Skip to content
Snippets Groups Projects
Commit 89285e4d authored by Faith Ekstrand's avatar Faith Ekstrand :speech_balloon:
Browse files

nir: add new constant folding infrastructure


Add a required field to the Opcode class, const_expr, that contains an
expression or statement that computes the result of the opcode given known
constant inputs. Then take those const_expr's and expand them into a function
that takes an opcode and an array of constant inputs and spits out the constant
result. This means that when adding opcodes, there's one less place to update,
and almost all the opcodes are self-documenting since the information on how to
compute the result is right next to the definition.

The helper functions in nir_constant_expressions.c were taken from
ir_constant_expressions.cpp.

v3 Jason Ekstrand <jason.ekstrand@iastate.edu>
 - Use mako to generate one function per opcode instead of doing piles of
   string splicing

v4 Jason Ekstrand <jason.ekstrand@iastate.edu>
 - More comments and better indentation in the mako
 - Add a description of the constant expression language in nir_opcodes.py
 - Added nir_constant_expressions.py to EXTRA_DIST in Makefile.am

Signed-off-by: default avatarJason Ekstrand <jason.ekstrand@intel.com>
Reviewed-by: default avatarConnor Abbott <cwabbott0@gmail.com>
parent fa4bc6c1
No related branches found
No related tags found
No related merge requests found
Loading
0% Loading or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment