Optimized to minimize load latency and icache usage. Together with the
previous fpc_ansistr_decr_ref optimization this little test programm
runs about 40% faster.
program stringspeed;
procedure test(s:string);
begin
end;
var
s:string;
i: cardinal;
begin
s:='abcd';
for i:=0 to $FFFFFF do
test(s);
end.
Even with s:='' it's about 30% faster.
git-svn-id: trunk@22035 -
As fpc_ansistr_decr_ref is a very often called procedure in typical
pascal programs this optimized version will shave off some cycles
compared to the generic one.
It tries to avoid load latencies as much as possible and also uses the
new Z-flag functionality of the InterlockedDecrement from the previous
patch. Also FreeMem is called as a tail-function.
git-svn-id: trunk@22034 -
Use movs instead of mov when setting the result in r0. This way the Z
flag will be set for the calling function which might allow some smaller
optimizations later on. It does not affect current code in any way,
because flags are not expected to be used across function calls.
git-svn-id: trunk@22033 -
Especially with 64bit operators the CG sometimes generates:
and r0, r1, #0
Which just clears r0 and is equivalent with
mov r0, #0
git-svn-id: trunk@22032 -
In certain cases the CG would emit something like
bic r1, r0, #0
As BIC is clearing the specified bits this is equivalent to
mov r1, r0
This patch changes the CG to emit the mov instead which the register
allocator will hopefully remove most of the time.
git-svn-id: trunk@22024 -
default value (mantis #22343)
* give an error when specifying an invalid default value (e.g. a
floating point number for a longint parameter)
git-svn-id: trunk@22021 -
since they require function calls and it's not possible to call functions
inside constant blocks (and because current_procinfo is not necessarily
valid when a constant block is parsed, this moreover crashes the compiler)
git-svn-id: trunk@22018 -
Currently the register spiller can not handle the "bond" between IT* and
a following instruction, sometimes breaking them apart, which breaks the
build or worse the result.
So for now we're not emitting A_IT* in second_cmp64bit anymore but use a
conditional jump instead.
This fixes Mantis #22520
git-svn-id: trunk@22009 -
We're currently using rev for armv6+, but FPC 2.6 could not handle the
instruction. So if somebody wants to build trunk it can't be for armv6+.
We'll circumvent the problem by always using the the generic code when
build with FPC 2.6.
git-svn-id: trunk@22003 -
In r21686 I've introduced optimized 64bit shifts for ARM. But the
methods did not check for which machine it has to generate the code.
This patch disables the optimized code for now if the target is in
cpu_thumb2 and falls back to the generic code.
There are 2 problems with the current code:
1.) Thumb-2 does not support shift by register on all data instruction
as ARM does.
2.) The code does not generate the required IT-block for the conditional
executed code.
git-svn-id: trunk@21997 -
The old code generated a strange IT-sequence:
IT EQ
MOVEQ r0, #1
IT NE
MOVNE r0, #1
Now we generate:
ITE EQ
MOVEQ r0, #1
MOVNE r0, #1
IT stands for IfThen, ITE for IfThenElse it has a couple of other forms
where the instruction gets extended to handle more of the following
instructions. So we have ITEE, ITETE etc, up to 4 instructions can be
handled.
git-svn-id: trunk@21996 -
This adds some small improvements to Move_pld and Move_blended.
1.) Overlapping memory is handled as "unusual" and the code is placed at
the end of the function for better icache/bpu performance
2.) Fused the overlap check into 3 instructions with a single jump
instead of 5 instructions with 2 jumps.
2.) Use ldmia/stmia with 2 registers instead of ldr/str for faster
copying.
3.) Some code cleanup
git-svn-id: trunk@21992 -
+ Dedicated constructor TElfObjSection.create_reloc for relocation sections.
+ pass symbol name offset separately to TElfSymtab.writeSymbol, this is necessary for two-pass writing of dynamic symbol tables.
git-svn-id: trunk@21989 -
* check "A op B" and "B op A" again for operators that can be commutative (all binary ones except shl, shr, div, mod, **, / and -)
* also check for Nil for classrefdefs if left side is a pointer (allows "TClass var" <>/= Nil again, after the above changes)
* don't allow overloads for "implicit pointer type <>/= pointer" and the other way around (this fixes non compiling Objective Pascal test tobjc21.pp and also the new toperator87.pp test)
* some formating corrections
+ added test for "TObject <> Pointer"
+ added test for "TClass <>/= Nil"
git-svn-id: trunk@21983 -
