We unshare all RTL created during expansion, but when
aarch64_load_symref_appropriately is called after expansion like in the
following testcases, we use imm in both HIGH and LO_SUM operands.
If imm is some RTL that shouldn't be shared like a non-sharable CONST,
we get at least with --enable-checking=rtl a checking ICE, otherwise might
just get silently wrong code.
The following patch fixes that by copying it if it can't be shared.
2022-03-16 Jakub Jelinek <jakub@redhat.com>
PR target/104910
* config/aarch64/aarch64.c (aarch64_load_symref_appropriately): Copy
imm rtx.
* gcc.dg/pr104910.c: New test.
(cherry picked from commit
952155629ca1a4dfe7c7b26e53d118a9b853ed4a)
if (can_create_pseudo_p ())
tmp_reg = gen_reg_rtx (mode);
- emit_move_insn (tmp_reg, gen_rtx_HIGH (mode, imm));
+ emit_move_insn (tmp_reg, gen_rtx_HIGH (mode, copy_rtx (imm)));
emit_insn (gen_add_losym (dest, tmp_reg, imm));
return;
}
--- /dev/null
+/* PR target/104910 */
+/* { dg-do compile } */
+/* { dg-options "-Os -fno-forward-propagate" } */
+/* { dg-additional-options "-fstack-protector-all" { target fstack_protector } } */
+
+void
+bar (void);
+
+void
+foo (int x)
+{
+ if (x)
+ bar ();
+}