Simplify the raise instruction to reduce code size

The raise/2 instruction is almost always used like this:

  raise x(2) x(1)

Therefore, we can translate it to an internal i_raise/0
instruction that uses x(2) x(1) as its implicit operands.

We will also remove the backward compatibility with R10-0.  It is
unlikely that anyone still is using BEAM files compiled with the R10-0
compiler, especially since most of those modules cannot be loaded. The
loader will refuse to load any module that uses the old non-GCIng
arithmetic instructions or the non-GCing versions of length/1 or
size/1.

Doing these changes will reduce both the size of the loaded BEAM
code and size of the code in process_main().

1 files changed, 8 insertions, 1 deletions

diff --git a/erts/emulator/beam/ops.tab b/erts/emulator/beam/ops.tab
index 15f27835a8..96a3a72bb5 100644
--- a/erts/emulator/beam/ops.tab
+++ b/erts/emulator/beam/ops.tab
@@ -251,7 +251,14 @@ case_end x
 badmatch x
 
 if_end
-raise s s
+
+# Operands for raise/2 are almost always in x(2) and x(1).
+# Optimize for that case.
+raise x==2 x==1 => i_raise
+raise Trace=y Value=y => move Trace x=2 | move Value x=1 | i_raise
+raise Trace Value => move Trace x=3 | move Value x=1 | move x=3 x=2 | i_raise
+
+i_raise
 
 # Internal now, but could be useful to make known to the compiler.
 badarg j