https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99908
--- Comment #2 from Hongtao.liu <crazylht at gmail dot com> ---
I'm testing
@@ -17759,6 +17759,35 @@ (define_insn "<sse4_1_avx2>_pblendvb"
(set_attr "btver2_decode" "vector,vector,vector")
(set_attr "mode" "<sseinsnmode>")])
+(define_split
+ [(set (match_operand:VI1_AVX2 0 "register_operand")
+ (unspec:VI1_AVX2
+ [(match_operand:VI1_AVX2 1 "vector_operand")
+ (match_operand:VI1_AVX2 2 "register_operand")
+ (not:VI1_AVX2 (match_operand:VI1_AVX2 3 "register_operand"))]
+ UNSPEC_BLENDV))]
+ "TARGET_SSE4_1"
+ [(set (match_dup 0)
+ (unspec:VI1_AVX2
+ [(match_dup 2) (match_dup 1) (match_dup 3)]
+ UNSPEC_BLENDV))])
+
+(define_split
+ [(set (match_operand:VI1_AVX2 0 "register_operand")
+ (unspec:VI1_AVX2
+ [(match_operand:VI1_AVX2 1 "vector_operand")
+ (match_operand:VI1_AVX2 2 "register_operand")
+ (subreg:VI1_AVX2 (not (match_operand 3 "register_operand")) 0)]
+ UNSPEC_BLENDV))]
+ "TARGET_SSE4_1
+ && GET_MODE_CLASS (GET_MODE (operands[3])) == MODE_VECTOR_INT
+ && GET_MODE_SIZE (GET_MODE (operands[3])) == <MODE_SIZE>"
+ [(set (match_dup 0)
+ (unspec:VI1_AVX2
+ [(match_dup 2) (match_dup 1) (match_dup 4)]
+ UNSPEC_BLENDV))]
+ "operands[4] = gen_lowpart (<MODE>mode, operands[3]);")
+
