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Commit d05a76ab authored Jul 16, 2015 by Alexey Brodkin Committed by Vineet Gupta Jul 20, 2015

ARCv2: add knob for DIV_REV in Kconfig



Being highly configurable core ARC HS among other features might be
configured with or without DIV_REM_OPTION (hardware divider).

That option when enabled adds following instructions: div, divu, rem, remu.

By default ARC HS38 has this option enabled. So we add here possibility
to disable usage of hardware divider by compiler.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

parent aeec6cda

arch/arc/Kconfig

+4 −0

Original line number	Diff line number	Diff line
		@@ -379,6 +379,10 @@ config ARC_HAS_LL64
		dest operands with 2 possible source operands.
		default y

		config ARC_HAS_DIV_REM
		bool "Insn: div, divu, rem, remu"
		default y

		config ARC_HAS_RTC
		bool "Local 64-bit r/o cycle counter"
		default n

arch/arc/Makefile

+9 −1

Original line number	Diff line number	Diff line
		@@ -36,8 +36,16 @@ cflags-$(atleast_gcc44) += -fsection-anchors
		cflags-$(CONFIG_ARC_HAS_LLSC) += -mlock
		cflags-$(CONFIG_ARC_HAS_SWAPE) += -mswape

		ifdef CONFIG_ISA_ARCV2

		ifndef CONFIG_ARC_HAS_LL64
		cflags-$(CONFIG_ISA_ARCV2) += -mno-ll64
		cflags-y += -mno-ll64
		endif

		ifndef CONFIG_ARC_HAS_DIV_REM
		cflags-y += -mno-div-rem
		endif

		endif

		cflags-$(CONFIG_ARC_DW2_UNWIND) += -fasynchronous-unwind-tables