[Bug tree-optimization/68961] [6 regression] Test case gcc.target/powerpc/pr60203.c fails since r231674

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68961

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Martin Sebor from comment #4)
> Confirmed on powerpc64le:
> 
> $ /build/gcc-trunk/gcc/xgcc -B /build/gcc-trunk/gcc -O3 -S -Wall -Wextra
> -Wpedantic -mcpu=power8 -o/dev/stdout
> /src/gcc/trunk/gcc/testsuite/gcc.target/powerpc/pr60203.c
> 	.file	"pr60203.c"
> 	.machine power8
> 	.abiversion 2
> 	.section	".toc","aw"
> 	.section	".text"
> 	.align 2
> 	.p2align 4,,15
> 	.globl pack
> 	.type	pack, @function
> pack:
> 	xxpermdi 0,2,1,0
> 	addi 9,1,-16
> 	xxpermdi 0,0,0,2
> 	stxvd2x 0,0,9
> 	lfd 1,-16(1)
> 	lfd 2,-8(1)
> 	blr
> 	.long 0
> 	.byte 0,0,0,0,0,0,0,0
> 	.size	pack,.-pack
> 	.align 2
> 	.p2align 4,,15
> 	.globl unpack_0
> 	.type	unpack_0, @function
> unpack_0:
> 	blr
> 	.long 0
> 	.byte 0,0,0,0,0,0,0,0
> 	.size	unpack_0,.-unpack_0
> 	.align 2
> 	.p2align 4,,15
> 	.globl unpack_1
> 	.type	unpack_1, @function
> unpack_1:
> 	fmr 1,2
> 	blr
> 	.long 0
> 	.byte 0,0,0,0,0,0,0,0
> 	.size	unpack_1,.-unpack_1
> 	.ident	"GCC: (GNU) 6.0.0 20160113 (experimental)"
> 	.section	.note.GNU-stack,"",@progbits

Can you properly bisect it then?  Still can't reproduce with a cross from
x86_64.

Does on native .0341.fre properly contain just

pack (double a, double aa)
{
  double u$d$0;
  union u_ld u;

  <bb 2>:
  u.d[1] = aa_4(D);
  u ={v} {CLOBBER};
  return a_2(D);

}

or do we have some odd host dependency in early opts until here?