[Bug target/125728] M68k: m68k-elf-gcc generates code that raises address error exception in certain circumstances

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125728

--- Comment #2 from Mikael Pettersson <mikpelinux at gmail dot com> ---
The difference is first seen in .305r.late_combine1:

-(insn 6 5 7 2 (set (reg:QI 37 [ _5 ])
-        (and:QI (mem/c:QI (symbol_ref:SI ("foo") [flags 0x2]  <var_decl
0x7fbbc7478980 foo>) [0 foo+0 S1 A16])
-            (const_int 7 [0x7]))) "/tmp/pr125728.c":6:20 251 {andqi3}
+(insn 7 5 8 2 (set (reg:SI 38 [ _2 ])
+        (and:SI (mem/c:SI (const:SI (plus:SI (symbol_ref:SI ("foo") [flags
0x2]  <var_decl 0x7fcd5e89b980 foo>)
+                        (const_int -3 [0xfffffffffffffffd]))) [0 foo+-3 S4
A8])
+            (const_int 7 [0x7]))) "/tmp/pr125728.c":6:20 246 {andsi3_internal}
      (nil))
-(insn 7 6 8 2 (set (reg:SI 38 [ _2 ])
-        (zero_extend:SI (reg:QI 37 [ _5 ]))) "/tmp/pr125728.c":6:20 90
{zero_extendqisi2}
-     (expr_list:REG_DEAD (reg:QI 37 [ _5 ])
-        (nil)))

That (mem:SI (const:SI (plus:SI (symbol_ref:SI ("foo")) (const_int -3)))) is
clearly invalid on a strict-alignment target.