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+ optimize some slwi/rlwinm combos

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git-svn-id: trunk@1378 -
This commit is contained in:
Jonas Maebe 2005-10-14 21:03:48 +00:00
parent 9cf0865d0e
commit 4558cd705e
1 changed files with 21 additions and 0 deletions
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21
compiler/powerpc/aoptcpu.pas
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@ -122,6 +122,27 @@ const
result := true; result := true;
end; end;
end; end;
A_SLWI:
begin
if getnextinstruction(p,next1) and
(next1.typ = ait_instruction) and
(taicpu(next1).opcode = A_RLWINM) and
(taicpu(next1).oper[0]^.reg = taicpu(p).oper[0]^.reg) and
(taicpu(next1).oper[1]^.reg = taicpu(p).oper[0]^.reg) then
begin
if (taicpu(next1).oper[2]^.val = 0) then
begin
{ convert slwi to rlwinm and see if the rlwinm }
{ optimization can do something with it }
taicpu(p).opcode := A_RLWINM;
taicpu(p).ops := 5;
taicpu(p).loadconst(2,taicpu(p).oper[2]^.val);
taicpu(p).loadconst(3,0);
taicpu(p).loadconst(4,31-taicpu(p).oper[2]^.val);
result := true;
end;
end;
end;
A_SRWI: A_SRWI:
begin begin
if getnextinstruction(p,next1) and if getnextinstruction(p,next1) and