[all-commits] [llvm/llvm-project] a6a56a: [libclc] erfc: fix fp32 implementation in FTZ mode...

[Romaric Jodin via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a6a56a326a3c209e19927942595877aceea368b7
      https://github.com/llvm/llvm-project/commit/a6a56a326a3c209e19927942595877aceea368b7
  Author: Romaric Jodin <rjodin at chromium.org>
  Date:   2025-03-24 (Mon, 24 Mar 2025)

  Changed paths:
    M libclc/generic/lib/math/erf.cl
    M libclc/generic/lib/math/erfc.cl

  Log Message:
  -----------
  [libclc] erfc: fix fp32 implementation in FTZ mode (#132390)

On some implementations, the current implementation leads to slight
accuracy issues.

While the maths behind this implementation is correct, it does not take
into account the accumulation of errors coming from other operators that
do not provide correct rounding (like the exp function).

To avoid it, compute statically exp(-0.5625).

Fixes #124939



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