau@advansee.com>
[yann.morin.1998@free.fr: make it a defconfig with pinned versions]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Message-Id: <bdf1fde968aee8d0cd95.1360063830@advdt005-ubuntu>
Patchwork-Id: 218239
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diff -durN gcc-4.4.5.orig/gcc/stmt.c gcc-4.4.5/gcc/stmt.c
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--- gcc-4.4.5.orig/gcc/stmt.c	2010-03-08 12:46:28.000000000 +0100
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+++ gcc-4.4.5/gcc/stmt.c	2010-10-09 23:01:01.000000000 +0200
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@@ -2377,7 +2377,11 @@
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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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 	  if (default_label)
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 	    emit_jump (default_label);
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@@ -2943,6 +2947,7 @@
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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,