Made to work with troff

doc/ego/sr/sr3

@@ -64,12 +64,15 @@ The assignment must match one of the EM patterns below.
 ('x' is the candidate. 'ws' is the word size of the target machine.
 'n' is any number.)
 .DS
-\fIpattern\fR                                     \fIstep size\fR
-INL x  |                                      +1
-DEL x  |                                      -1
-LOL x ; (INC | DEC) ; STL x  |                +1 | -1
-LOL x ; LOC n ; (ADI ws | SBI ws) ; STL x  |  +n | -n
-LOC n ; LOL x ; ADI ws ; STL x.               +n
+.TS
+l l.
+\fIpattern\fR	\fIstep size\fR
+INL x  |	+1
+DEL x  |	-1
+LOL x ; (INC | DEC) ; STL x  |	+1 | -1
+LOL x ; LOC n ; (ADI ws | SBI ws) ; STL x  |	+n | -n
+LOC n ; LOL x ; ADI ws ; STL x	+n
+.TE
 .DE
 From the patterns the step size of the induction variable
 can also be determined.
@@ -95,19 +98,22 @@ code in front of it.
 If an expression is to be optimized, it must
 be generated by the following syntax rules.
 .DS
-   optimizable_expr:
-		iv_expr const mult |
-		const iv_expr mult |
-		address iv_expr address array_instr;
-   mult:
-		MLI ws |
-		MLU ws ;
-   array_instr:
-		LAR ws |
-		SAR ws |
-		AAR ws ;
-   const:
-		LOC n ;
+.TS
+l l.
+optimizable_expr:
+	iv_expr const mult |
+	const iv_expr mult |
+	address iv_expr address array_instr;
+mult:
+	MLI ws |
+	MLU ws ;
+array_instr:
+	LAR ws |
+	SAR ws |
+	AAR ws ;
+const:
+	LOC n ;
+.TE
 .DE
 An 'address' is an EM instruction that loads an
 address on the stack.
@@ -120,36 +126,42 @@ instructions like LDL are an 'address'.
 denote resp. the array address and the
 array descriptor address).
 .DS
-   address:
-		LAE |
-		LAL |
-		LOL if ps=ws |
-		LOE    ,,    |
-		LIL    ,,    |
-		LDL if ps=2*ws |
-		LDE    ,,      ;
+.TS
+l l.
+address:
+	LAE |
+	LAL |
+	LOL if ps=ws |
+	LOE    ,,    |
+	LIL    ,,    |
+	LDL if ps=2*ws |
+	LDE    ,,      ;
+.TE
 .DE
 The notion of an iv-expression was introduced earlier.
 .DS
-   iv_expr:
-		iv_expr unair_op |
-		iv_expr iv_expr binary_op |
-		loopconst |
-		iv ;
-   unair_op:
-		NGI ws |
-		INC |
-		DEC ;
-   binary_op:
-		ADI ws |
-		ADU ws |
-		SBI ws |
-		SBU ws ;
-   loopconst:
-		const |
-		LOL x  if x is not changed in loop ;
-   iv:
-		LOL x  if x is an induction variable ;
+.TS
+l l.
+iv_expr:
+	iv_expr unair_op |
+	iv_expr iv_expr binary_op |
+	loopconst |
+	iv ;
+unair_op:
+	NGI ws |
+	INC |
+	DEC ;
+binary_op:
+	ADI ws |
+	ADU ws |
+	SBI ws |
+	SBU ws ;
+loopconst:
+	const |
+	LOL x  if x is not changed in loop ;
+iv:
+	LOL x  if x is an induction variable ;
+.TE
 .DE
 An iv_expression must satisfy one additional constraint:
 it must use exactly one operand that is an induction