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m68k: try to optimize realconst operands into B/W/L sized integer operands. these are shorter to encode - which almost always means faster on m68k

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git-svn-id: trunk@42923 -
This commit is contained in:
Károly Balogh 2019-09-05 19:32:57 +00:00
parent a019536cd5
commit 36286441b2
1 changed files with 53 additions and 22 deletions
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75
compiler/m68k/aoptcpu.pas
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@ -39,6 +39,7 @@ unit aoptcpu;
function PeepHoleOptPass1Cpu(var p: tai): boolean; override;
function TryToOptimizeMove(var p: tai): boolean;
function MaybeRealConstOperSimplify(var p: tai): boolean;
{ outputs a debug message into the assembler file }
procedure DebugMsg(const s: string; p: tai);
@ -87,6 +88,56 @@ unit aoptcpu;
end
end;
function TCpuAsmOptimizer.MaybeRealConstOperSimplify(var p: tai): boolean;
var
tmpint64: int64;
tmpsingle: single;
begin
result:=false;
if (taicpu(p).oper[0]^.typ = top_realconst) then
begin
{ if we work with actual integers, turn the operand into one }
if frac(taicpu(p).oper[0]^.val_real) = 0 then
begin
tmpint64:=trunc(taicpu(p).oper[0]^.val_real);
if (high(shortint) >= tmpint64) and (low(shortint) <= tmpint64) then
begin
taicpu(p).opsize := S_B;
taicpu(p).oper[0]^.typ:=top_const;
end
else
if (high(smallint) >= tmpint64) and (low(smallint) <= tmpint64) then
begin
taicpu(p).opsize := S_W;
taicpu(p).oper[0]^.typ:=top_const;
end
else
if (high(longint) >= tmpint64) and (low(longint) <= tmpint64) then
begin
taicpu(p).opsize := S_L;
taicpu(p).oper[0]^.typ:=top_const;
end;
if (taicpu(p).oper[0]^.typ) = top_const then
begin
DebugMsg('Optimizer: FPU real const to integer',p);
taicpu(p).oper[0]^.val:=tmpint64;
result:=true;
end;
end
else
begin
tmpsingle:=taicpu(p).oper[0]^.val_real;
if (taicpu(p).opsize = S_FD) and
((taicpu(p).oper[0]^.val_real - tmpsingle) = 0.0) then
begin
DebugMsg('Optimizer: FPU real const to lesser precision',p);
taicpu(p).opsize:=S_FS;
result:=true;
end;
end;
end;
end;
function TCpuAsmOptimizer.RegLoadedWithNewValue(reg: tregister; hp: tai): boolean;
var
p: taicpu;
@ -252,7 +303,6 @@ unit aoptcpu;
var
next: tai;
tmpref: treference;
tmpsingle: single;
begin
result:=false;
case p.typ of
@ -359,16 +409,7 @@ unit aoptcpu;
result:=true;
end
else
begin
tmpsingle:=taicpu(p).oper[0]^.val_real;
if (taicpu(p).opsize = S_FD) and
((taicpu(p).oper[0]^.val_real - tmpsingle) = 0.0) then
begin
DebugMsg('Optimizer: FCMP const to lesser precision',p);
taicpu(p).opsize:=S_FS;
result:=true;
end;
end;
result:=result or MaybeRealConstOperSimplify(p);
end;
A_FMOVE,A_FMUL,A_FADD,A_FSUB,A_FDIV:
begin
@ -377,17 +418,7 @@ unit aoptcpu;
result:=true;
exit;
end;
if (taicpu(p).oper[0]^.typ = top_realconst) then
begin
tmpsingle:=taicpu(p).oper[0]^.val_real;
if (taicpu(p).opsize = S_FD) and
((taicpu(p).oper[0]^.val_real - tmpsingle) = 0.0) then
begin
DebugMsg('Optimizer: FMOVE/FMUL/FADD/FSUB/FDIV const to lesser precision',p);
taicpu(p).opsize:=S_FS;
result:=true;
end;
end;
result:=result or MaybeRealConstOperSimplify(p);
end;
end;
end;