PR target/19010
        * config/i386/i386.c (ix86_must_pass_in_stack): Don't return true
        for TImode vectors.
        (gen_reg_or_parallel): New.
        (function_arg): Use it.
        (ix86_hard_regno_mode_ok): Test SSE1 and SSE2 separately,
        MMX and 3DNOW separately.
        (ix86_rtx_costs): Simplify FLOAT_EXTEND case.
        (ix86_vector_mode_supported_p): Test SSE1 and SSE2 separately.
        * config/i386/i386.h (VALID_SSE2_REG_MODE): Move SSE2 cases from ...
        (VALID_SSE_REG_MODE): ... here.

        * gcc.target/i386/i386.exp: New harness.
        * gcc.target/i386/vect-args.c: New.

From-SVN: r92205