5d18e93bd6
Reason for revert: This is also unsound for the reasons outlined in https://codereview.chromium.org/1473073004/ Will help Fedor to implement a solution based on simplified operators. Original issue's description: > binary-operator-reducer: reduce mul+div(shift) > > Reduction Input: > > ChangeInt32ToFloat64=> TruncateFloat64ToInt32 > Float64Mul=> > ChangeInt32ToFloat64=> Float64Div=>TruncateFloat64ToInt32 > > Output: > > => TruncateInt64ToInt32 > Int64Mul > => Int64Shr => TruncateInt64ToInt32 > > Test code: > > function mul(a, b) { > var l = a & 0x3ffffff; > var h = b & 0x3ffffff; > var m = l * h; > > var rl = m & 0x3ffffff; > var rh = (m / 0x4000000) | 0; > > return rl | rh; > } > > mul(1, 2); > var a0 = mul(0x3ffffff, 0x3ffffff); > mul(0x0, 0x0); > %OptimizeFunctionOnNextCall(mul); > var a1 = mul(0x3ffffff, 0x3ffffff); > > print(a0 + ' == ' + a1); > > BUG= > R=mstarzinger@chromium.org > > Committed: https://crrev.com/461e5b49d022335a7fc4e9d172397a4bd48b93d4 > Cr-Commit-Position: refs/heads/master@{#31899} TBR=mstarzinger@chromium.org,danno@chromium.org,titzer@chromium.org,fedor@indutny.com NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true BUG= Review URL: https://codereview.chromium.org/1478923002 Cr-Commit-Position: refs/heads/master@{#32313} |
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