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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/99908] SIMD: negating logical + if_else has a suboptimal
 codegen.
Date: Tue, 06 Apr 2021 09:41:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99908

--- 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])) =3D=3D MODE_VECTOR_INT
+   && GET_MODE_SIZE (GET_MODE (operands[3])) =3D=3D <MODE_SIZE>"
+  [(set (match_dup 0)
+       (unspec:VI1_AVX2
+         [(match_dup 2) (match_dup 1) (match_dup 4)]
+         UNSPEC_BLENDV))]
+  "operands[4] =3D gen_lowpart (<MODE>mode, operands[3]);")
+=