PR tree-optimization/42027

	* cfgexpand.c (expand_gimple_cond): Use jumpy sequence for &, &&, |
	and || if jumps are cheap.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@155367 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index be75066..0c02d32 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2009-12-20  Michael Matz  <matz@suse.de>
+
+       PR tree-optimization/42027
+       * cfgexpand.c (expand_gimple_cond): Use jumpy sequence for &, &&, |
+       and || if jumps are cheap.
+
 2009-12-19  Richard Guenther  <rguenther@suse.de>
 
        PR lto/42401

diff --git a/gcc/cfgexpand.c b/gcc/cfgexpand.c
index 08b211e..b0921bf 100644 (file)
--- a/gcc/cfgexpand.c
+++ b/gcc/cfgexpand.c
@@ -1606,13 +1606,35 @@ expand_gimple_cond (basic_block bb, gimple stmt)
       && bitmap_bit_p (SA.values, SSA_NAME_VERSION (op0)))
     {
       gimple second = SSA_NAME_DEF_STMT (op0);
-      if (gimple_code (second) == GIMPLE_ASSIGN
-         && TREE_CODE_CLASS (gimple_assign_rhs_code (second))
-            == tcc_comparison)
+      if (gimple_code (second) == GIMPLE_ASSIGN)
        {
-         code = gimple_assign_rhs_code (second);
-         op0 = gimple_assign_rhs1 (second);
-         op1 = gimple_assign_rhs2 (second);
+         enum tree_code code2 = gimple_assign_rhs_code (second);
+         if (TREE_CODE_CLASS (code2) == tcc_comparison)
+           {
+             code = code2;
+             op0 = gimple_assign_rhs1 (second);
+             op1 = gimple_assign_rhs2 (second);
+           }
+         /* If jumps are cheap turn some more codes into
+            jumpy sequences.  */
+         else if (BRANCH_COST (optimize_insn_for_speed_p (), false) < 4)
+           {
+             if ((code2 == BIT_AND_EXPR
+                  && TYPE_PRECISION (TREE_TYPE (op0)) == 1
+                  && TREE_CODE (gimple_assign_rhs2 (second)) != INTEGER_CST)
+                 || code2 == TRUTH_AND_EXPR)
+               {
+                 code = TRUTH_ANDIF_EXPR;
+                 op0 = gimple_assign_rhs1 (second);
+                 op1 = gimple_assign_rhs2 (second);
+               }
+             else if (code2 == BIT_IOR_EXPR || code2 == TRUTH_OR_EXPR)
+               {
+                 code = TRUTH_ORIF_EXPR;
+                 op0 = gimple_assign_rhs1 (second);
+                 op1 = gimple_assign_rhs2 (second);
+               }
+           }
        }
     }