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* patch by J. Gareth Moreton: deadstore removal improvement, resolves #36669

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git-svn-id: trunk@44147 -
This commit is contained in:
florian 2020-02-10 20:48:45 +00:00
parent b1900bae9e
commit e7d2c93ca7
1 changed files with 18 additions and 5 deletions
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23
compiler/x86/aoptx86.pas
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@ -2578,11 +2578,24 @@ unit aoptx86;
result)
}
if IsExitCode(hp1) and
MatchOpType(taicpu(p),top_reg,top_ref) and
(taicpu(p).oper[1]^.ref^.base = current_procinfo.FramePointer) and
not(assigned(current_procinfo.procdef.funcretsym) and
(taicpu(p).oper[1]^.ref^.offset < tabstractnormalvarsym(current_procinfo.procdef.funcretsym).localloc.reference.offset)) and
(taicpu(p).oper[1]^.ref^.index = NR_NO) then
(taicpu(p).oper[1]^.typ = top_ref) and
(taicpu(p).oper[1]^.ref^.index = NR_NO) and
(
(
(taicpu(p).oper[1]^.ref^.base = current_procinfo.FramePointer) and
not (
assigned(current_procinfo.procdef.funcretsym) and
(taicpu(p).oper[1]^.ref^.offset <= tabstractnormalvarsym(current_procinfo.procdef.funcretsym).localloc.reference.offset)
)
) or
{ Also discard writes to the stack that are below the base pointer,
as this is temporary storage rather than a function result on the
stack, say. }
(
(taicpu(p).oper[1]^.ref^.base = NR_STACK_POINTER_REG) and
(taicpu(p).oper[1]^.ref^.offset < current_procinfo.final_localsize)
)
) then
begin
asml.remove(p);
p.free;