diff options
Diffstat (limited to 'generic/tclCompExpr.c')
| -rw-r--r-- | generic/tclCompExpr.c | 16 |
1 files changed, 6 insertions, 10 deletions
diff --git a/generic/tclCompExpr.c b/generic/tclCompExpr.c index 3fc5004..1f89603 100644 --- a/generic/tclCompExpr.c +++ b/generic/tclCompExpr.c @@ -9,7 +9,7 @@ * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. * - * RCS: @(#) $Id: tclCompExpr.c,v 1.20 2004/01/12 18:21:08 msofer Exp $ + * RCS: @(#) $Id: tclCompExpr.c,v 1.21 2004/01/12 18:50:15 msofer Exp $ */ #include "tclInt.h" @@ -632,19 +632,15 @@ CompileLandOrLorExpr(exprTokenPtr, opIndex, infoPtr, envPtr, endPtrPtr) tokenPtr += (tokenPtr->numComponents + 1); /* - * If the second operand has the same boolean value as the first, - * jump to the short-circuit target. + * The result is the boolean value of the second operand. We + * code this in a somewhat contorted manner to be able to reuse + * the shortCircuit value and save one INST_JUMP. */ TclEmitForwardJump(envPtr, ((opIndex==OP_LAND)? TCL_FALSE_JUMP : TCL_TRUE_JUMP), &shortCircuitFixup2); - /* - * Push the boolean value of the second operand, jump to the end. - */ - - if (opIndex == OP_LAND) { TclEmitPush(TclRegisterNewLiteral(envPtr, "1", 1), envPtr); } else { @@ -653,14 +649,14 @@ CompileLandOrLorExpr(exprTokenPtr, opIndex, infoPtr, envPtr, endPtrPtr) TclEmitForwardJump(envPtr, TCL_UNCONDITIONAL_JUMP, &endFixup); /* - * Fixup the short-circuit jumps and push the correct boolean. + * Fixup the short-circuit jumps and push the shortCircuit value. * Note that shortCircuitFixup2 is always a short jump. */ TclFixupForwardJumpToHere(envPtr, &shortCircuitFixup2, 127); if (TclFixupForwardJumpToHere(envPtr, &shortCircuitFixup, 127)) { /* - * Short-circuit jump grown by 3 bytes: update endFixup. + * shortCircuit jump grown by 3 bytes: update endFixup. */ endFixup.codeOffset += 3; |