diff options
Diffstat (limited to 'generic/tclExecute.c')
| -rw-r--r-- | generic/tclExecute.c | 59 |
1 files changed, 34 insertions, 25 deletions
diff --git a/generic/tclExecute.c b/generic/tclExecute.c index daa560c..6182a51 100644 --- a/generic/tclExecute.c +++ b/generic/tclExecute.c @@ -11,7 +11,7 @@ * 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 1.124 2004/04/06 22:25:50 dgp Exp $ + * RCS: @(#) $Id: tclExecute.c,v 1.125 2004/05/12 17:43:55 msofer Exp $ */ #include "tclInt.h" @@ -1239,29 +1239,6 @@ TclExecuteByteCode(interp, codePtr) } switch (*pc) { - case INST_START_CMD: - if ((!(iPtr->flags & DELETED) - && (codeCompileEpoch == iPtr->compileEpoch) - && (codeNsEpoch == namespacePtr->resolverEpoch)) - || codePrecompiled) { - NEXT_INST_F(5, 0, 0); - } else { - bytes = GetSrcInfoForPc(pc, codePtr, &length); - result = Tcl_EvalEx(interp, bytes, length, 0); - if (result != TCL_OK) { - goto checkForCatch; - } - opnd = TclGetUInt4AtPtr(pc+1); - objResultPtr = Tcl_GetObjResult(interp); - { - Tcl_Obj *newObjResultPtr; - TclNewObj(newObjResultPtr); - Tcl_IncrRefCount(newObjResultPtr); - iPtr->objResultPtr = newObjResultPtr; - } - NEXT_INST_V(opnd, 0, -1); - } - case INST_RETURN: { int code = TclGetInt4AtPtr(pc+1); @@ -1319,7 +1296,39 @@ TclExecuteByteCode(interp, codePtr) TRACE_WITH_OBJ(("=> discarding "), *tosPtr); valuePtr = POP_OBJECT(); TclDecrRefCount(valuePtr); - NEXT_INST_F(1, 0, 0); + + /* + * Runtime peephole optimisation: an INST_POP is scheduled + * at the end of most commands. If the next instruction is an + * INST_START_CMD, fall through to it. + */ + pc++; + if (*pc != INST_START_CMD) { + NEXT_INST_F(0, 0, 0); + } + + case INST_START_CMD: + if ((!(iPtr->flags & DELETED) + && (codeCompileEpoch == iPtr->compileEpoch) + && (codeNsEpoch == namespacePtr->resolverEpoch)) + || codePrecompiled) { + NEXT_INST_F(5, 0, 0); + } else { + bytes = GetSrcInfoForPc(pc, codePtr, &length); + result = Tcl_EvalEx(interp, bytes, length, 0); + if (result != TCL_OK) { + goto checkForCatch; + } + opnd = TclGetUInt4AtPtr(pc+1); + objResultPtr = Tcl_GetObjResult(interp); + { + Tcl_Obj *newObjResultPtr; + TclNewObj(newObjResultPtr); + Tcl_IncrRefCount(newObjResultPtr); + iPtr->objResultPtr = newObjResultPtr; + } + NEXT_INST_V(opnd, 0, -1); + } case INST_DUP: objResultPtr = *tosPtr; |