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* x86: RegModifiedByInstruction and RegInInstruction

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are now more accurate for (I)MUL and (I)DIV.
This commit is contained in:
J. Gareth "Curious Kit" Moreton 2022-02-25 00:53:57 +00:00 committed by FPK
parent 3635f7cd6f
commit d372286159
1 changed files with 57 additions and 20 deletions
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37
compiler/x86/aoptx86.pas
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@ -988,6 +988,25 @@ unit aoptx86;
{ change information for xmm movsd are not correct }
((taicpu(p1).opcode<>A_MOVSD) or (taicpu(p1).ops=0)) then
begin
{ Handle instructions that behave differently depending on the size and operand count }
case taicpu(p1).opcode of
A_MUL, A_DIV, A_IDIV:
if taicpu(p1).opsize = S_B then
Result := (getsupreg(Reg) = RS_EAX)
else
Result := (getsupreg(Reg) in [RS_EAX, RS_EDX]);
A_IMUL:
if taicpu(p1).ops = 1 then
begin
if taicpu(p1).opsize = S_B then
Result := (getsupreg(Reg) = RS_EAX)
else
Result := (getsupreg(Reg) in [RS_EAX, RS_EDX]);
end;
{ If ops are greater than 1, call inherited method }
else
case getsupreg(reg) of
{ RS_EAX = RS_RAX on x86-64 }
RS_EAX:
@ -1009,6 +1028,8 @@ unit aoptx86;
else
;
end;
end;
if result then
exit;
end
@ -1140,8 +1161,24 @@ unit aoptx86;
Result := (taicpu(p1).ops=3) and (taicpu(p1).oper[2]^.typ=top_reg) and RegInOp(reg,taicpu(p1).oper[2]^);
exit;
end;
A_MUL, A_DIV, A_IDIV:
begin
if taicpu(p1).opsize = S_B then
Result := (getsupreg(Reg) = RS_EAX)
else
Result := (getsupreg(Reg) in [RS_EAX, RS_EDX]);
end;
A_IMUL:
begin
if taicpu(p1).ops = 1 then
begin
Result := (getsupreg(Reg) in [RS_EAX, RS_EDX]);
end
else
Result := (taicpu(p1).oper[taicpu(p1).ops-1]^.typ=top_reg) and RegInOp(reg,taicpu(p1).oper[taicpu(p1).ops-1]^);
Exit;
end;
else
;
end;