paweld/fpc
1
0
Fork 0
mirror of https://gitlab.com/freepascal.org/fpc/source.git synced 2025-07-20 19:56:04 +02:00
Code Issues Packages Projects Releases Wiki Activity

Only perform OpCp2Op optimization when the first Op is ANDI and comparison is against 0.

Browse Source 
(cherry picked from commit f83a8f0f8f)
This commit is contained in:
ccrause 2023-03-09 07:33:24 +02:00 committed by florian
parent 0c5256300a
commit aadb53e72c
1 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
compiler/avr/aoptcpu.pas
View File

@ -304,10 +304,10 @@ Implementation
begin begin
{ {
change change
<op> reg,x,y <op> reg,x
cp reg,r1 cp reg,r1
into into
<op>s reg,x,y <op>s reg,x
} }
{ this optimization can applied only to the currently enabled operations because { this optimization can applied only to the currently enabled operations because
the other operations do not update all flags and FPC does not track flag usage } the other operations do not update all flags and FPC does not track flag usage }
@ -327,13 +327,13 @@ Implementation
(taicpu(p).opcode = A_ANDI) and (taicpu(p).opcode = A_ANDI) and
(taicpu(p).oper[1]^.typ=top_const) and (taicpu(p).oper[1]^.typ=top_const) and
(taicpu(hp1).oper[1]^.typ=top_const) and (taicpu(hp1).oper[1]^.typ=top_const) and
(taicpu(p).oper[1]^.val=taicpu(hp1).oper[1]^.val))) and (taicpu(hp1).oper[1]^.val=0))) and
GetNextInstruction(hp1, hp2) and GetNextInstruction(hp1, hp2) and
{ be careful here, following instructions could use other flags { be careful here, following instructions could use other flags
however after a jump fpc never depends on the value of flags } however after a jump fpc never depends on the value of flags }
{ All above instructions set Z and N according to the following { All above instructions set Z and N according to the following
Z := result = 0; Z := result = 0;
N := result[31]; N := result[7];
EQ = Z=1; NE = Z=0; EQ = Z=1; NE = Z=0;
MI = N=1; PL = N=0; } MI = N=1; PL = N=0; }
MatchInstruction(hp2, A_BRxx) and MatchInstruction(hp2, A_BRxx) and