x86: Check mode of pseudo register push

x86: Check mode of pseudo register push

commit 266f44a91c0c9705d3d18e82d7c5bab32927a18f
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Sun May 17 10:10:34 2020 -0700

    x86: Allow V1TI vector register pushes

    Add V1TI vector register push and split it after reload to a sequence
    of:

    (set (reg:P SP_REG) (plus:P SP_REG) (const_int -8)))
    (set (match_dup 0) (match_dup 1))

added a pseudo register push check.  But

(insn 13 12 14 3 (set (mem:SI (pre_dec:SI (reg/f:SI 7 sp)) [0  S4 A32])
        (reg/v:SI 87 [ srclen ])) "x.c":37:16 54 {*pushsi2}
     (expr_list:REG_DEAD (reg/v:SI 87 [ srclen ])
        (expr_list:REG_ARGS_SIZE (const_int 4 [0x4])
            (nil))))

is not a pseudo register push.  In 64-bit mode, mode of pseudo register
push is TImode.  In 32-bit mode, it is DImode.  Add pseudo register push
mode check to pseudo_reg_set.

gcc/

	PR target/98161
	* config/i386/i386-features.c (pseudo_reg_set): Check mode of
	pseudo register push.

gcc/testsuite/

	* gcc.target/i386/pr98161.c: New test.