[{"id":3683438,"web_url":"http://patchwork.ozlabs.org/comment/3683438/","msgid":"<08bd40ba-7a7d-4f76-afff-e14581ccafa7@oss.qualcomm.com>","list_archive_url":null,"date":"2026-04-28T12:52:11","subject":"Re: [PATCH v1 1/2] RISC-V: Combine vec_duplicate + vmsgtu.vv to\n vmsgtu.vx on GR2VR cost","submitter":{"id":92310,"url":"http://patchwork.ozlabs.org/api/people/92310/","name":"Jeffrey Law","email":"jeffrey.law@oss.qualcomm.com"},"content":"On 4/28/2026 1:26 AM, pan2.li@intel.com wrote:\n> From: Pan Li \n>\n> This patch would like to combine the vec_duplicate + vmsgtu.vv to the\n> vmsgtu.vx. From example as below code. The related pattern will depend\n> on the cost of vec_duplicate from GR2VR. Then the late-combine will\n> take action if the cost of GR2VR is zero, and reject the combination\n> if the GR2VR cost is greater than zero.\n>\n> Assume we have asm code like below, GR2VR cost is 0.\n>\n> Before this patch:\n> 11 beq a3,zero,.L8\n> 12 vsetvli a5,zero,e32,m1,ta,ma\n> 13 vmv.v.x v2,a2\n> ...\n> 16 .L3:\n> 17 vsetvli a5,a3,e32,m1,ta,ma\n> ...\n> 22 vmsgtu.vv v1,v2,v3\n> ...\n> 25 bne a3,zero,.L3\n>\n> After this patch:\n> 11 beq a3,zero,.L8\n> ...\n> 14 .L3:\n> 15 vsetvli a5,a3,e32,m1,ta,ma\n> ...\n> 20 vmsgtu.vx v1,a2,v3\n> ...\n> 23 bne a3,zero,.L3\n>\n> gcc/ChangeLog:\n>\n> \t* config/riscv/predicates.md: Add ltu to swappable\n> \tcmp operator.\n> \t* config/riscv/riscv-v.cc (get_swapped_cmp_rtx_code): Handle\n> \tthe swapped rtx code as well.\nBoth patches in this set are OK.\njeff","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","gcc-patches@gcc.gnu.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","gcc-patches@gcc.gnu.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=qualcomm.com header.i=@qualcomm.com header.a=rsa-sha256\n header.s=qcppdkim1 header.b=XceM9oRc;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com\n header.a=rsa-sha256 header.s=google header.b=DPebAjrr;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=2620:52:6:3111::32; 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