From 78fcaa358001767a51161316acbc429666bf86dd Mon Sep 17 00:00:00 2001
From: Miguel Sofer <miguel.sofer@gmail.com>
Date: Sat, 27 Sep 2014 21:36:06 +0000
Subject: Backing out commit [cddbfc3081], fix for bug [82521bfb6734f891dd]

The "optimisation" in that commit assumes that the last byte in the
generated bytecodes is an INST_TRY_CONVERT if it equals 64. This is an
invalid assumption, it could be 64 and not be an instruction.
---
 generic/tclCompCmds.c   |  1 -
 generic/tclCompCmdsGR.c |  2 --
 generic/tclCompCmdsSZ.c |  1 -
 generic/tclCompile.h    | 12 ------------
 4 files changed, 16 deletions(-)

diff --git a/generic/tclCompCmds.c b/generic/tclCompCmds.c
index 431f0af..496d44f 100644
--- a/generic/tclCompCmds.c
+++ b/generic/tclCompCmds.c
@@ -2401,7 +2401,6 @@ TclCompileForCmd(
 
     SetLineInformation(2);
     TclCompileExprWords(interp, testTokenPtr, 1, envPtr);
-    TclClearNumConversion(envPtr);
 
     jumpDist = CurrentOffset(envPtr) - bodyCodeOffset;
     if (jumpDist > 127) {
diff --git a/generic/tclCompCmdsGR.c b/generic/tclCompCmdsGR.c
index 603c51d..9d258fc 100644
--- a/generic/tclCompCmdsGR.c
+++ b/generic/tclCompCmdsGR.c
@@ -281,7 +281,6 @@ TclCompileIfCmd(
 		SetLineInformation(wordIdx);
 		Tcl_ResetResult(interp);
 		TclCompileExprWords(interp, testTokenPtr, 1, envPtr);
-		TclClearNumConversion(envPtr);
 		if (jumpFalseFixupArray.next >= jumpFalseFixupArray.end) {
 		    TclExpandJumpFixupArray(&jumpFalseFixupArray);
 		}
@@ -531,7 +530,6 @@ TclCompileIncrCmd(
 	} else {
 	    SetLineInformation(2);
 	    CompileTokens(envPtr, incrTokenPtr, interp);
-	    TclClearNumConversion(envPtr);
 	}
     } else {			/* No incr amount given so use 1. */
 	haveImmValue = 1;
diff --git a/generic/tclCompCmdsSZ.c b/generic/tclCompCmdsSZ.c
index 617a520..382d2d1 100644
--- a/generic/tclCompCmdsSZ.c
+++ b/generic/tclCompCmdsSZ.c
@@ -3782,7 +3782,6 @@ TclCompileWhileCmd(
 	}
 	SetLineInformation(1);
 	TclCompileExprWords(interp, testTokenPtr, 1, envPtr);
-	TclClearNumConversion(envPtr);
 
 	jumpDist = CurrentOffset(envPtr) - bodyCodeOffset;
 	if (jumpDist > 127) {
diff --git a/generic/tclCompile.h b/generic/tclCompile.h
index 01b78d9..51f0b34 100644
--- a/generic/tclCompile.h
+++ b/generic/tclCompile.h
@@ -1414,18 +1414,6 @@ MODULE_SCOPE int	TclPushProcCallFrame(ClientData clientData,
     } while (0)
 
 /*
- * If the expr compiler finished with TRY_CONVERT, macro to remove it when the
- * job is done by the following instruction.
- */
-
-#define TclClearNumConversion(envPtr) \
-    do {								\
-	if (*(envPtr->codeNext - 1) == INST_TRY_CVT_TO_NUMERIC) {	\
-	    envPtr->codeNext--;						\
-	}								\
-    } while (0)
-
-/*
  * Macros to update a (signed or unsigned) integer starting at a pointer. The
  * two variants depend on the number of bytes. The ANSI C "prototypes" for
  * these macros are:
-- 
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