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* run dead store elimination multiple times if needed

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This commit is contained in:
florian 2022-11-02 22:14:12 +01:00
parent a0366d7d28
commit 342524c312
2 changed files with 12 additions and 7 deletions
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6
compiler/optdeadstore.pas
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@ -31,7 +31,7 @@ unit optdeadstore;
uses uses
node; node;
function do_optdeadstoreelim(var rootnode : tnode) : tnode; function do_optdeadstoreelim(var rootnode : tnode;changed: boolean) : tnode;
implementation implementation
@ -106,9 +106,7 @@ unit optdeadstore;
end; end;
function do_optdeadstoreelim(var rootnode: tnode): tnode; function do_optdeadstoreelim(var rootnode: tnode;changed: boolean): tnode;
var
changed: boolean;
begin begin
{$ifdef EXTDEBUG_DEADSTORE} {$ifdef EXTDEBUG_DEADSTORE}
writeln('******************* Tree before deadstore elimination **********************'); writeln('******************* Tree before deadstore elimination **********************');

13
compiler/psub.pas
View File

@ -1294,15 +1294,22 @@ implementation
tabstractnormalvarsym(tloadnode(dfabuilder.nodemap[i]).symtableentry).noregvarinitneeded:=true tabstractnormalvarsym(tloadnode(dfabuilder.nodemap[i]).symtableentry).noregvarinitneeded:=true
end; end;
end; end;
if cs_opt_dead_store_eliminate in current_settings.optimizerswitches then
begin
changed:=false;
repeat
do_optdeadstoreelim(code,changed);
if changed then
dfabuilder.redodfainfo(code);
until not(changed);
end;
end end
else else
begin begin
ConvertForLoops(code); ConvertForLoops(code);
end; end;
if (pi_dfaavailable in flags) and (cs_opt_dead_store_eliminate in current_settings.optimizerswitches) then
do_optdeadstoreelim(code);
if (cs_opt_remove_empty_proc in current_settings.optimizerswitches) and if (cs_opt_remove_empty_proc in current_settings.optimizerswitches) and
(procdef.proctypeoption in [potype_operator,potype_procedure,potype_function]) and (procdef.proctypeoption in [potype_operator,potype_procedure,potype_function]) and
(code.nodetype=blockn) and (tblocknode(code).statements=nil) then (code.nodetype=blockn) and (tblocknode(code).statements=nil) then