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* don't use 'fnstsw ax' if the current cpu level is below 286

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git-svn-id: trunk@24401 -
This commit is contained in:
nickysn 2013-05-01 15:42:02 +00:00
parent 19c8abac0b
commit 4c95592e08
1 changed files with 22 additions and 4 deletions
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26
compiler/x86/nx86add.pas
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@ -953,6 +953,9 @@ unit nx86add;
procedure tx86addnode.second_cmpfloat;
var
resflags : tresflags;
{$ifdef i8086}
tmpref: treference;
{$endif i8086}
begin
if use_vectorfpu(left.resultdef) or use_vectorfpu(right.resultdef) then
begin
@ -971,10 +974,25 @@ unit nx86add;
tcgx86(cg).dec_fpu_stack;
{ load fpu flags }
cg.getcpuregister(current_asmdata.CurrAsmList,NR_AX);
emit_reg(A_FNSTSW,S_NO,NR_AX);
emit_none(A_SAHF,S_NO);
cg.ungetcpuregister(current_asmdata.CurrAsmList,NR_AX);
{$ifdef i8086}
if current_settings.cputype < cpu_286 then
begin
tg.gettemp(current_asmdata.CurrAsmList,2,2,tt_normal,tmpref);
emit_ref(A_FNSTSW,S_NO,tmpref);
cg.getcpuregister(current_asmdata.CurrAsmList,NR_AX);
emit_ref_reg(A_MOV,S_W,tmpref,NR_AX);
emit_none(A_SAHF,S_NO);
cg.ungetcpuregister(current_asmdata.CurrAsmList,NR_AX);
tg.ungettemp(current_asmdata.CurrAsmList,tmpref);
end
else
{$endif i8086}
begin
cg.getcpuregister(current_asmdata.CurrAsmList,NR_AX);
emit_reg(A_FNSTSW,S_NO,NR_AX);
emit_none(A_SAHF,S_NO);
cg.ungetcpuregister(current_asmdata.CurrAsmList,NR_AX);
end;
if nf_swapped in flags then
begin
case nodetype of