From ec325cc785916c6a4991fe2e03747a97b7e1ae75 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= Date: Wed, 29 Sep 2010 12:16:56 +0200 Subject: BEAM loader: Combine is_type/1 and is_eq/1 instructions In the transformation engine in the loader, an is_eq/1 instruction is currently always preceded by an is_type/1 instruction. Therefore, save a word and slight amount of time by combining those instructions into an is_type_eq/2 instruction. --- erts/emulator/beam/beam_load.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'erts/emulator/beam') diff --git a/erts/emulator/beam/beam_load.c b/erts/emulator/beam/beam_load.c index feac89784b..73644ecfd6 100644 --- a/erts/emulator/beam/beam_load.c +++ b/erts/emulator/beam/beam_load.c @@ -3867,11 +3867,23 @@ transform_engine(LoaderState* st) if (i == 0) goto restart; break; +#if defined(TOP_is_eq) case TOP_is_eq: ASSERT(ap < instr->arity); if (*pc++ != instr->a[ap].val) goto restart; break; +#endif + case TOP_is_type_eq: + mask = *pc++; + + ASSERT(ap < instr->arity); + ASSERT(instr->a[ap].type < BEAM_NUM_TAGS); + if (((1 << instr->a[ap].type) & mask) == 0) + goto restart; + if (*pc++ != instr->a[ap].val) + goto restart; + break; case TOP_is_same_var: ASSERT(ap < instr->arity); i = *pc++; -- cgit v1.2.3