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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/100738] New: Gimple failed to simplify ((v4si) ~a) < 0 ? c : d to ((v4si)a) >= 0 ? c : d Date: Mon, 24 May 2021 08:21:42 +0000 [thread overview] Message-ID: <bug-100738-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100738 Bug ID: 100738 Summary: Gimple failed to simplify ((v4si) ~a) < 0 ? c : d to ((v4si)a) >= 0 ? c : d Product: gcc Version: 12.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: middle-end Assignee: unassigned at gcc dot gnu.org Reporter: crazylht at gmail dot com CC: hjl.tools at gmail dot com Target Milestone: --- Host: x86_64-pc-linux-gnu Target: x86_64-*-* i?86-*-* cat test.c typedef int v4si __attribute__((vector_size (16))); typedef char v16qi __attribute__((vector_size (16))); v4si foo (v16qi a, v4si b, v4si c, v4si d) { return ((v4si)~a) < 0 ? c : d; } gcc -Ofast -mavx2 foo(char __vector(16), int __vector(4), int __vector(4), int __vector(4)): vpcmpeqd %xmm1, %xmm1, %xmm1 vpxor %xmm1, %xmm0, %xmm0 vblendvps %xmm0, %xmm2, %xmm3, %xmm0 ret it can be better with vblendvps xmm0, xmm3, xmm2, xmm0 gimple failed to simplify ((v4si)~a) < 0 ? c : d to ((v4si)a) >= 0 ? c : d With https://gcc.gnu.org/pipermail/gcc-patches/2021-May/571056.html, i observe rtl also won't simplify things like (vec_merge op1 op2 (lt (subreg (not op3) 0) const0_rtx)) to (vec_merge op2 op1 (lt (subreg op3 0) const0_rtx))
next reply other threads:[~2021-05-24 8:21 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-05-24 8:21 crazylht at gmail dot com [this message] 2021-05-24 8:59 ` [Bug middle-end/100738] " pinskia at gcc dot gnu.org 2021-05-25 7:39 ` rguenth at gcc dot gnu.org 2021-05-26 10:48 ` crazylht at gmail dot com 2021-05-27 6:22 ` crazylht at gmail dot com 2021-12-08 6:13 ` cvs-commit at gcc dot gnu.org 2021-12-08 6:15 ` crazylht at gmail dot com 2021-12-17 5:56 ` cvs-commit at gcc dot gnu.org
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