Commit 81a48ee4 authored Aug 06, 2019 by Palmer Dabbelt Committed by Paul Walmsley Aug 08, 2019

RISC-V: Remove udivdi3



This should never have landed in the first place: it was added as part
of 64-bit divide support for 32-bit systems, but the kernel doesn't
allow this sort of division.  I must have forgotten to remove it.

This patch removes the support.  Since this routine only worked on
64-bit platforms but was only built on 32-bit platforms, it's
essentially just nonsense anyway.

Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
Acked-by: Nicolas Pitre <nico@fluxnic.net>
Link: https://lore.kernel.org/linux-riscv/nycvar.YSQ.7.76.1908061413360.19480@knanqh.ubzr/T/#t


Reported-by: Eric Lin <tesheng@andestech.com>
Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>

parent 66cc016a

arch/riscv/lib/Makefile

+0 −2

Original line number	Diff line number	Diff line
		@@ -5,5 +5,3 @@ lib-y += memset.o
		lib-y += uaccess.o

		lib-$(CONFIG_64BIT) += tishift.o

		lib-$(CONFIG_32BIT) += udivdi3.o

arch/riscv/lib/udivdi3.S

deleted100644 → 0

+0 −32

Original line number	Diff line number	Diff line
		/* SPDX-License-Identifier: GPL-2.0-only */
		/*
		* Copyright (C) 2016-2017 Free Software Foundation, Inc.
		*/

		#include <linux/linkage.h>

		ENTRY(__udivdi3)
		mv a2, a1
		mv a1, a0
		li a0, -1
		beqz a2, .L5
		li a3, 1
		bgeu a2, a1, .L2
		.L1:
		blez a2, .L2
		slli a2, a2, 1
		slli a3, a3, 1
		bgtu a1, a2, .L1
		.L2:
		li a0, 0
		.L3:
		bltu a1, a2, .L4
		sub a1, a1, a2
		or a0, a0, a3
		.L4:
		srli a3, a3, 1
		srli a2, a2, 1
		bnez a3, .L3
		.L5:
		ret
		ENDPROC(__udivdi3)