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Z80: Fix optimizations around multiplication

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This commit is contained in:
Karol Stasiak 2019-08-03 16:42:40 +02:00
parent 9962a8344a
commit 10c76dcc9c
1 changed files with 9 additions and 6 deletions
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15
src/main/scala/millfork/assembly/z80/opt/ReverseFlowAnalyzer.scala
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@ -191,6 +191,9 @@ object ReverseFlowAnalyzer {
val readsH: Set[String] = Set("__divmod_u16u8u16u8", "call")
val readsL: Set[String] = Set("__divmod_u16u8u16u8", "call")
val preservesH: Set[String] = Set("__mul_u8u8u8")
val preservesL: Set[String] = Set("__mul_u8u8u8")
//noinspection RedundantNewCaseClass
def analyze(f: NormalFunction, code: List[ZLine]): List[CpuImportance] = {
cache.get(code).foreach(return _)
@ -366,9 +369,9 @@ object ReverseFlowAnalyzer {
c = if (readsC(n)) Important else Unimportant,
d = if (readsD(n)) Important else Unimportant,
e = if (readsE(n)) Important else Unimportant,
h = if (readsH(n)) Important else Unimportant,
l = if (readsL(n)) Important else Unimportant,
hlNumeric = Unimportant,
h = if (readsH(n)) Important else if (preservesH(n)) currentImportance.h else Unimportant,
l = if (readsL(n)) Important else if (preservesL(n)) currentImportance.l else Unimportant,
hlNumeric = if (preservesH(n) && preservesL(n)) currentImportance.hlNumeric else Unimportant,
iyh = Unimportant,
iyl = Unimportant,
zf = Unimportant,
@ -438,9 +441,9 @@ object ReverseFlowAnalyzer {
c = if (readsC(n)) Important else Unimportant,
d = if (readsD(n)) Important else Unimportant,
e = if (readsE(n)) Important else Unimportant,
h = if (readsH(n)) Important else Unimportant,
l = if (readsL(n)) Important else Unimportant,
hlNumeric = Unimportant,
h = if (readsH(n)) Important else if (preservesH(n)) currentImportance.h else Unimportant,
l = if (readsL(n)) Important else if (preservesL(n)) currentImportance.l else Unimportant,
hlNumeric = if (preservesH(n) && preservesL(n)) currentImportance.hlNumeric else Unimportant,
iyh = Unimportant,
iyl = Unimportant,
zf = Unimportant,