This patch improves compiler efficiency by placing the Homonym attribute
at offset zero. Homonym is a heavily used field.
Tested on x86_64-pc-linux-gnu, committed on trunk
gcc/ada/
* gen_il-gen.adb: Set the number of concrete nodes that have the
Homonym field to a higher number than any other field. This
isn't true, but it forces Homonym's offset to be chosen first,
so it will be at offset zero and hence slot zero.diff --git a/gcc/ada/gen_il-gen.adb b/gcc/ada/gen_il-gen.adb
--- a/gcc/ada/gen_il-gen.adb
+++ b/gcc/ada/gen_il-gen.adb
@@ -1036,6 +1036,13 @@ package body Gen_IL.Gen is
Append (All_Fields, F);
end loop;
+ -- Force Homonym to be at offset zero, which speeds up the
+ -- compiler. The Sort below will place Homonym first in
+ -- All_Fields.
+
+ Num_Concrete_Have_Field (Homonym) :=
+ Num_Concrete_Have_Field (Nkind) + 1;
+
-- Sort All_Fields based on how many concrete types have the field.
-- This is for efficiency; we want to choose the offsets of the most
-- common fields first, so they get low numbers.
