[Bug 1642109] Re: internal compiler error: in expand_debug_locations, at cfgexpand.c:5118

[Matthias Klose]

not reproducible:

$ g++ -finline-functions -m64 -O3 -c -g -MMD -MP -MF "main.o.d" -o main.o main.cpp
main.cpp: In function 'void p(AV)':
main.cpp:80:6: note: The ABI for passing parameters with 32-byte alignment has changed in GCC 4.6
 void p(union AV a) {
      ^


** Changed in: gcc-5 (Ubuntu)
       Status: New => Incomplete

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Title:
  internal compiler error: in expand_debug_locations, at
  cfgexpand.c:5118

Status in gcc-5 package in Ubuntu:
  Incomplete

Bug description:
  Hi,
  I'm getting subject error when compiling attached code with options

  g++ -finline-functions -m64 -O3 -c -g -MMD -MP -MF "main.o.d" -o
  main.o main.cpp

  Using:  gcc (Ubuntu 5.4.0-6ubuntu1~16.04.4) 5.4.0 20160609
  System: Ubuntu 16.04

  The error asked me to "Please submit a full bug report,"

  This is a cut down example from a larger program. I'm compiling larger
  program with -m64 and have SIMD routines for SSE, AVX & AVX2

  The problem goes away if I
  1. Remove -O option or,
  2. Remove the -g option (but I do want both of these for profiling) or,
  3. Add explicit inline to
      inline __attribute__ ((target ("avx2"))) __m256i _mm256_shift_left(__m256i a, int n) and
      inline __attribute__ ((target ("avx2"))) __m256i _mm256_shift_right(__m256i a, int n)

  I love gcc and was so happy when I found __attribute__ ((target
  ("avx2"))) option. Keep up the good work.

  Thanks, Colin
  PS. The routines __m256i _mm256_shift_[left|right](__m256i a, int n) are used in initialisation preceding a large loop and performance doesn't really matter. I'm sure they can be done better.

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