specified, but equal to DS in the current memory model -> call the high level
code generator with a near pointer type in order to force the segment to be
ignored
git-svn-id: trunk@27716 -
segment to survive e.g. several nested vecnodes, which cause the base register
to change from BP to something else. In the cases where the ss: prefix is not
needed, it is removed by make_simple_ref.
+ remove the ss: prefix in the several cases where make_simple_ref isn't called
(namely spilling and tcg8086.a_call_reg_far)
git-svn-id: trunk@27714 -
after r27581 in regard to floating point comparisons. The tcmpnan.pp test now
almost works (i.e. fails due to only one error, instead of many).
git-svn-id: trunk@27605 -
+ added helper function to i8086's symcpu is_proc_far that dispatches the call
to the proper is_far method (because we can't make a cpu specific descendant
of tabstractprocdef and add it there)
* all checks for (po_far in procoptions) in the i8086 code generator replaced
with calls to is_proc_far
git-svn-id: trunk@27559 -
+ x86 targets now directly call procedure variables located in references.
- a_call_ref method removed from tcg and thlcgobj.
git-svn-id: trunk@26666 -
tcg8086.a_op_const_reg, when the target CPU is 8086/8088, because it's
supposed to be faster on these processors, according to Intel's instruction
timings.
git-svn-id: trunk@26493 -
tcg8086.a_op_const_reg, since that optimization is already done in
optimize_op_const, which is called earlier in the same method.
git-svn-id: trunk@26488 -
overflow checking should not be implemented there. It should only leave the
flags in place for the jo instruction, which the IMUL instruction already
does.
git-svn-id: trunk@26487 -
size is >=16-bit:
o Generated code is now one instruction and one byte shorter.
o No 8-bit subregisters are used, which reduces register pressure.
git-svn-id: trunk@26336 -
tcg8086.a_load_reg_ref, which additionally fixes the following issues:
o The higher parts of the source register is no longer modified.
o The source register's size is no longer modified with makeregsize.
o Conversion from OS_S8 to a larger size is now supported.
git-svn-id: trunk@26335 -
o When expanding from a OS_8 to a 16-bit or 32-bit tcgsize, use the R_SUBH
subregister to initialize the high 16 bits of the register to zero. This
generates shorter and faster code, without increasing register
interferences, because R_SUBH has the same register constraints on i8086 as
R_SUBL, which is already used on the same imaginary register.
o After performing operations on the 8-bit subparts of a register that was
initially 16-bit, call makeregsize(OS_16) to notify the register allocator
that the register is once again 16-bit.
git-svn-id: trunk@26328 -
dest are subregisters of the same superregister, but of different sizes:
o Do not emit spurious moves from a register to the same register.
o Correctly support the case when converting from 16-bit to 32-bit int.
Previously it didn't work correctly, because in this particular case, due
to the way the GetNextReg scheme works, we have reg1=reg2.
git-svn-id: trunk@26313 -
- use a_op_const_reg for the multiplication, instead of emitting directly
instructions, which are 186+
- avoid using IMUL twice, when the element size is not power of two
- rm the system_i386_win32 leftovers
git-svn-id: trunk@25826 -
OP_OR or OP_XOR operation into two 16-bit parts, call a_op_const_reg/ref
recursively for the 16-bit parts, so certain optimizations can be done if the
low or high 16-bit of the const are $ffff.
git-svn-id: trunk@25703 -
