patches/gcc/4.2.1/260-flatten-switch-stmt-00.patch
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Sat Dec 31 18:47:37 2011 +0100 (2011-12-31)
changeset 2829 0c3c95f911ec
parent 313 2f223aafc7cb
permissions -rw-r--r--
docs: credit Konrad EISELE for the initial multilib support

Konrad submitted an initial patch adding multlib support:
http://sourceware.org/ml/crossgcc/2011-11/msg00040.html

The patch was full of good ideas, but had a few issues, so
I (Yann E. MORIN) started it all from scatch, re-using part
of the original patch. This got implemented in this series:
hg log -r 446a17b5dd1e:e47d17391ae3

As I forgot to credit Konrad in these changelogs, update the
docs so that the work by Konrad gets credited. Without his
initial effort, we would probably not have had multlib support
so soon. Thank you Konrad!

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
yann@313
     1
diff -durN gcc-4.2.1.orig/gcc/stmt.c gcc-4.2.1/gcc/stmt.c
yann@313
     2
--- gcc-4.2.1.orig/gcc/stmt.c	2007-07-19 05:25:32.000000000 +0200
yann@313
     3
+++ gcc-4.2.1/gcc/stmt.c	2007-08-03 20:37:19.000000000 +0200
yann@313
     4
@@ -2512,7 +2512,11 @@
yann@313
     5
 	  use_cost_table
yann@313
     6
 	    = (TREE_CODE (orig_type) != ENUMERAL_TYPE
yann@313
     7
 	       && estimate_case_costs (case_list));
yann@313
     8
-	  balance_case_nodes (&case_list, NULL);
yann@313
     9
+	  /* When optimizing for size, we want a straight list to avoid
yann@313
    10
+	     jumps as much as possible. This basically creates an if-else
yann@313
    11
+	     chain.  */
yann@313
    12
+	  if (!optimize_size)
yann@313
    13
+	    balance_case_nodes (&case_list, NULL);
yann@313
    14
 	  emit_case_nodes (index, case_list, default_label, index_type);
yann@313
    15
 	  emit_jump (default_label);
yann@313
    16
 	}
yann@313
    17
@@ -3070,6 +3074,7 @@
yann@313
    18
 	    {
yann@313
    19
 	      if (!node_has_low_bound (node, index_type))
yann@313
    20
 		{
yann@313
    21
+		  if (!optimize_size) /* don't jl to the .default_label. */
yann@313
    22
 		  emit_cmp_and_jump_insns (index,
yann@313
    23
 					   convert_modes
yann@313
    24
 					   (mode, imode,