paweld/fpc
1
0
Fork 0
mirror of https://gitlab.com/freepascal.org/fpc/source.git synced 2025-08-19 04:09:20 +02:00
Code Issues Packages Projects Releases Wiki Activity

* arm cond. instruction support

Browse Source 
git-svn-id: trunk@5387 -
This commit is contained in:
florian 2006-11-14 22:37:22 +00:00
parent ee52cd44e1
commit 4010d66c2c
3 changed files with 162 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
compiler/aopt.pas
View File

@ -229,7 +229,7 @@ Unit aopt;
{ CSE;}
End;
{ more peephole optimizations }
{ PeepHoleOptPass2;}
PeepHoleOptPass2;
{ if pass = last_pass then }
PostPeepHoleOpts;
{ free memory }

2
compiler/aoptobj.pas
View File

@ -288,7 +288,7 @@ Unit AoptObj;
{ peephole optimizer }
procedure PrePeepHoleOpts;
procedure PeepHoleOptPass1;
procedure PeepHoleOptPass2;
procedure PeepHoleOptPass2; virtual;
procedure PostPeepHoleOpts;
{ processor dependent methods }

160
compiler/arm/aoptcpu.pas
View File

@ -33,10 +33,170 @@ uses cpubase, aopt, aoptcpub;
Type
TCpuAsmOptimizer = class(TAsmOptimizer)
{ uses the same constructor as TAopObj }
procedure PeepHoleOptPass2;override;
End;
Implementation
uses
aasmbase,aasmtai,aasmcpu;
function CanBeCond(p : tai) : boolean;
begin
result:=true;
end;
procedure TCpuAsmOptimizer.PeepHoleOptPass2;
var
p,hp1,hp2: tai;
l : longint;
condition : tasmcond;
hp3: tai;
{ UsedRegs, TmpUsedRegs: TRegSet; }
begin
exit; { deactived, not working yet FK }
p := BlockStart;
{ UsedRegs := []; }
while (p <> BlockEnd) Do
begin
{ UpdateUsedRegs(UsedRegs, tai(p.next)); }
case p.Typ Of
Ait_Instruction:
begin
case taicpu(p).opcode Of
A_B:
if taicpu(p).condition<>C_None then
begin
{ check for
Bxx xxx
<several instructions>
xxx:
}
l:=0;
GetNextInstruction(p, hp1);
while assigned(hp1) and
(l<=4) and
CanBeCond(hp1) and
{ stop on labels }
not(hp1.typ=ait_label) do
begin
inc(l);
GetNextInstruction(hp1,hp1);
end;
if assigned(hp1) then
begin
if FindLabel(tasmlabel(taicpu(p).oper[0]^.ref^.symbol),hp1) then
begin
if (l<=4) and (l>0) then
begin
condition:=inverse_cond(taicpu(p).condition);
hp2:=p;
GetNextInstruction(p,hp1);
p:=hp1;
repeat
if hp1.typ=ait_instruction then
taicpu(hp1).condition:=condition;
GetNextInstruction(hp1,hp1);
until not(assigned(hp1)) or
not(CanBeCond(hp1)) or
(hp1.typ=ait_label);
{ wait with removing else GetNextInstruction could
ignore the label if it was the only usage in the
jump moved away }
tasmlabel(taicpu(hp2).oper[0]^.ref^.symbol).decrefs;
asml.remove(hp2);
hp2.free;
continue;
end;
end
else
begin
{ check further for
Bcc xxx
<several movs 1>
B yyy
xxx:
<several movs 2>
yyy:
}
{ hp2 points to jmp yyy }
hp2:=hp1;
{ skip hp1 to xxx }
GetNextInstruction(hp1, hp1);
if assigned(hp2) and
assigned(hp1) and
(l<=3) and
(hp2.typ=ait_instruction) and
(taicpu(hp2).is_jmp) and
(taicpu(hp2).condition=C_None) and
{ real label and jump, no further references to the
label are allowed }
(tasmlabel(taicpu(p).oper[0]^.ref^.symbol).getrefs=2) and
FindLabel(tasmlabel(taicpu(p).oper[0]^.ref^.symbol),hp1) then
begin
l:=0;
{ skip hp1 to <several moves 2> }
GetNextInstruction(hp1, hp1);
while assigned(hp1) and
CanBeCond(hp1) do
begin
inc(l);
GetNextInstruction(hp1, hp1);
end;
{ hp1 points to yyy: }
if assigned(hp1) and
FindLabel(tasmlabel(taicpu(hp2).oper[0]^.ref^.symbol),hp1) then
begin
condition:=inverse_cond(taicpu(p).condition);
GetNextInstruction(p,hp1);
hp3:=p;
p:=hp1;
repeat
if hp1.typ=ait_instruction then
taicpu(hp1).condition:=condition;
GetNextInstruction(hp1,hp1);
until not(assigned(hp1)) or
not(CanBeCond(hp1));
{ hp2 is still at jmp yyy }
GetNextInstruction(hp2,hp1);
{ hp2 is now at xxx: }
condition:=inverse_cond(condition);
GetNextInstruction(hp1,hp1);
{ hp1 is now at <several movs 2> }
repeat
taicpu(hp1).condition:=condition;
GetNextInstruction(hp1,hp1);
until not(assigned(hp1)) or
not(CanBeCond(hp1)) or
(hp1.typ=ait_label);
{
asml.remove(hp1.next)
hp1.next.free;
asml.remove(hp1);
hp1.free;
}
{ remove Bcc }
tasmlabel(taicpu(hp3).oper[0]^.ref^.symbol).decrefs;
asml.remove(hp3);
hp3.free;
{ remove jmp }
tasmlabel(taicpu(hp2).oper[0]^.ref^.symbol).decrefs;
asml.remove(hp2);
hp2.free;
continue;
end;
end;
end;
end;
end;
end;
end;
end;
p := tai(p.next)
end;
end;
begin
casmoptimizer:=TCpuAsmOptimizer;
End.