[llvm-bugs] [Bug 38001] New: Reading a 8-byte aligned f128 emits a movaps instruction

via llvm-bugs llvm-bugs at lists.llvm.org
Sat Jun 30 06:01:20 PDT 2018


            Bug ID: 38001
           Summary: Reading a 8-byte aligned f128 emits a movaps
           Product: tools
           Version: 6.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: llc
          Assignee: unassignedbugs at nondot.org
          Reporter: eduardosanchezmunoz at gmail.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 20496
  --> https://bugs.llvm.org/attachment.cgi?id=20496&action=edit
Example LLVM IR

Using load on a f128 with align 8 emits a movaps instruction (on x86-64 with
mmx), which expects a 16-byte aligned address.

An example IR is attached. It can be compiled with
llc -march=x86-64 -mattr=+mmx -O1 movaps.ll

The output of llc -version is:
LLVM (http://llvm.org/):
  LLVM version 6.0.0
  Optimized build.
  Default target: x86_64-pc-linux-gnu
  Host CPU: skylake

  Registered Targets:
    aarch64    - AArch64 (little endian)
    aarch64_be - AArch64 (big endian)
    amdgcn     - AMD GCN GPUs
    arm        - ARM
    arm64      - ARM64 (little endian)
    armeb      - ARM (big endian)
    bpf        - BPF (host endian)
    bpfeb      - BPF (big endian)
    bpfel      - BPF (little endian)
    hexagon    - Hexagon
    lanai      - Lanai
    mips       - Mips
    mips64     - Mips64 [experimental]
    mips64el   - Mips64el [experimental]
    mipsel     - Mipsel
    msp430     - MSP430 [experimental]
    nvptx      - NVIDIA PTX 32-bit
    nvptx64    - NVIDIA PTX 64-bit
    ppc32      - PowerPC 32
    ppc64      - PowerPC 64
    ppc64le    - PowerPC 64 LE
    r600       - AMD GPUs HD2XXX-HD6XXX
    sparc      - Sparc
    sparcel    - Sparc LE
    sparcv9    - Sparc V9
    systemz    - SystemZ
    thumb      - Thumb
    thumbeb    - Thumb (big endian)
    x86        - 32-bit X86: Pentium-Pro and above
    x86-64     - 64-bit X86: EM64T and AMD64
    xcore      - XCore

I have installed LLVM from Manjaro repositories.

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