[all-commits] [llvm/llvm-project] d7fed7: [AArch64][GlobalISel] Fall back if disabling neon/...

[Amara Emerson via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d7fed7b8994eb239cde727eb826d6fa43732e7a5
      https://github.com/llvm/llvm-project/commit/d7fed7b8994eb239cde727eb826d6fa43732e7a5
  Author: Amara Emerson <amara at apple.com>
  Date:   2021-03-17 (Wed, 17 Mar 2021)

  Changed paths:
    M llvm/include/llvm/CodeGen/GlobalISel/CallLowering.h
    M llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
    M llvm/lib/Target/AArch64/GISel/AArch64CallLowering.cpp
    M llvm/lib/Target/AArch64/GISel/AArch64CallLowering.h
    M llvm/test/CodeGen/AArch64/GlobalISel/no-neon-no-fp.ll

  Log Message:
  -----------
  [AArch64][GlobalISel] Fall back if disabling neon/fp in the translator.

The previous technique relied on early-exiting the legalizer predicate
initialization, leaving an empty rule table. That causes a fallback
for most instructions, but some have legacy rules defined like G_ZEXT
which can try continue, but then crash.

We should fall back earlier, in the translator, to avoid this issue.

Differential Revision: https://reviews.llvm.org/D98730