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* improve ShlAddLeaSubIncDec2Lea to take care of foldable LEAs

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git-svn-id: trunk@43453 -
This commit is contained in:
florian 2019-11-11 22:08:17 +00:00
parent 83a11c2a7d
commit 1d6e719e38
1 changed files with 28 additions and 5 deletions
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33
compiler/x86/aoptx86.pas
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@ -2594,12 +2594,34 @@ unit aoptx86;
(((taicpu(hp1).opcode = A_INC) or
(taicpu(hp1).opcode = A_DEC)) and
(taicpu(hp1).oper[0]^.typ = Top_Reg) and
(taicpu(hp1).oper[0]^.reg = taicpu(p).oper[1]^.reg))) and
(taicpu(hp1).oper[0]^.reg = taicpu(p).oper[1]^.reg)) or
((taicpu(hp1).opcode = A_LEA) and
(taicpu(hp1).oper[0]^.ref^.index = taicpu(p).oper[1]^.reg) and
(taicpu(hp1).oper[1]^.reg = taicpu(p).oper[1]^.reg))) and
(not GetNextInstruction(hp1,hp2) or
not instrReadsFlags(hp2)) Do
begin
TmpBool1 := False;
if (taicpu(hp1).oper[0]^.typ = Top_Const) then
if taicpu(hp1).opcode=A_LEA then
begin
if (TmpRef.base = NR_NO) and
(taicpu(hp1).oper[0]^.ref^.symbol=nil) and
(taicpu(hp1).oper[0]^.ref^.relsymbol=nil) and
(taicpu(hp1).oper[0]^.ref^.segment=NR_NO) and
((taicpu(hp1).oper[0]^.ref^.scalefactor=0) or
(taicpu(hp1).oper[0]^.ref^.scalefactor*tmpref.scalefactor<=8)) then
begin
TmpBool1 := True;
TmpBool2 := True;
inc(TmpRef.offset, taicpu(hp1).oper[0]^.ref^.offset);
if taicpu(hp1).oper[0]^.ref^.scalefactor<>0 then
tmpref.scalefactor:=tmpref.scalefactor*taicpu(hp1).oper[0]^.ref^.scalefactor;
TmpRef.base := taicpu(hp1).oper[0]^.ref^.base;
asml.remove(hp1);
hp1.free;
end
end
else if (taicpu(hp1).oper[0]^.typ = Top_Const) then
begin
TmpBool1 := True;
TmpBool2 := True;
@ -2647,14 +2669,15 @@ unit aoptx86;
then
begin
if not(TmpBool2) and
(taicpu(p).oper[0]^.val = 1) then
(taicpu(p).oper[0]^.val=1) then
begin
hp1 := taicpu.Op_reg_reg(A_ADD,taicpu(p).opsize,
hp1:=taicpu.Op_reg_reg(A_ADD,taicpu(p).opsize,
taicpu(p).oper[1]^.reg, taicpu(p).oper[1]^.reg)
end
else
hp1 := taicpu.op_ref_reg(A_LEA, taicpu(p).opsize, TmpRef,
hp1:=taicpu.op_ref_reg(A_LEA, taicpu(p).opsize, TmpRef,
taicpu(p).oper[1]^.reg);
DebugMsg(SPeepholeOptimization + 'ShlAddLeaSubIncDec2Lea',p);
InsertLLItem(p.previous, p.next, hp1);
p.free;
p := hp1;