[all-commits] [llvm/llvm-project] 8fc0ac: [SCEV] Support larger than 64-bit types in ashr(ad...

[Björn Pettersson via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8fc0aca5d1c12482d72fc412cea975de330a78b4
      https://github.com/llvm/llvm-project/commit/8fc0aca5d1c12482d72fc412cea975de330a78b4
  Author: Björn Pettersson <bjorn.a.pettersson at ericsson.com>
  Date:   2023-11-08 (Wed, 08 Nov 2023)

  Changed paths:
    M llvm/lib/Analysis/ScalarEvolution.cpp
    M llvm/test/Analysis/ScalarEvolution/sext-add-inreg.ll

  Log Message:
  -----------
  [SCEV] Support larger than 64-bit types in ashr(add(shl(x, n), c), m) (#71600)

In commit 5a9a02f67b771fb2edcf06 scalar evolution got support for
computing SCEV:s for (ashr(add(shl(x, n), c), m)) constructs. The code
however used APInt::getZExtValue without first checking that the APInt
would fit inside an uint64_t. When for example using 128-bit types we
ended up in assertion failures (or maybe miscompiles in non-assert
builds).
This patch simply avoid converting from APInt to uint64_t when creating
the truncated constant. We can just truncate the APInt instead.