[Bug tree-optimization/91204] [10 Regression] ICE in expand_expr_real_2, at expr.c:9215 with -O3

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91204

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
--- gcc/optabs.c.jj     2019-07-15 10:53:10.743205405 +0200
+++ gcc/optabs.c        2019-07-19 00:38:20.271852242 +0200
@@ -2972,6 +2972,17 @@ expand_unop (machine_mode mode, optab un
       return target;
     }

+  /* Emit ~op0 as op0 ^ -1.  */
+  if (unoptab == one_cmpl_optab
+      && (SCALAR_INT_MODE_P (mode) || GET_MODE_CLASS (mode) ==
MODE_VECTOR_INT)
+      && optab_handler (xor_optab, mode) != CODE_FOR_nothing)
+    {
+      temp = expand_binop (mode, xor_optab, op0, CONSTM1_RTX (mode),
+                          target, unsignedp, OPTAB_DIRECT);
+      if (temp)
+       return temp;
+    }
+
   if (optab_to_code (unoptab) == NEG)
     {
       /* Try negating floating point values by flipping the sign bit.  */

seems to work for me.  Or of course something similar can be done in
config/i386/mmx.md, basically copy the sse.md one_cmpl<mode>2 pattern to mmx.md
with TARGET_MMX_WITH_SSE and MMXMODEI iterator.