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Don't use -Wl,--fix-cortex-a8 for Cortex A7, A9, A15, Krait or Denver 

-Wl,--fix-cortex-a8 is a workaround for an Erratum in Cortex-A8
processors. It slightly increases code size and decreases performance,
and there's no point in using it on non-A8 CPUs.

Instead of forcing it unconditionally, use it when targeting
Cortex-A8 or generic armv7-a (which might or might not be A8).

Change-Id: Ifa59765d380445237edccfe5440a67b3ba1e459a
Signed-off-by: Bernhard Rosenkränzer <Bernhard.Rosenkranzer@linaro.org>
This commit is contained in:
Bernhard Rosenkränzer 2015-03-25 17:15:29 +01:00
parent 5d60719e42
commit 4da707176b
1 changed files with 9 additions and 3 deletions
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12
core/combo/arch/arm/armv7-a-neon.mk
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@ -16,14 +16,23 @@ ifneq (,$(filter cortex-a15 krait denver,$(TARGET_$(combo_2nd_arch_prefix)CPU_VA
# Fake an ARM compiler flag as these processors support LPAE which GCC/clang # Fake an ARM compiler flag as these processors support LPAE which GCC/clang
# don't advertise. # don't advertise.
arch_variant_cflags += -D__ARM_FEATURE_LPAE=1 arch_variant_cflags += -D__ARM_FEATURE_LPAE=1
arch_variant_ldflags := \
-Wl,--no-fix-cortex-a8
else else
ifeq ($(strip $(TARGET_$(combo_2nd_arch_prefix)CPU_VARIANT)),cortex-a8) ifeq ($(strip $(TARGET_$(combo_2nd_arch_prefix)CPU_VARIANT)),cortex-a8)
arch_variant_cflags := -mcpu=cortex-a8 arch_variant_cflags := -mcpu=cortex-a8
arch_variant_ldflags := \
-Wl,--fix-cortex-a8
else else
ifeq ($(strip $(TARGET_$(combo_2nd_arch_prefix)CPU_VARIANT)),cortex-a7) ifeq ($(strip $(TARGET_$(combo_2nd_arch_prefix)CPU_VARIANT)),cortex-a7)
arch_variant_cflags := -mcpu=cortex-a7 arch_variant_cflags := -mcpu=cortex-a7
arch_variant_ldflags := \
-Wl,--no-fix-cortex-a8
else else
arch_variant_cflags := -march=armv7-a arch_variant_cflags := -march=armv7-a
# Generic ARM might be a Cortex A8 -- better safe than sorry
arch_variant_ldflags := \
-Wl,--fix-cortex-a8
endif endif
endif endif
endif endif
@ -31,6 +40,3 @@ endif
arch_variant_cflags += \ arch_variant_cflags += \
-mfloat-abi=softfp \ -mfloat-abi=softfp \
-mfpu=neon -mfpu=neon
arch_variant_ldflags := \
-Wl,--fix-cortex-a8