Bug 232911

Summary:

Assembly code crashes clang

Product:

Base System

Reporter:

Yuri Victorovich <yuri>

Component:

standards

Assignee:

freebsd-toolchain (Nobody) <toolchain>

Status:

Closed FIXED

Severity:

Affects Only Me

CC:

dim

Priority:

---

Version:

CURRENT

Hardware:

Any

OS:

Any

URL:

https://bugs.llvm.org/show_bug.cgi?id=39539

Attachments:

Description	Flags
c++ testcase	none

Description Yuri Victorovich freebsd_committer

2018-11-02 16:15:34 UTC

Created attachment 198890 [details]
c++ testcase

The attached testcase crashes base clang, and clang60 and clang70.

Source: the upstream author of one github project reported it: https://github.com/sadko4u/lsp-plugins/issues/10#issuecomment-435305805

Comment 1 Gerald Pfeifer freebsd_committer

2018-11-04 11:19:27 UTC

Reassigning to toolchain@ ; not that the upstream bug reported by Yuri
(thanks!) now has a much smaller reproducer.

Comment 2 commit-hook freebsd_committer

2020-10-05 18:09:15 UTC

A commit references this bug:

Author: dim
Date: Mon Oct  5 18:08:54 UTC 2020
New revision: 366452
URL: https://svnweb.freebsd.org/changeset/base/366452

Log:
  Merge commit 0fac1c191 from llvm git (by Craig Topper):

    [X86] Allow Yz inline assembly constraint to choose ymm0 or zmm0 when
    avx/avx512 are enabled and type is 256 or 512 bits

    gcc supports selecting ymm0/zmm0 for the Yz constraint when used with
    256 or 512 bit vector types.

    Fixes PR45806

    Differential Revision: https://reviews.llvm.org/D79448

  This should fix 'fatal error: error in backend: Cannot select' errors if
  assertions are disabled, or 'Assertion failed: (isVector() && "Invalid
  vector type!"), function getVectorNumElements, file
  /usr/src/contrib/llvm-project/llvm/include/llvm/CodeGen/ValueTypes.h,
  line 276.', when building the audio/lsp-plugins-lv2 port.

  Direct commit to stable/{11,12} since head has clang 11.0.0, which
  already includes this fix.

  Reported by:	yuri
  PR:		232911

Changes:
  stable/11/contrib/llvm-project/clang/lib/Basic/Targets/X86.cpp
  stable/11/contrib/llvm-project/llvm/lib/Target/X86/X86ISelLowering.cpp
  stable/12/contrib/llvm-project/clang/lib/Basic/Targets/X86.cpp
  stable/12/contrib/llvm-project/llvm/lib/Target/X86/X86ISelLowering.cpp