Is this rule correct? In PM0044 STM8 CPU Programming manual popw only gets 16bit registers (X, Y)
replace restart {
popw a
popw a
} by {
popw x
; peephole 14a merged pop a into popw x
} if notUsed('a'), notUsed('x')
This rule is from file https://sourceforge.net/p/sdcc/code/HEAD/tree/trunk/sdcc/src/stm8/peeph.def#l412
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