Simplify LRA lowpart subreg fix

r257177 made the else arms equivalent to the if arms.

2018-02-08  Richard Sandiford  <richard.sandiford@linaro.org>

gcc/
	* lra-constraints.c (match_reload): Unconditionally use
	gen_lowpart_SUBREG, rather than selecting between that
	and equivalent gen_rtx_SUBREG code.

From-SVN: r257488

gcc/ChangeLog

+2018-02-08  Richard Sandiford  <richard.sandiford@linaro.org>
+
+	* lra-constraints.c (match_reload): Unconditionally use
+	gen_lowpart_SUBREG, rather than selecting between that
+	and equivalent gen_rtx_SUBREG code.
+
 2018-02-08  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/84233

gcc/lra-constraints.c

@@ -942,13 +942,7 @@ match_reload (signed char out, signed char *ins, signed char *outs,
 	  reg = new_in_reg
 	    = lra_create_new_reg_with_unique_value (inmode, in_rtx,
 						    goal_class, "");
-	  if (SCALAR_INT_MODE_P (inmode))
-	    new_out_reg = gen_lowpart_SUBREG (outmode, reg);
-	  else
-	    {
-	      poly_uint64 offset = subreg_lowpart_offset (outmode, inmode);
-	      new_out_reg = gen_rtx_SUBREG (outmode, reg, offset);
-	    }
+	  new_out_reg = gen_lowpart_SUBREG (outmode, reg);
 	  LRA_SUBREG_P (new_out_reg) = 1;
 	  /* If the input reg is dying here, we can use the same hard
 	     register for REG and IN_RTX.  We do it only for original
@@ -965,13 +959,7 @@ match_reload (signed char out, signed char *ins, signed char *outs,
 	  reg = new_out_reg
 	    = lra_create_new_reg_with_unique_value (outmode, out_rtx,
 						    goal_class, "");
-	  if (SCALAR_INT_MODE_P (outmode))
-	    new_in_reg = gen_lowpart_SUBREG (inmode, reg);
-	  else
-	    {
-	      poly_uint64 offset = subreg_lowpart_offset (inmode, outmode);
-	      new_in_reg = gen_rtx_SUBREG (inmode, reg, offset);
-	    }
+	  new_in_reg = gen_lowpart_SUBREG (inmode, reg);
 	  /* NEW_IN_REG is non-paradoxical subreg.  We don't want
 	     NEW_OUT_REG living above.  We add clobber clause for
 	     this.  This is just a temporary clobber.  We can remove