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* x86: Bug fix where improved AddMov2Mov optimisation didn't

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check to see if the other register was modified in between
This commit is contained in:
J. Gareth "Curious Kit" Moreton 2022-10-13 16:11:40 +01:00 committed by FPK
parent fa76baa3d4
commit 41b8f6a42e
1 changed files with 6 additions and 0 deletions
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6
compiler/x86/aoptx86.pas
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@ -12799,6 +12799,7 @@ unit aoptx86;
{ Change:
add %reg2,%reg1
(%reg2 not modified in between)
mov/s/z #(%reg1),%reg1 (%reg1 superregisters must be the same)
To:
@ -12825,6 +12826,11 @@ unit aoptx86;
not SuperRegistersEqual(taicpu(p).oper[1]^.reg, taicpu(hp1).oper[1]^.reg) and
MemRegisterNotUsedLater
)
) and
(
{ Instructions are guaranteed to be adjacent on -O2 and under }
not (cs_opt_level3 in current_settings.optimizerswitches) or
not RegModifiedBetween(taicpu(p).oper[0]^.reg, p, hp1)
) then
begin
AllocRegBetween(taicpu(p).oper[0]^.reg, p, hp1, UsedRegs);