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[ir] [autodiff] Initialize ADStack with a zero #1791

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merged 3 commits into from
Aug 28, 2020

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codecov bot commented Aug 27, 2020

Codecov Report

Merging #1791 into master will not change coverage.
The diff coverage is n/a.

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@@           Coverage Diff           @@
##           master    #1791   +/-   ##
=======================================
  Coverage   61.74%   61.74%           
=======================================
  Files          19       19           
  Lines        3850     3850           
  Branches      691      691           
=======================================
  Hits         2377     2377           
  Misses       1348     1348           
  Partials      125      125           

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LGTMig!

Comment on lines 210 to 211
// Note that unlike AllocStmt, StackAllocaStmt does NOT have an 0 as
// initial value. Therefore here we push an initial 0 value.
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Suggested change
// Note that unlike AllocStmt, StackAllocaStmt does NOT have an 0 as
// initial value. Therefore here we push an initial 0 value.
// Note that unlike AllocaStmt, StackAllocaStmt does NOT have an 0 as
// initial value. Therefore here we push an initial 0 value.

How about enforce StackAllocaStmt to be zero initialized over backends like CC did in #1752?

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There's nothing needed to be done in the backends. The instruction pushing a zero is emitted into the IR and StackAllocaStmt only needs to create an empty stack.

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Merging this for #1752.

@archibate archibate merged commit dec1591 into taichi-dev:master Aug 28, 2020
@yuanming-hu yuanming-hu mentioned this pull request Sep 1, 2020
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[bug] [autodiff] Empty AdStack loaded
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