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* MIPS: overflow checking added in r24445 works only when source and destination of operation are different registers. Fixed cases of operations on same register.

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git-svn-id: trunk@24507 -
This commit is contained in:
sergei 2013-05-15 09:55:47 +00:00
parent 2ec85e9705
commit bfd7401541
1 changed files with 24 additions and 8 deletions
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32
compiler/mips/cgcpu.pas
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@ -862,6 +862,8 @@ procedure TCGMIPS.overflowcheck_internal(list: tasmlist; arg1, arg2: tregister);
var
carry, hreg: tregister;
begin
if (arg1=arg2) then
InternalError(2013050501);
carry:=GetIntRegister(list,OS_INT);
hreg:=GetIntRegister(list,OS_INT);
list.concat(taicpu.op_reg_reg_reg(A_SLTU,carry,arg1,arg2));
@ -945,6 +947,10 @@ begin
ovloc.loc := LOC_VOID;
optimize_op_const(op,a);
signed:=(size in [OS_S8,OS_S16,OS_S32]);
if (setflags and (not signed) and (src=dst) and (op in [OP_ADD,OP_SUB])) then
hreg:=GetIntRegister(list,OS_INT)
else
hreg:=dst;
case op of
OP_NONE:
a_load_reg_reg(list,size,size,src,dst);
@ -954,16 +960,19 @@ begin
OP_ADD:
begin
handle_reg_const_reg(list,ops_add[setflags and signed],src,a,dst);
handle_reg_const_reg(list,ops_add[setflags and signed],src,a,hreg);
if setflags and (not signed) then
overflowcheck_internal(list,dst,src);
overflowcheck_internal(list,hreg,src);
{ does nothing if hreg=dst }
a_load_reg_reg(list,OS_INT,OS_INT,hreg,dst);
end;
OP_SUB:
begin
handle_reg_const_reg(list,ops_sub[setflags and signed],src,a,dst);
handle_reg_const_reg(list,ops_sub[setflags and signed],src,a,hreg);
if setflags and (not signed) then
overflowcheck_internal(list,src,dst);
overflowcheck_internal(list,src,hreg);
a_load_reg_reg(list,OS_INT,OS_INT,hreg,dst);
end;
OP_MUL,OP_IMUL:
@ -1009,21 +1018,28 @@ end;
procedure TCGMIPS.a_op_reg_reg_reg_checkoverflow(list: tasmlist; op: TOpCg; size: tcgsize; src1, src2, dst: tregister; setflags: boolean; var ovloc: tlocation);
var
signed: boolean;
hreg: TRegister;
begin
ovloc.loc := LOC_VOID;
signed:=(size in [OS_S8,OS_S16,OS_S32]);
if (setflags and (not signed) and (src2=dst) and (op in [OP_ADD,OP_SUB])) then
hreg:=GetIntRegister(list,OS_INT)
else
hreg:=dst;
case op of
OP_ADD:
begin
list.concat(taicpu.op_reg_reg_reg(ops_add[setflags and signed], dst, src2, src1));
list.concat(taicpu.op_reg_reg_reg(ops_add[setflags and signed], hreg, src2, src1));
if setflags and (not signed) then
overflowcheck_internal(list, dst, src2);
overflowcheck_internal(list, hreg, src2);
a_load_reg_reg(list, OS_INT, OS_INT, hreg, dst);
end;
OP_SUB:
begin
list.concat(taicpu.op_reg_reg_reg(ops_sub[setflags and signed], dst, src2, src1));
list.concat(taicpu.op_reg_reg_reg(ops_sub[setflags and signed], hreg, src2, src1));
if setflags and (not signed) then
overflowcheck_internal(list, src2, dst);
overflowcheck_internal(list, src2, hreg);
a_load_reg_reg(list, OS_INT, OS_INT, hreg, dst);
end;
OP_MUL,OP_IMUL:
begin