Hi,

the test fails at -O2 because of the assertion recently added to gen_reg_rtx 
that crtl->emit.regno_pointer_align_length is non-zero.  Now the function 
expand_vec_perm_interleave_2 can be invoked at the GIMPLE level in "testing" 
mode and crtl->emit is not initialized by that time.

Tested on ia64-linux-gnu, OK for mainline and 4.9 branch?


2015-03-03  Eric Botcazou  <ebotcazou@adacore.com>

	* config/ia64/ia64.c (expand_vec_perm_interleave_2): Use gen_raw_REG
	to create a register in testing mode.


-- 
Eric Botcazou