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Made to work with troff

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This commit is contained in:
ceriel
1990-06-20 10:05:22 +00:00
parent 955002df6c
commit d3a17633aa
25 changed files with 583 additions and 456 deletions
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36
doc/ego/sr/sr2
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@@ -105,11 +105,11 @@ iv_expression * constant
.IP (2)
constant * iv_expression
.IP (3)
A[iv-expression] := (assign to array element)
A[iv-expression] := \kx(assign to array element)
.IP (4)
A[iv-expression] (use array element)
A[iv-expression] \h'|\nxu'(use array element)
.IP (5)
& A[iv-expression] (take address of array element)
& A[iv-expression] \h'|\nxu'(take address of array element)
.LP
(Note that EM has different instructions to use an array element,
store into one, or take the address of one, resp. LAR, SAR, and AAR).
@@ -171,10 +171,13 @@ replaced by TMP.
For array optimizations, the replacement
depends on the form:
.DS
\fIform\fR \fIreplacement\fR
(3) A[iv-expr] := *TMP := (assign indirect)
(4) A[iv-expr] *TMP (use indirect)
(5) &A[iv-expr] TMP
.TS
l l l.
\fIform\fR \fIreplacement\fR
(3) A[iv-expr] := *TMP := (assign indirect)
(4) A[iv-expr] *TMP (use indirect)
(5) &A[iv-expr] TMP
.TE
.DE
The '*' denotes the indirect operator. (Note that
EM has different instructions to do
@@ -199,14 +202,17 @@ must be negated.
.PP
The transformations are demonstrated by an example.
.DS
i := 100; i := 100;
while i > 1 loop TMP := (6-i) * 5;
X := (6-i) * 5 + 2; while i > 1 loop
Y := (6-i) * 5 - 8; --> X := TMP + 2;
i := i - 3; Y := TMP - 8;
end loop; i := i - 3;
TMP := TMP + 15;
end loop;
.TS
l l.
i := 100; i := 100;
while i > 1 loop TMP := (6-i) * 5;
X := (6-i) * 5 + 2; while i > 1 loop
Y := (6-i) * 5 - 8;\ \ \ \ \ \ \ --> X := TMP + 2;
i := i - 3; Y := TMP - 8;
end loop; i := i - 3;
TMP := TMP + 15;
end loop;
.TE
Fig. 6.2 Example of complex Strength Reduction transformations
.DE