Commit Graph

12 Commits

Author SHA1 Message Date
greg-lunarg
5ea7099374 Add two new simplifications. (#2984)
Implements the following simplifications:

(a - b) + b => a
(a * b) + (a * c) => a * (b + c)

Also adds logic to simplification to handle rules that create new operations
that might need simplification, such as the second rule above.

Only perform the second simplification if the multiplies have the add as their
only use. Otherwise this is a deoptimization of size and performance.
2019-10-28 08:19:38 -07:00
Steven Perron
15fc19d091
Refactor instruction folders (#2815)
* Refactor instruction folders

We want to refactor the instruction folder to allow different sets of
rules to be added to the instruction folder.  We might want different
sets of rules in different circumstances.

We also need a way to add rules for extended instructions.  Changes are
made to the FoldingRules class and ConstFoldingRules class to enable
that.

We added tests to check that we can fold extended instructions using the
new framework.

At the same time, I noticed that there were two tests that did not tests
what they were suppose to.  They could not be easily salvaged. #2813 was
opened to track adding the new tests.
2019-08-26 18:54:11 -04:00
alan-baker
7fd2365b06
Don't move debug or decorations when folding (#2772)
Fixes #2764

* Don't replace all uses when simplifying instructions, instead only
update non-debug, non-decoration uses
  * added a test
* Add a new version of RAUW that takes a predicate to decide whether to
replace the use or not
  * used in simplification pass
2019-07-29 16:20:43 -04:00
Steven Perron
86e45efe15
Handle decorations better in some optimizations (#2716)
There are a couple spots where we are not looking at decorations when we should.

1. Value numbering is suppose to assign a different value number to ids if they have different decorations.  However that is not being done for OpCopyObject and OpPhi.

1. Instruction simplification is propagating OpCopyObject instruction without checking for decorations.  It should only do that if no decorations are being lost.

Add a new function to the decoration manager to check if the decorations of one id are a subset of the decorations of another.

Fixes #2715.
2019-07-10 11:37:16 -04:00
dan sinclair
eda2cfbe12
Cleanup includes. (#1795)
This Cl cleans up the include paths to be relative to the top level
directory. Various include-what-you-use fixes have been added.
2018-08-03 15:06:09 -04:00
dan sinclair
c7da51a085
Cleanup extraneous namespace qualifies in source/opt. (#1716)
This CL follows up on the opt namespacing CLs by removing the
unnecessary opt:: and opt::analysis:: namespace prefixes.
2018-07-12 15:14:43 -04:00
dan sinclair
f96b7f1cb9
use Pass::Run to set the context on each pass. (#1708)
Currently the IRContext is passed into the Pass::Process method. It is
then up to the individual pass to store the context into the context_
variable. This CL changes the Run method to store the context before
calling Process which no-longer receives the context as a parameter.
2018-07-12 09:08:45 -04:00
dan sinclair
e6b953361d
Move the ir namespace to opt. (#1680)
This CL moves the files in opt/ to consistenly be under the opt::
namespace. This frees up the ir:: namespace so it can be used to make a
shared ir represenation.
2018-07-09 11:32:29 -04:00
Steven Perron
a45d4cac61 Move folding routines into a class
The folding routines are currently global functions.  They also rely on
data in an std::map that holds the folding rules for each opcode.  This
causes that map to not have a clear owner, and therefore never gets
deleted.

There has been a request to delete this map.  To implement this, we will
create a InstructionFolder class that owns the maps.  The IRContext will
own the InstructionFolder instance.  Then the global functions will
become public memeber functions of the InstructionFolder.

Fixes https://github.com/KhronosGroup/SPIRV-Tools/issues/1659.
2018-07-05 17:52:43 -04:00
Steven Perron
2eb9bfb5b6 Remove stores of undef.
When storing an undef, any value is valid, including the one already in
that memory location.  So we can avoid the store.
2018-06-29 09:49:19 -04:00
Steven Perron
6669d8163d Fold binary floating point operators.
Adds the floating rules for FAdd, FDiv, FMul, and FSub.

Contributes to #1164.
2018-02-14 15:48:15 -05:00
Steven Perron
06cdb96984 Make use of the instruction folder.
Implementation of the simplification pass.

- Create pass that calls the instruction folder on each instruction and
  propagate instructions that fold to a copy.  This will do copy
  propagation as well.

- Did not use the propagator engine because I want to modify the instruction
  as we go along.

- Change folding to not allocate new instructions, but make changes in
  place.  This change had a big impact on compile time.

- Add simplification pass to the legalization passes in place of
  insert-extract elimination.

- Added test cases for new folding rules.

- Added tests for the simplification pass

- Added a method to the CFG to apply a function to the basic blocks in
  reverse post order.

Contributes to #1164.
2018-02-07 23:01:47 -05:00