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From: "bernd.edlinger at hotmail dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/100106] [10/11 Regression] ICE in gen_movdi, at
 config/arm/arm.md:6187 since r10-2840-g70cdb21e
Date: Tue, 20 Apr 2021 06:00:43 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100106

--- Comment #3 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
Yes, indeed something like the following seems to fix the issue:

diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c
index d13c390..56271e9 100644
--- a/gcc/simplify-rtx.c
+++ b/gcc/simplify-rtx.c
@@ -7217,6 +7217,7 @@ simplify_context::simplify_subreg (machine_mode outer=
mode
          have instruction to move the whole thing.  */
       && (! MEM_VOLATILE_P (op)
          || ! have_insn_for (SET, innermode))
+      && (STRICT_ALIGNMENT && GET_MODE_ALIGNMENT (outermode) < MEM_ALIGN (=
op))
       && known_le (outersize, innersize))
     return adjust_address_nv (op, outermode, byte);=