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m68k: implemented a simple a_cmp_const_ref_label. uses TST instruction to test ref contents against zero

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git-svn-id: trunk@28053 -
This commit is contained in:
Károly Balogh 2014-06-25 06:56:58 +00:00
parent c79cd3beca
commit 531ac093ed
1 changed files with 22 additions and 0 deletions
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22
compiler/m68k/cgcpu.pas
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@ -72,6 +72,7 @@ unit cgcpu;
procedure a_op_reg_ref(list : TAsmList; Op: TOpCG; size: TCGSize; reg: TRegister; const ref: TReference); override;
procedure a_cmp_const_reg_label(list : TAsmList;size : tcgsize;cmp_op : topcmp;a : tcgint;reg : tregister; l : tasmlabel);override;
procedure a_cmp_const_ref_label(list : TAsmList;size : tcgsize;cmp_op : topcmp;a : tcgint;const ref : treference; l : tasmlabel); override;
procedure a_cmp_reg_reg_label(list : TAsmList;size : tcgsize;cmp_op : topcmp;reg1,reg2 : tregister;l : tasmlabel); override;
procedure a_jmp_name(list : TAsmList;const s : string); override;
procedure a_jmp_always(list : TAsmList;l: tasmlabel); override;
@ -1442,6 +1443,27 @@ unit cgcpu;
a_jmp_cond(list,cmp_op,l);
end;
procedure tcg68k.a_cmp_const_ref_label(list : TAsmList;size : tcgsize;cmp_op : topcmp;a : tcgint;const ref : treference; l : tasmlabel);
var
tmpref: treference;
begin
{ optimize for usage of TST here, so ref compares against zero, which is the
most common case by far in the RTL code at least (KB) }
if (a = 0) then
begin
//list.concat(tai_comment.create(strpnew('a_cmp_const_ref_label with TST')));
tmpref:=ref;
fixref(list,tmpref);
list.concat(taicpu.op_ref(A_TST,tcgsize2opsize[size],tmpref));
a_jmp_cond(list,cmp_op,l);
end
else
begin
//list.concat(tai_comment.create(strpnew('a_cmp_const_ref_label inherited')));
inherited;
end;
end;
procedure tcg68k.a_cmp_reg_reg_label(list : TAsmList;size : tcgsize;cmp_op : topcmp;reg1,reg2 : tregister;l : tasmlabel);
begin
list.concat(taicpu.op_reg_reg(A_CMP,tcgsize2opsize[size],reg1,reg2));