[all-commits] [llvm/llvm-project] 6d5697: [SystemZ] Fix ICE with i128->i64 uaddo carry chain

[Ulrich Weigand via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6d5697f7cb4e933d2f176c46b7ac05a9cbaeb8b6
      https://github.com/llvm/llvm-project/commit/6d5697f7cb4e933d2f176c46b7ac05a9cbaeb8b6
  Author: Ulrich Weigand <ulrich.weigand at de.ibm.com>
  Date:   2025-01-23 (Thu, 23 Jan 2025)

  Changed paths:
    M llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
    A llvm/test/CodeGen/SystemZ/pr124001.ll

  Log Message:
  -----------
  [SystemZ] Fix ICE with i128->i64 uaddo carry chain

We can only optimize a uaddo_carry via specialized instruction
if the carry was produced by another uaddo(_carry) instruction;
there is already a check for that.

However, i128 uaddo(_carry) use a completely different mechanism;
they indicate carry in a vector register instead of the CC flag.
Thus, we must also check that we don't mix those two - that check
has been missing.

Fixes: https://github.com/llvm/llvm-project/issues/124001



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