#   BSD LICENSE
# 
#   Copyright(c) 2010-2012 Intel Corporation. All rights reserved.
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# 

#
# CPUID-related options
#
# This was added to support compiler versions which might not support all the
# flags we need
#

#find out GCC version

GCC_MAJOR_VERSION = $(shell $(CC) -dumpversion | cut -f1 -d.)

# if GCC is not 4.x
ifneq ($(GCC_MAJOR_VERSION),4)
	MACHINE_CFLAGS =
$(warning You are not using GCC 4.x. This is neither supported, nor tested.)


else
	GCC_MINOR_VERSION = $(shell $(CC) -dumpversion | cut -f2 -d.)

# GCC graceful degradation
# GCC 4.2.x - added support for generic target
# GCC 4.3.x - added support for core2, ssse3, sse4.1, sse4.2
# GCC 4.4.x - added support for avx, aes, pclmul
# GCC 4.5.x - added support for atom
# GCC 4.6.x - added support for corei7, corei7-avx
# GCC 4.7.x - added support for fsgsbase, rdrnd, f16c, core-avx-i, core-avx2

	ifeq ($(shell test $(GCC_MINOR_VERSION) -lt 7 && echo 1), 1)
		MACHINE_CFLAGS := $(patsubst -march=core-avx-i,-march=corei7-avx,$(MACHINE_CFLAGS))
		MACHINE_CFLAGS := $(patsubst -march=core-avx2,-march=corei7-avx,$(MACHINE_CFLAGS))
	endif
	ifeq ($(shell test $(GCC_MINOR_VERSION) -lt 6 && echo 1), 1)
		MACHINE_CFLAGS := $(patsubst -march=corei7-avx,-march=core2 -maes -mpclmul -mavx,$(MACHINE_CFLAGS))
		MACHINE_CFLAGS := $(patsubst -march=corei7,-march=core2 -maes -mpclmul,$(MACHINE_CFLAGS))
	endif
	ifeq ($(shell test $(GCC_MINOR_VERSION) -lt 5 && echo 1), 1)
		MACHINE_CFLAGS := $(patsubst -march=atom,-march=core2 -mssse3,$(MACHINE_CFLAGS))
	endif
	ifeq ($(shell test $(GCC_MINOR_VERSION) -lt 4 && echo 1), 1)
		MACHINE_CFLAGS := $(filter-out -mavx -mpclmul -maes,$(MACHINE_CFLAGS))
		ifneq ($(findstring SSE4_2, $(CPUFLAGS)),)
			MACHINE_CFLAGS += -msse4.2
		endif
		ifneq ($(findstring SSE4_1, $(CPUFLAGS)),)
			MACHINE_CFLAGS += -msse4.1
		endif
	endif
	ifeq ($(shell test $(GCC_MINOR_VERSION) -lt 3 && echo 1), 1)
		MACHINE_CFLAGS := $(filter-out -msse% -mssse%,$(MACHINE_CFLAGS))
		MACHINE_CFLAGS := $(patsubst -march=core2,-march=generic,$(MACHINE_CFLAGS))
		MACHINE_CFLAGS += -msse3
	endif
	ifeq ($(shell test $(GCC_MINOR_VERSION) -lt 2 && echo 1), 1)
		MACHINE_CFLAGS := $(filter-out -march% -mtune% -msse%,$(MACHINE_CFLAGS))
	endif
endif
MACHINE_CFLAGS += $(addprefix -DRTE_MACHINE_CPUFLAG_,$(CPUFLAGS))

# To strip whitespace
comma:= ,
empty:=
space:= $(empty) $(empty)
CPUFLAGSTMP1 := $(addprefix RTE_CPUFLAG_,$(CPUFLAGS))
CPUFLAGSTMP2 := $(subst $(space),$(comma),$(CPUFLAGSTMP1))
MACHINE_CFLAGS += -DRTE_COMPILE_TIME_CPUFLAGS=$(CPUFLAGSTMP2)