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+ MIPS: implemented more peephole optimizations.

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git-svn-id: trunk@28536 -
This commit is contained in:
sergei 2014-08-29 18:20:49 +00:00
parent d9a7d28838
commit 1e11e34f42
1 changed files with 123 additions and 2 deletions
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125
compiler/mips/aoptcpu.pas
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@ -28,15 +28,19 @@ unit aoptcpu;
Interface
uses
cgbase, cpubase, aoptobj, aoptcpub, aopt, aasmtai;
cgbase, cpubase, aoptobj, aoptcpub, aopt, aasmtai, aasmcpu;
Type
TAsmOpSet = set of TAsmOp;
TCpuAsmOptimizer = class(TAsmOptimizer)
function RegModifiedByInstruction(Reg: TRegister; p1: tai): boolean; override;
function GetNextInstructionUsingReg(Current: tai;
var Next: tai; reg: TRegister): Boolean;
function RegUsedAfterInstruction(reg: Tregister; p: tai;
var AllUsedRegs: TAllUsedRegs): Boolean;
function TryRemoveMov(var p: tai; opcode: TAsmOp): boolean;
function TryRemoveMovBeforeStore(var p: tai; next: taicpu; const storeops: TAsmOpSet): boolean;
function PeepHoleOptPass1Cpu(var p: tai): boolean; override;
procedure PeepHoleOptPass2; override;
End;
@ -44,7 +48,7 @@ unit aoptcpu;
Implementation
uses
globals,aasmbase,aasmcpu,cpuinfo,verbose;
globals,aasmbase,cpuinfo,verbose;
function MatchInstruction(const instr: tai; const op: TAsmOp): boolean;
@ -170,6 +174,20 @@ unit aoptcpu;
end;
function TCpuAsmOptimizer.RegModifiedByInstruction(Reg: TRegister; p1: tai): boolean;
var
i : Longint;
begin
result:=false;
for i:=0 to taicpu(p1).ops-1 do
if (taicpu(p1).oper[i]^.typ=top_reg) and (taicpu(p1).oper[i]^.reg=Reg) and (taicpu(p1).spilling_get_operation_type(i) in [operand_write,operand_readwrite]) then
begin
result:=true;
exit;
end;
end;
function TCpuAsmOptimizer.GetNextInstructionUsingReg(Current: tai;
var Next: tai; reg: TRegister): Boolean;
begin
@ -261,6 +279,23 @@ unit aoptcpu;
end;
function TCpuAsmOptimizer.TryRemoveMovBeforeStore(var p: tai; next: taicpu; const storeops: TAsmOpSet): boolean;
begin
result:=(next.opcode in storeops) and
MatchOperand(next.oper[0]^,taicpu(p).oper[0]^.reg) and
{ Ry cannot be modified between move and store }
(not RegModifiedBetween(taicpu(p).oper[1]^.reg,p,next)) and
Assigned(FindRegDealloc(taicpu(p).oper[0]^.reg,tai(next.next)));
if result then
begin
next.loadreg(0,taicpu(p).oper[1]^.reg);
asml.remove(p);
p.free;
p:=next;
end;
end;
function TCpuAsmOptimizer.PeepHoleOptPass1Cpu(var p: tai): boolean;
var
next,next2: tai;
@ -385,6 +420,92 @@ unit aoptcpu;
TryRemoveMov(p,A_MOVE);
end;
A_MOV_S:
begin
if GetNextInstructionUsingReg(p,next,taicpu(p).oper[0]^.reg) and
(next.typ=ait_instruction) then
begin
if TryRemoveMovBeforeStore(p,taicpu(next),[A_SWC1]) then
{ optimization successful };
end;
end;
A_MOV_D:
begin
if GetNextInstructionUsingReg(p,next,taicpu(p).oper[0]^.reg) and
(next.typ=ait_instruction) then
begin
if TryRemoveMovBeforeStore(p,taicpu(next),[A_SDC1]) then
{ optimization successful };
end;
end;
A_MOVE:
begin
if GetNextInstructionUsingReg(p,next,taicpu(p).oper[0]^.reg) and
(next.typ=ait_instruction) then
begin
{ MOVE Rx,Ry; store Rx,(ref); dealloc Rx ==> store Ry,(ref) }
if TryRemoveMovBeforeStore(p,taicpu(next),[A_SB,A_SH,A_SW]) then
{ optimization successful }
{ MOVE Rx,Ry; opcode Rx,Rx,any ==> opcode Rx,Ry,any
MOVE Rx,Ry; opcode Rx,Rz,Rx ==> opcode Rx,Rz,Ry }
else if (taicpu(next).opcode in [A_ADD,A_ADDU,A_ADDI,A_ADDIU,A_SUB,A_SUBU]) and
MatchOperand(taicpu(next).oper[0]^,taicpu(p).oper[0]^.reg) and
(not RegModifiedBetween(taicpu(p).oper[1]^.reg,p,next)) then
begin
if MatchOperand(taicpu(next).oper[1]^,taicpu(p).oper[0]^.reg) then
begin
taicpu(next).loadreg(1,taicpu(p).oper[1]^.reg);
asml.remove(p);
p.free;
p:=next;
end
{ TODO: if Ry=NR_R0, this effectively changes instruction into MOVE,
providing further optimization possibilities }
else if MatchOperand(taicpu(next).oper[2]^,taicpu(p).oper[0]^.reg) then
begin
taicpu(next).loadreg(2,taicpu(p).oper[1]^.reg);
asml.remove(p);
p.free;
p:=next;
end;
end
{ MOVE Rx,Ry; opcode Rz,Rx,any; dealloc Rx ==> opcode Rz,Ry,any }
else if (taicpu(next).opcode in [A_ADD,A_ADDU,A_ADDI,A_ADDIU,A_SUB,A_SUBU,A_SLT,A_SLTU]) and
MatchOperand(taicpu(next).oper[1]^,taicpu(p).oper[0]^.reg) and
(not RegModifiedBetween(taicpu(p).oper[1]^.reg,p,next)) and
Assigned(FindRegDealloc(taicpu(p).oper[0]^.reg,tai(next.next))) then
begin
taicpu(next).loadreg(1,taicpu(p).oper[1]^.reg);
asml.remove(p);
p.free;
p:=next;
end
{ MULT[U] must be handled separately }
else if (taicpu(next).opcode in [A_MULT,A_MULTU]) and
(not RegModifiedBetween(taicpu(p).oper[1]^.reg,p,next)) and
Assigned(FindRegDealloc(taicpu(p).oper[0]^.reg,tai(next.next))) then
begin
if MatchOperand(taicpu(next).oper[0]^,taicpu(p).oper[0]^.reg) then
begin
taicpu(next).loadreg(0,taicpu(p).oper[1]^.reg);
asml.remove(p);
p.free;
p:=next;
end
else if MatchOperand(taicpu(next).oper[1]^,taicpu(p).oper[0]^.reg) then
begin
taicpu(next).loadreg(1,taicpu(p).oper[1]^.reg);
asml.remove(p);
p.free;
p:=next;
end;
end;
{ TODO: MOVE Rx,Ry; Bcc Rx,Rz,label; dealloc Rx ==> Bcc Ry,Rz,label }
end;
end;
A_LB,A_LBU,A_LH,A_LHU,A_LW,
A_ADD,A_ADDU,
A_ADDI,A_ADDIU,