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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug target/94962] Suboptimal AVX2 code for _mm256_zextsi128_si256(_mm_set1_epi8(-1)) Date: Mon, 18 May 2020 08:41:45 +0000 [thread overview] Message-ID: <bug-94962-4-oW47mR6ZaU@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-94962-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94962 Hongtao.liu <crazylht at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |crazylht at gmail dot com --- Comment #1 from Hongtao.liu <crazylht at gmail dot com> --- redudant vmovdaq xmm0, xmm0 is generated by ---- (insn:TI 7 6 14 2 (set (reg:V8SI 20 xmm0 [84]) (vec_concat:V8SI (reg:V4SI 20 xmm0 [86]) (const_vector:V4SI [ (const_int 0 [0]) repeated x4 ]))) "/export/users2/liuhongt/install/gcc10_trunk/lib/gcc/x86_64-pc-linux-gnu/10.0.1/include/avxintrin.h":770:20 5296 {avx_vec_concatv8si} (expr_list:REG_EQUIV (const_vector:V8SI [ (const_int -1 [0xffffffffffffffff]) repeated x4 (const_int 0 [0]) repeated x4 ]) (nil))) ----- could be eliminated if src operand has same regno as dest operand. --- diff --git a/gcc/config/i386/sse.md b/gcc/config/i386/sse.md index 7a7ecd4be87..4ff4cf55f74 100644 --- a/gcc/config/i386/sse.md +++ b/gcc/config/i386/sse.md @@ -21123,6 +21123,9 @@ } case 2: case 3: + if (register_operand (operands[1], <ssehalfvecmode>MODE) + && REGNO (operands[1]) == REGNO (operand[0])) + return ""; switch (get_attr_mode (insn)) { case MODE_V16SF: ---
next prev parent reply other threads:[~2020-05-18 8:41 UTC|newest] Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-05-05 21:41 [Bug tree-optimization/94962] New: " nemo@self-evident.org 2020-05-18 8:41 ` crazylht at gmail dot com [this message] 2020-05-18 9:37 ` [Bug target/94962] " jakub at gcc dot gnu.org 2020-05-18 9:55 ` crazylht at gmail dot com 2020-05-18 10:01 ` crazylht at gmail dot com 2020-05-18 15:43 ` nemo@self-evident.org 2020-05-19 6:14 ` crazylht at gmail dot com 2020-05-19 16:39 ` nemo@self-evident.org 2022-09-23 5:29 ` cvs-commit at gcc dot gnu.org 2022-09-23 5:32 ` crazylht at gmail dot com 2022-09-26 5:30 ` cvs-commit at gcc dot gnu.org
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