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Generate better code for some floating-point and long long constants.

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We now recognize cases where the same value needs to be pushed for several consecutive words, so it is more efficient to load it into a register and push that rather than just using PEA instructions.
This commit is contained in:
Stephen Heumann 2023-04-02 19:39:03 -05:00
parent 4e5e622903
commit 74cec68dac
1 changed files with 47 additions and 23 deletions
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70
Gen.pas
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@ -6162,17 +6162,50 @@ procedure GenTree {op: icptr};
{ Generate code for a pc_ldc }
type
kind = (vint, vbyte); {kinds of equivalenced data}
var
i: integer; {loop/index variable}
rec: realrec; {conversion record}
switch: packed record {used for type conversion}
case rkind: kind of
vint: (i: integer);
vbyte: (b1, b2, b3, b4, b5, b6, b7, b8: byte);
kind = (vreal, vlonglong, vwords); {kinds of equivalenced data}
switchRec = packed record
case kind of
vreal: (theReal: extended);
vlonglong: (theLonglong: longlong);
vwords: (words: packed array[1..5] of integer);
end;
var
switch: switchRec; {used for type conversion}
procedure PushWords (switch: switchRec; count: integer);
{ Generate code to push words from the switch record }
{ }
{ parameters }
{ switch - the switch record }
{ count - number of words to push }
var
val: integer; {word value to push}
begin {PushWords}
repeat
val := switch.words[count];
if (count >= 3)
and (switch.words[count-1] = val)
and (switch.words[count-2] = val)
then begin
GenNative(m_lda_imm, immediate, val, nil, 0);
repeat
GenImplied(m_pha);
count := count - 1;
until (count = 0) or (switch.words[count] <> val);
end {if}
else begin
GenNative(m_pea, immediate, val, nil, 0);
count := count - 1;
end; {else}
until count = 0;
end; {PushWords}
begin {GenLdc}
case op^.optype of
cgByte: begin
@ -6185,15 +6218,8 @@ procedure GenTree {op: icptr};
GenNative(m_lda_imm, immediate, op^.q, nil, 0);
cgReal, cgDouble, cgComp, cgExtended: begin
rec.itsReal := op^.rval;
CnvSX(rec);
i := 9;
while i >= 0 do begin
switch.b1 := rec.inSANE[i];
switch.b2 := rec.inSANE[i+1];
GenNative(m_pea, immediate, switch.i, nil, 0);
i := i-2;
end; {while}
switch.theReal := op^.rval;
PushWords(switch, 5);
end;
cgLong, cgULong:
@ -6214,10 +6240,8 @@ procedure GenTree {op: icptr};
cgQuad,cgUQuad: begin
if gQuad.preference = onStack then begin
GenNative(m_pea, immediate, long(op^.qval.hi).msw, nil, 0);
GenNative(m_pea, immediate, long(op^.qval.hi).lsw, nil, 0);
GenNative(m_pea, immediate, long(op^.qval.lo).msw, nil, 0);
GenNative(m_pea, immediate, long(op^.qval.lo).lsw, nil, 0);
switch.theLonglong := op^.qval;
PushWords(switch, 4);
end {if}
else begin
GenNative(m_lda_imm, immediate, long(op^.qval.hi).msw, nil, 0);