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Cycles: add /jumptablerdata to MSVC compiler flags #110470

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Xavier Hallade merged 1 commits from xavierh/blender:jumptablerdata into main 2023-07-25 19:19:44 +02:00
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Xavier Hallade commented 2023-07-25 19:00:09 +02:00
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Starting with MSVC 17.7 preview 3, the /jumptablerdata flag is available and allows to ensure jump tables don't get mixed with the code, helping on performance when there is contention in a large switch statement, such as in svm_eval_nodes.

On my machine with a 13900K CPU, it gives a +2% speedup in average:

scene speedup
attic 1.02
bistro 1.01
cyclesx_barbershop_interior 1.02
cyclesx_bmw27 1.01
cyclesx_classroom 1.02
cyclesx_fishy_cat 1.01
cyclesx_junkshop 1.02
cyclesx_koro 1.03
cyclesx_monster 1.01
cyclesx_pabellon 1.03
cyclesx_pvt_flat 1.02
lone_monk 1.02
secret_deer 1.04
sponza 1.03
spring 1.01
average 1.02
Starting with MSVC 17.7 preview 3, the `/jumptablerdata` flag is available and allows to ensure jump tables don't get mixed with the code, helping on performance when there is contention in a large switch statement, such as in `svm_eval_nodes`. On my machine with a 13900K CPU, it gives a +2% speedup in average: | scene | speedup | | --------------------------- | ------- | | attic | 1.02 | | bistro | 1.01 | | cyclesx_barbershop_interior | 1.02 | | cyclesx_bmw27 | 1.01 | | cyclesx_classroom | 1.02 | | cyclesx_fishy_cat | 1.01 | | cyclesx_junkshop | 1.02 | | cyclesx_koro | 1.03 | | cyclesx_monster | 1.01 | | cyclesx_pabellon | 1.03 | | cyclesx_pvt_flat | 1.02 | | lone_monk | 1.02 | | secret_deer | 1.04 | | sponza | 1.03 | | spring | 1.01 | | **average** | **1.02** |
Xavier Hallade added 1 commit 2023-07-25 19:00:23 +02:00
37817cfc24 Cycles: add /jumptablerdata to MSVC compiler flags 
Starting with MSVC 17.7 preview 3, /jumptablerdata is available and
allows to ensure switch tables don't get mixed with the code, helping on
performance when there is contention in a large switch statement, such
as in svm.h.
Xavier Hallade added the
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Render & Cycles
 label 2023-07-25 19:00:37 +02:00
Xavier Hallade added this to the 4.0 milestone 2023-07-25 19:00:40 +02:00
Xavier Hallade added this to the Render & Cycles project 2023-07-25 19:00:44 +02:00
Xavier Hallade requested review from Brecht Van Lommel 2023-07-25 19:01:03 +02:00
Brecht Van Lommel approved these changes 2023-07-25 19:18:15 +02:00
Brecht Van Lommel left a comment
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Nice find.

Nice find.
Xavier Hallade merged commit 716f909a4f into main 2023-07-25 19:19:44 +02:00
Xavier Hallade deleted branch jumptablerdata 2023-07-25 19:19:45 +02:00
Ray molenkamp reviewed 2023-07-25 19:32:43 +02:00
intern/cycles/CMakeLists.txt
@ -86,0 +86,4 @@
# "jumptablerdata" improves performance when there is contention in large switch statements such as in svm.h
# This flag is supported starting with MSVC 17.7 preview 3:
# https://learn.microsoft.com/en-us/cpp/build/reference/jump-table-rdata
if(MSVC_VERSION GREATER_EQUAL 1937)
Ray molenkamp commented 2023-07-25 19:32:43 +02:00
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I don't think 1937 is specific enough to target 17.7 preview 3, non developers do use the preview compilers these days and may still be on update 1 or 2 (we black listed 17.6 due to a bad codegen, which moved some blender enthusiast style users over to the preview channel but i don't see them updating it on a regular basis)

if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 19.37.32820)

should do nicely though. (19.37.32820 is 17.7 preview 3)

I don't think 1937 is specific enough to target 17.7 preview 3, non developers do use the preview compilers these days and may still be on update 1 or 2 (we black listed 17.6 due to a bad codegen, which moved some blender enthusiast style users over to the preview channel but i don't see them updating it on a regular basis) ``` if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 19.37.32820) ``` should do nicely though. (19.37.32820 is 17.7 preview 3)
Xavier Hallade commented 2023-07-25 20:00:32 +02:00
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sure! your proposition will be nicer to them, done with b0d1226b6c

sure! your proposition will be nicer to them, done with https://projects.blender.org/blender/blender/commit/b0d1226b6cb16a155ce8a89840f0ff326ea3f4aa
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