[Reduction] #42: Long shift right

libs/BorlandC/H_LRSH.ASM

@@ -0,0 +1,49 @@
+; *Not* the original file, but an edit to turn it into an includable slice.
+; Changes include:
+; * removal of RULES.ASI to eliminate redundancy
+; * removal of the 'CODE' segment declaration (for obvious reasons)
+
+;[]-----------------------------------------------------------------[]
+;|      H_LRSH.ASM -- long shift right                               |
+;[]-----------------------------------------------------------------[]
+
+;
+;       C/C++ Run Time Library - Version 5.0
+; 
+;       Copyright (c) 1987, 1992 by Borland International
+;       All Rights Reserved.
+; 
+
+        public  LXRSH@
+        public  F_LXRSH@
+        public  N_LXRSH@
+
+N_LXRSH@:
+        pop     bx                      ;fix up for far return
+        push    cs
+        push    bx
+LXRSH@:
+F_LXRSH@:
+        cmp     cl,16
+        jae     @@lsh@small
+        mov     bx,dx                   ; save the high bits
+        shr     ax,cl                   ; now shift each half
+        sar     dx,cl
+;
+;                       We now have a hole in AX where the lower bits of
+;                       DX should have been shifted.  So we must take our
+;                       copy of DX and do a reverse shift to get the proper
+;                       bits to be or'ed into AX.
+;
+        neg     cl
+        add     cl,16
+        shl     bx,cl
+        or      ax,bx
+        retf
+@@lsh@small:
+        sub     cl,16                   ; for shifts more than 15, do this
+                                        ; short sequence.
+        xchg    ax,dx                   ;
+        cwd                             ; We have now done a shift by 16.
+        sar     ax,cl                   ; Now shift the remainder.
+        retf

th01_zunsoft.asm

@@ -3816,37 +3816,7 @@ __c_exit	proc near
 		retn
 __c_exit	endp
 
-
+include libs/BorlandC/H_LRSH.ASM
-; =============== S U B	R O U T	I N E =======================================
-
-; Attributes: library function
-
-N_LXRSH@	proc far
-		pop	bx
-		push	cs
-		push	bx
-
-LXRSH@:
-		cmp	cl, 10h
-		jnb	short loc_17F0
-		mov	bx, dx
-		shr	ax, cl
-		sar	dx, cl
-		neg	cl
-		add	cl, 10h
-		shl	bx, cl
-		or	ax, bx
-		retf
-; ---------------------------------------------------------------------------
-
-loc_17F0:
-		sub	cl, 10h
-		xchg	ax, dx
-		cwd
-		sar	ax, cl
-		retf
-N_LXRSH@	endp ; sp-analysis failed
-
 include libs/BorlandC/__IOERROR.ASM
 include libs/BorlandC/_isatty.asm
 

th02_op.asm

@@ -7768,39 +7768,7 @@ _setvect	endp
 
 include libs/BorlandC/H_LDIV.ASM
 include libs/BorlandC/H_LLSH.ASM
-
+include libs/BorlandC/H_LRSH.ASM
-; ---------------------------------------------------------------------------
-
-N_LXRSH@:
-		pop	bx
-		push	cs
-		push	bx
-
-; =============== S U B	R O U T	I N E =======================================
-
-; Attributes: library function
-
-LXRSH@		proc far
-		cmp	cl, 10h
-		jnb	short loc_37A4
-		mov	bx, dx
-		shr	ax, cl
-		sar	dx, cl
-		neg	cl
-		add	cl, 10h
-		shl	bx, cl
-		or	ax, bx
-		retf
-; ---------------------------------------------------------------------------
-
-loc_37A4:
-		sub	cl, 10h
-		xchg	ax, dx
-		cwd
-		sar	ax, cl
-		retf
-LXRSH@		endp
-
 include libs/BorlandC/H_PADD.ASM
 include libs/BorlandC/__IOERROR.ASM
 include libs/BorlandC/_isatty.asm
@@ -25861,7 +25829,7 @@ loc_C124:
 		pop	bx
 		call	LXMUL@
 		mov	cl, 8
-		call	LXRSH@
+		call	far ptr LXRSH@
 		add	ax, [bp+arg_8]
 		mov	bx, [bp+var_2]
 		shl	bx, 2
@@ -25879,7 +25847,7 @@ loc_C124:
 		pop	bx
 		call	LXMUL@
 		mov	cl, 8
-		call	LXRSH@
+		call	far ptr LXRSH@
 		add	ax, [bp+arg_6]
 		mov	bx, [bp+var_2]
 		shl	bx, 2