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avoid #8231, bitwise move to mul,div (#15070)

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* avoid #8231, bitwise move to mul,div

* add test for #8231

* fix bitwise move when div result is float

* bitwise move depends on typ.size
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Bung 2020-08-25 15:58:32 +08:00 • committed by GitHub
commit 7cee63bba3
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2 changed files with 13 additions and 2 deletions
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12
compiler/jsgen.nim
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@ -602,8 +602,16 @@ proc arithAux(p: PProc, n: PNode, r: var TCompRes, op: TMagic) =
of mMulF64: applyFormat("($1 * $2)", "($1 * $2)")
of mDivF64: applyFormat("($1 / $2)", "($1 / $2)")
of mShrI: applyFormat("", "")
of mShlI: applyFormat("($1 << $2)", "($1 << $2)")
of mAshrI: applyFormat("($1 >> $2)", "($1 >> $2)")
of mShlI:
if n[1].typ.size <= 4:
applyFormat("($1 << $2)", "($1 << $2)")
else:
applyFormat("($1 * Math.pow(2,$2))", "($1 * Math.pow(2,$2))")
of mAshrI:
if n[1].typ.size <= 4:
applyFormat("($1 >> $2)", "($1 >> $2)")
else:
applyFormat("Math.floor($1 / Math.pow(2,$2))", "Math.floor($1 / Math.pow(2,$2))")
of mBitandI: applyFormat("($1 & $2)", "($1 & $2)")
of mBitorI: applyFormat("($1 | $2)", "($1 | $2)")
of mBitxorI: applyFormat("($1 ^ $2)", "($1 ^ $2)")