aarch64: Extend the offset limit in "symbol + offset" from 1MB to 16MB

This patch allows using an offset of up to 16MB in "symbol + offset",
instead of 1MB limit that was used previously.

gcc/ChangeLog:

	* config/aarch64/aarch64.cc (aarch64_load_symref_appropriately):
	Update.

1 files changed, 15 insertions, 0 deletions

diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc
index e5e993d..a2945f7 100644
--- a/gcc/config/aarch64/aarch64.cc
+++ b/gcc/config/aarch64/aarch64.cc
@@ -3030,7 +3030,22 @@ aarch64_load_symref_appropriately (rtx dest, rtx imm,
 	if (can_create_pseudo_p ())
 	  tmp_reg = gen_reg_rtx (mode);
 
+	HOST_WIDE_INT mid_const = 0;
+	if (TARGET_PECOFF)
+	  {
+	    poly_int64 offset;
+	    strip_offset (imm, &offset);
+
+	    HOST_WIDE_INT const_offset;
+	    if (offset.is_constant (&const_offset))
+	      /* Written this way for the sake of negative offsets.  */
+	      mid_const = const_offset / (1 << 20) * (1 << 20);
+	  }
+	imm = plus_constant (mode, imm, -mid_const);
+
 	emit_move_insn (tmp_reg, gen_rtx_HIGH (mode, copy_rtx (imm)));
+	if (mid_const)
+	  emit_set_insn (tmp_reg, plus_constant (mode, tmp_reg, mid_const));
 	emit_insn (gen_add_losym (dest, tmp_reg, imm));
 	return;
       }