From 1a9cac97df063af82516ca35bde34fde62d24c56 Mon Sep 17 00:00:00 2001 From: Dibyendu Majumdar Date: Sat, 11 Nov 2023 23:17:22 +0000 Subject: Chapter 6 (#38) * #37 Create chapter 6 skeleton * #37 Revise type system - TOP, BOTTOM, CONTROL are now directly implemented in Type, XCONTROL is a new type and that's implemented directly too. We have a _type field that is like an enum. * #37 Revise Type.meet() - this is now final. Subclasses can override xmeet() which is protected but now handles simple types in Type itself. * #37 Basic test for peephole of CFG * #37 Revise compute of if * #37 Revise compute of if * #37 WIP peephole of If * #37 WIP peephole of If * #37 WIP peephole of If * #37 WIP peephole of If * #37 WIP peephole of If * #37 WIP fix the chars inserted by IntelliJ * #37 WIP Fix compute type in IfNode * #37 WIP Null check region inputs * #37 WIP Fix where we choose great grand parent instead of grand parent Add new test * #37 WIP More fixes and tests * #37 WIP Some minor adjustments * Cleanup folding dead IF tests Remove isDeadCtrl & just test for the constant. Remove DEAD_CTRL, doesn't properly reset between tests. Move keep/unkeep to Node. PhiNode has a proper compute() call. ProjNode ideal is a lot simpler. Region doesn't ever get a null. Move the mergeScopes Region peep till after all Phis are added. Type TOP and XCONTROL count as constants. TypeTuple gets a toString * #37 WIP Upate README * #37 WIP Region node should check if one of its inputs is a region that needs to be peepholed * #37 WIP If node should check if its ctrl input is a Region that has only 1 live input so can be peepholed * #37 WIP Further update to README to make the peephole logic clearer. Also discuss the relationship between Region and Phi nodes * Region removes dead input paths Remove region-folding in Return, If. Add a Makefile. Reformat triple-quote lines to be emacs-friendly. * StopNode idealize Return type sharpens to include control input. * Remove !=, >=, >; use Not and <, <=, == Fix bug mixing rotating different ops. Generalize Add fold constants; apply to Mul, EQ. Fix Div.copy * Fix bug rotating e.g. < or <= Peep is only valid for associative ops * #37 WIP Doc updates * Work over the Ch6 Readme Major issue: Region inputs align 1-to-1 with Phi inputs, but a Region can have zero to many Phis. When we lose a Region input (dead path), we need to lose the same inputs to each Phi - but we don't lose the Phis themselves, unless we're folding away down to the last live input. * Update chapter06/README.md Co-authored-by: Yichen Yan * Update chapter06/README.md Co-authored-by: Yichen Yan * #37 Backport type system changes to chapter 2 * #37 Backport type system changes to chapter 3 * #37 Backport type system changes to chapter 4 * #37 Backport type system changes to chapter 5 * #37 Merge chapter 5 updates from main. Remove language grammar module as we describe the grammar incrementally in each chapter. * #37 Chapter 6 doc updates - added visuals to show effects of CFG peephole * #37 Sync some updates to chapter 2 * #37 Sync some updates to chapter 3 * #37 Sync some updates to chapter 4 --------- Co-authored-by: Cliff Click Co-authored-by: Yichen Yan --- README.md | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'README.md') diff --git a/README.md b/README.md index d8f99553..59a342b1 100644 --- a/README.md +++ b/README.md @@ -26,7 +26,6 @@ Sea Of Nodes intermediate representation. The simple language will be a small subset of C. -* [Language](language/README.md): Simple language grammar. * [Chapter 1](chapter01/README.md): Script that returns an integer literal, i.e., an empty function that takes no arguments and returns a single integer value. The `return` statement. * [Chapter 2](chapter02/README.md): Simple binary arithmetic such as addition, subtraction, multiplication, division with constants. Peephole optimization / simple constant folding. @@ -34,7 +33,7 @@ The simple language will be a small subset of C. constant. * [Chapter 4](chapter04/README.md): A non-constant external variable input named `arg`. Binary and Comparison operators involving constants and `arg`. Non-zero values will be truthy. Peephole optimizations involving algebraic simplifications. * [Chapter 5](chapter05/README.md): `if` statement. CFG construction. -* Chapter 6: Peephole optimization around dead control flow. +* [Chapter 6](chapter06/README.md): Peephole optimization around dead control flow. * Chapter 7: `while` statement. * Chapter 8: Global Value Numbering. * Chapter 9: Functions and calls. -- cgit v1.2.3