[Bug target/112681] [14 Regression] ICE: in extract_insn, at recog.cc:2804 (unrecognizable insn) with -O2 -mfma -mno-sse4.2 and memcmp() since r14-5747

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112681

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Flags can be just -O2 -msse4.1 -mno-sse4.2 as well or even -O2 -msse4.2
-mno-avx.
--- gcc/config/i386/i386-expand.cc.jj   2023-11-21 09:31:35.792395304 +0100
+++ gcc/config/i386/i386-expand.cc      2023-11-23 20:43:51.675586034 +0100
@@ -2453,6 +2453,8 @@ ix86_expand_branch (enum rtx_code code,
          /* Generate XOR since we can't check that one operand is zero
             vector.  */
          tmp = gen_reg_rtx (mode);
+         if (!vector_operand (op1, mode))
+           op1 = force_reg (mode, op1);
          emit_insn (gen_rtx_SET (tmp, gen_rtx_XOR (mode, op0, op1)));
          tmp = gen_lowpart (p_mode, tmp);
          emit_insn (gen_rtx_SET (gen_rtx_REG (CCZmode, FLAGS_REG),
seems to fix it.