[Bug 1673434] Re: gcc 5.4.0-6ubuntu1~16.04.4 internal compiler error: in simplify_binary_operation_1, at simplify-rtx.c:3619

[Anton Blanchard]

Build with gcc -g -O2

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Title:
  gcc 5.4.0-6ubuntu1~16.04.4  internal compiler error: in
  simplify_binary_operation_1, at simplify-rtx.c:3619

Status in gcc-5 package in Ubuntu:
  New

Bug description:
  When building stress-ng (from git://kernel.ubuntu.com/cking/stress-ng)
  the PPA builder for Xenial with gcc 5.4.0-6ubuntu1~16.04.4 on ppc64el
  breaks with an internal compiler error when building vector math code
  with __int128_t types.

  cc -g -O3 -fstack-protector-strong -Wformat -Werror=format-security -Wall -Wextra -DVERSION="0.07.25" -O2 -std=gnu99 -DHAVE_APPARMOR -DHAVE_LIB_BSD -DHAVE_LIB_Z -DHAVE_LIB_CRYPT -DHAVE_LIB_RT -DHAVE_LIB_PTHREAD -DHAVE_LIB_SCTP -DHAVE_LIB_AIO -DHAVE_KEYUTILS_H -DHAVE_XATTR_H -DHAVE_SECCOMP_H -DHAVE_SYS_CAP_H -DHAVE_FLOAT_DECIMAL -DHAVE_VECMATH -DHAVE_ATOMIC -DHAVE_ASM_NOP -fno-builtin -c -o stress-vecmath.o stress-vecmath.c
  stress-vecmath.c: In function ‘stress_vecmath’:
  stress-vecmath.c:181:1: internal compiler error: in simplify_binary_operation_1, at simplify-rtx.c:3619
   }
   ^

  The source code that trips this issue:
  http://kernel.ubuntu.com/git/cking/stress-ng.git/tree/stress-vecmath.c

  This builds OK on Yakkety upwards.

  Attached is the full build log from the PPA.

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