K 10
svn:author
V 3
dim
K 8
svn:date
V 27
2023-06-01T19:18:37.085465Z
K 7
svn:log
V 1684
Apply clang fixes for crashes compiling ARM/AArch64 CRC intrinsics

Merge commit 069ecd0c6e2c from llvm-project (by Fangrui Song):

  [ARM] Check target feature support for __builtin_arm_crc*

  `__builtin_arm_crc*` requires the target feature crc which is available on armv8
  and above. Calling the fuctions for armv7 leads to a SelectionDAG crash.

  ```
  % clang -c --target=armv7-unknown-linux-gnueabi -c a.c
  fatal error: error in backend: Cannot select: intrinsic %llvm.arm.crc32b
  PLEASE submit a bug report to ...
  ```

  Add `TARGET_BUILTIN` and define required features for these builtins to
  report an error in `CodeGenFunction::checkTargetFeatures`. The problem is quite widespread.
  I will add `TARGET_BUILTIN` for more builtins later.

  Fix https://github.com/llvm/llvm-project/issues/57802

  Differential Revision: https://reviews.llvm.org/D134127

Merge commit b2d7a0dcf1ff from llvm-project (by Fangrui Song):

  [AArch64] Check target feature support for __builtin_arm_crc*

  This is the AArch64 counterpart of D134127.
  Daniel Kiss will change more `BUILTIN` to `TARGET_BUILTIN`.

  Fix #57802

Note that programs attempting to use ARM/AArch64 CRC intrinsics, when
they are not supported by the targeted CPU, will still receive a regular
compilation error (instead of a fatal backend error) similar to:

  7zCrc.c:4:10: error: '__builtin_arm_crc32b' needs target feature crc
    return __builtin_arm_crc32b(a, b);
           ^

Reported by:	Alastair Hogge <agh@riseup.net>
PR:		271624
MFC after:	3 days

(cherry picked from commit 8792c03886d9e6df10fbac825819603dc059c7ea)

Git Hash:   dbbac83e39faca07c6081cd549128c253861cdac
Git Author: dim@FreeBSD.org
END