[PATCH] D135453: [SelectionDAG] Use consistent type sizes for opcode

Wed Oct 12 06:59:31 PDT 2022

mbrkusanin added a comment.

I ran a test with 100 fadd float instructions ('-debug' reported 106 nodes) and measured memory with '--time-passes -track-memory' option.
There were small differences in reported memory between runs (not sure what is the reason for this).
Here are the results for 10 runs for 'AMDGPU DAG->DAG Pattern Instruction Selection' pass:

int16_t

205696
204768
204816
206528
206528
205696
205696
205648
206528
204816

avg = 205672

int32_t

209808
209808
210640
209760
209808
209808
210640
209808
210640
209808

avg = 210052.8

increase:
210052.8 / 205672 = 1.0212999338753

Other passes were mostly indentical with small variations between runs.

sizeof(SDNode) went from 88 to 96.

Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D135453/new/

https://reviews.llvm.org/D135453