arm: Generate correct const_ints (PR86640)

In arm_block_set_aligned_vect 8-bit constants are generated as zero-
extended const_ints, not sign-extended as required.  Fix that.


	PR target/86640
	* config/arm/arm.c (arm_block_set_aligned_vect): Use gen_int_mode
	instead of GEN_INT.

From-SVN: r263075

gcc/ChangeLog

+2018-07-30  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	PR target/86640
+	* config/arm/arm.c (arm_block_set_aligned_vect): Use gen_int_mode
+	instead of GEN_INT.
+
 2018-07-30  Bernd Edlinger  <bernd.edlinger@hotmail.de>
 
 	* tree-ssa-forwprop.c (simplify_builtin_call): Don't create a not NUL

gcc/config/arm/arm.c

@@ -30046,7 +30046,6 @@ arm_block_set_aligned_vect (rtx dstbase,
   rtx dst, addr, mem;
   rtx val_vec, reg;
   machine_mode mode;
-  unsigned HOST_WIDE_INT v = value;
   unsigned int offset = 0;
 
   gcc_assert ((align & 0x3) == 0);
@@ -30065,10 +30064,8 @@ arm_block_set_aligned_vect (rtx dstbase,
 
   dst = copy_addr_to_reg (XEXP (dstbase, 0));
 
-  v = sext_hwi (v, BITS_PER_WORD);
-
   reg = gen_reg_rtx (mode);
-  val_vec = gen_const_vec_duplicate (mode, GEN_INT (v));
+  val_vec = gen_const_vec_duplicate (mode, gen_int_mode (value, QImode));
   /* Emit instruction loading the constant value.  */
   emit_move_insn (reg, val_vec);