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| author | dkf <donal.k.fellows@manchester.ac.uk> | 2010-04-30 08:29:40 (GMT) |
|---|---|---|
| committer | dkf <donal.k.fellows@manchester.ac.uk> | 2010-04-30 08:29:40 (GMT) |
| commit | 24e16718fb60e1a29dfe2c5c6f0a240de327f172 (patch) | |
| tree | 239c39aa5e3e914869f4b0f2c08bb67c2b7cebe8 /generic/tclExecute.c | |
| parent | fef563336c6dc5ae1b57a63431daf9ed77de8f27 (diff) | |
| download | tcl-24e16718fb60e1a29dfe2c5c6f0a240de327f172.zip tcl-24e16718fb60e1a29dfe2c5c6f0a240de327f172.tar.gz tcl-24e16718fb60e1a29dfe2c5c6f0a240de327f172.tar.bz2 | |
* generic/tclExecute.c (TclExecuteByteCode): Add peephole optimization
of the fact that INST_DICT_FIRST and INST_DICT_NEXT always have a
conditional jump afterwards.
Diffstat (limited to 'generic/tclExecute.c')
| -rw-r--r-- | generic/tclExecute.c | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/generic/tclExecute.c b/generic/tclExecute.c index 04c47f4..d6dd352 100644 --- a/generic/tclExecute.c +++ b/generic/tclExecute.c @@ -14,7 +14,7 @@ * See the file "license.terms" for information on usage and redistribution of * this file, and for a DISCLAIMER OF ALL WARRANTIES. * - * RCS: @(#) $Id: tclExecute.c,v 1.481 2010/04/28 11:50:53 nijtmans Exp $ + * RCS: @(#) $Id: tclExecute.c,v 1.482 2010/04/30 08:29:40 dkf Exp $ */ #include "tclInt.h" @@ -6088,6 +6088,31 @@ TclExecuteByteCode( PUSH_OBJECT(valuePtr); PUSH_OBJECT(keyPtr); } + +#ifndef TCL_COMPILE_DEBUG + /* + * The INST_DICT_FIRST and INST_DICT_NEXT instructsions are always + * followed by a conditional jump, so we can take advantage of this to + * do some peephole optimization (note that we're careful to not close + * out someone doing something else). + */ + + pc += 5; + switch (*pc) { + case INST_JUMP_FALSE1: + NEXT_INST_F((done ? 2 : TclGetInt1AtPtr(pc+1)), 0, 0); + case INST_JUMP_FALSE4: + NEXT_INST_F((done ? 5 : TclGetInt4AtPtr(pc+1)), 0, 0); + case INST_JUMP_TRUE1: + NEXT_INST_F((done ? TclGetInt1AtPtr(pc+1) : 2), 0, 0); + case INST_JUMP_TRUE4: + NEXT_INST_F((done ? TclGetInt4AtPtr(pc+1) : 5), 0, 0); + default: + pc -= 5; + /* fall through to non-debug handling */ + } +#endif + TRACE_APPEND(("\"%.30s\" \"%.30s\" %d", O2S(OBJ_UNDER_TOS), O2S(OBJ_AT_TOS), done)); objResultPtr = TCONST(done); |