On Fri, Jul 1, 2011 at 12:50 AM, H.J. Lu <hongjiu.lu@intel.com> wrote:
> In one SSE2 int->float split, when TARGET_USE_VECTOR_CONVERTS is true,
> TARGET_INTER_UNIT_MOVES is false and GENERAL_REG_P (op1) is true. we
> will get gcc_unreachable.  This patch removes TARGET_INTER_UNIT_MOVES
> check.  OK for trunk?

This will result in register allocation failure. Operand 0 of
sse2_loadld pattern has conditional constraint Yi that depends on
TARGET_INTER_UNIT_MOVES, so we can't blindly generate sse2_loadld
after reload.  I'm testing attached patch.

BTW: Do you perhaps have a testcase for this problem?

2011-07-03  Uros Bizjak  <ubizjak@gmail.com>

	PR target/49600
	* config/i386/i386.md (SSE2 int->float split): Push operand 1 in
	general register to memory for !TARGET_INTER_UNIT_MOVES.

Thanks,
Uros.