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diff --git a/chapter04/README.md b/chapter04/README.md index 2c7f7e9c..07085e80 100644 --- a/chapter04/README.md +++ b/chapter04/README.md @@ -305,6 +305,7 @@ Here is a list of peepholes introduced in this Chapter, more will be introduced | Before | After | Description | |-----------------------|-----------------------|------------------------------------------------| | (arg + 0 ) | arg | Add of zero identity | +| (arg - 0 ) | arg | Sub of zero identity | | (arg * 1 ) | arg | Multiple of one identity | | (con + arg) | (arg + con) | Move constants to right, to encourage folding | | (con * arg) | (arg * con) | Move constants to right, to encourage folding | @@ -312,6 +313,9 @@ Here is a list of peepholes introduced in this Chapter, more will be introduced | ((arg1 + con) + arg2) | ((arg1 + arg2) + con) | Move constants to right, to encourage folding | | (arg + arg) | (arg * 2) | Sum-of-products form | | (arg - arg) | 0 | Sub of same is 0 +| (0 - arg) | (-arg) | Sub from 0 is negation +| (arg1 - (-arg2)) | (arg1 + arg2) | Sub of negation is add +| ((-arg1) - arg2) | -(arg1 + arg2) | Sub from negation is negation of sum | (con / 1) | con | Division by one | (arg == arg) | 1 | Compare of same | (arg != arg) | 0 | Compare of same |