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>

diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index 91cf405..f7cfa7d 100644 (file)
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -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

diff --git a/arch/arc/Makefile b/arch/arc/Makefile
index 46d8731..8a27a48 100644 (file)
--- a/arch/arc/Makefile
+++ b/arch/arc/Makefile
@@ -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