Issue #4753: By enabling a configure option named '--with-computed-gotos'

on compilers that support it (notably: gcc, SunPro, icc), the bytecode
evaluation loop is compiled with a new dispatch mechanism which gives
speedups of up to 20%, depending on the system, on various benchmarks.

1 files changed, 258 insertions, 0 deletions

diff --git a/Python/opcode_targets.h b/Python/opcode_targets.h
new file mode 100644
index 0000000..c662717
--- /dev/null
+++ b/Python/opcode_targets.h
@@ -0,0 +1,258 @@
+static void *opcode_targets[256] = {
+	&&_unknown_opcode,
+	&&TARGET_POP_TOP,
+	&&TARGET_ROT_TWO,
+	&&TARGET_ROT_THREE,
+	&&TARGET_DUP_TOP,
+	&&TARGET_ROT_FOUR,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&TARGET_NOP,
+	&&TARGET_UNARY_POSITIVE,
+	&&TARGET_UNARY_NEGATIVE,
+	&&TARGET_UNARY_NOT,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&TARGET_UNARY_INVERT,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&TARGET_BINARY_POWER,
+	&&TARGET_BINARY_MULTIPLY,
+	&&_unknown_opcode,
+	&&TARGET_BINARY_MODULO,
+	&&TARGET_BINARY_ADD,
+	&&TARGET_BINARY_SUBTRACT,
+	&&TARGET_BINARY_SUBSCR,
+	&&TARGET_BINARY_FLOOR_DIVIDE,
+	&&TARGET_BINARY_TRUE_DIVIDE,
+	&&TARGET_INPLACE_FLOOR_DIVIDE,
+	&&TARGET_INPLACE_TRUE_DIVIDE,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&TARGET_STORE_MAP,
+	&&TARGET_INPLACE_ADD,
+	&&TARGET_INPLACE_SUBTRACT,
+	&&TARGET_INPLACE_MULTIPLY,
+	&&_unknown_opcode,
+	&&TARGET_INPLACE_MODULO,
+	&&TARGET_STORE_SUBSCR,
+	&&TARGET_DELETE_SUBSCR,
+	&&TARGET_BINARY_LSHIFT,
+	&&TARGET_BINARY_RSHIFT,
+	&&TARGET_BINARY_AND,
+	&&TARGET_BINARY_XOR,
+	&&TARGET_BINARY_OR,
+	&&TARGET_INPLACE_POWER,
+	&&TARGET_GET_ITER,
+	&&TARGET_STORE_LOCALS,
+	&&TARGET_PRINT_EXPR,
+	&&TARGET_LOAD_BUILD_CLASS,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&TARGET_INPLACE_LSHIFT,
+	&&TARGET_INPLACE_RSHIFT,
+	&&TARGET_INPLACE_AND,
+	&&TARGET_INPLACE_XOR,
+	&&TARGET_INPLACE_OR,
+	&&TARGET_BREAK_LOOP,
+	&&TARGET_WITH_CLEANUP,
+	&&_unknown_opcode,
+	&&TARGET_RETURN_VALUE,
+	&&TARGET_IMPORT_STAR,
+	&&_unknown_opcode,
+	&&TARGET_YIELD_VALUE,
+	&&TARGET_POP_BLOCK,
+	&&TARGET_END_FINALLY,
+	&&TARGET_POP_EXCEPT,
+	&&TARGET_STORE_NAME,
+	&&TARGET_DELETE_NAME,
+	&&TARGET_UNPACK_SEQUENCE,
+	&&TARGET_FOR_ITER,
+	&&TARGET_UNPACK_EX,
+	&&TARGET_STORE_ATTR,
+	&&TARGET_DELETE_ATTR,
+	&&TARGET_STORE_GLOBAL,
+	&&TARGET_DELETE_GLOBAL,
+	&&TARGET_DUP_TOPX,
+	&&TARGET_LOAD_CONST,
+	&&TARGET_LOAD_NAME,
+	&&TARGET_BUILD_TUPLE,
+	&&TARGET_BUILD_LIST,
+	&&TARGET_BUILD_SET,
+	&&TARGET_BUILD_MAP,
+	&&TARGET_LOAD_ATTR,
+	&&TARGET_COMPARE_OP,
+	&&TARGET_IMPORT_NAME,
+	&&TARGET_IMPORT_FROM,
+	&&TARGET_JUMP_FORWARD,
+	&&TARGET_JUMP_IF_FALSE,
+	&&TARGET_JUMP_IF_TRUE,
+	&&TARGET_JUMP_ABSOLUTE,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&TARGET_LOAD_GLOBAL,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&TARGET_CONTINUE_LOOP,
+	&&TARGET_SETUP_LOOP,
+	&&TARGET_SETUP_EXCEPT,
+	&&TARGET_SETUP_FINALLY,
+	&&_unknown_opcode,
+	&&TARGET_LOAD_FAST,
+	&&TARGET_STORE_FAST,
+	&&TARGET_DELETE_FAST,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&TARGET_RAISE_VARARGS,
+	&&TARGET_CALL_FUNCTION,
+	&&TARGET_MAKE_FUNCTION,
+	&&TARGET_BUILD_SLICE,
+	&&TARGET_MAKE_CLOSURE,
+	&&TARGET_LOAD_CLOSURE,
+	&&TARGET_LOAD_DEREF,
+	&&TARGET_STORE_DEREF,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&TARGET_CALL_FUNCTION_VAR,
+	&&TARGET_CALL_FUNCTION_KW,
+	&&TARGET_CALL_FUNCTION_VAR_KW,
+	&&TARGET_EXTENDED_ARG,
+	&&_unknown_opcode,
+	&&TARGET_LIST_APPEND,
+	&&TARGET_SET_ADD,
+	&&TARGET_MAP_ADD,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode,
+	&&_unknown_opcode
+};