https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89803
--- Comment #1 from Hongtao.liu <crazylht at gmail dot com> ---
Also we can use constraint "vm" instead of "v" for vfpclassp[sd] instructions.
ndex: gcc/config/i386/sse.md
===================================================================
--- gcc/config/i386/sse.md (revision 269868)
+++ gcc/config/i386/sse.md (working copy)
@@ -21101,7 +21101,7 @@
(define_insn "avx512dq_fpclass<mode><mask_scalar_merge_name>"
[(set (match_operand:<avx512fmaskmode> 0 "register_operand" "=k")
(unspec:<avx512fmaskmode>
- [(match_operand:VF_AVX512VL 1 "register_operand" "v")
+ [(match_operand:VF_AVX512VL 1 "register_operand" "vm")
(match_operand:QI 2 "const_0_to_255_operand" "n")]
UNSPEC_FPCLASS))]
"TARGET_AVX512DQ"
