[llvm-bugs] [Bug 43139] New: SIMD: various "error in backend: Cannot select..."

via llvm-bugs llvm-bugs at lists.llvm.org
Wed Aug 28 02:56:30 PDT 2019


            Bug ID: 43139
           Summary: SIMD: various "error in backend: Cannot select..."
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: eustas.ru at gmail.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

Created attachment 22443
  --> https://bugs.llvm.org/attachment.cgi?id=22443&action=edit
preprocessed source

Checked on several builds from version 8.0.0 (trunk 342117) to 9.0.0 (trunk
Error location / "bad" instruction changes with slight code modifications.

Example output:

fatal error: error in backend: Cannot select: 0x9615a38: v4f32 =
X86ISD::VRNDSCALE 0x974aa80, Constant:i32<8>
  0x974aa80: v4f32,ch = CopyFromReg 0x64fc3b8, Register:v4f32 %82
    0x9803138: v4f32 = Register %82
  0x9750920: i32 = Constant<8>
In function:
clang: error: clang frontend command failed with exit code 70 (use -v to see
clang version 9.0.0 (trunk 366207)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin

Preprocessed source and script attached.

Steps to reproduce (using git and docker):

git clone https://github.com/eustas/2im.git
cd 2im
git checkout b39f82e4f6bf7a2e2a491e3cabaa53641e5e332a
docker run -it -v `pwd`/c:/c --entrypoint=/bin/bash
gcr.io/cloud-marketplace-containers/google/bazel at sha256:707089be09a8d4c28c140dc943d4e8b5757fa8ae10c2753063951a087ae83168
# entered the container
cd /c/
bazel build :main
# leave the container

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