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kernel: add -mtune=34kc to MIPS CFLAGS when building for mips32r2

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This provides a good tradeoff across at least 24Kc-74Kc, while also
producing smaller code.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2016-08-04 22:42:28 +02:00
parent ecf7671b76
commit 002b453687
1 changed files with 17 additions and 0 deletions
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target/linux/generic/patches-4.4/308-mips32r2_tune.patch Normal file
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Add -mtune=34kc to MIPS CFLAGS when building for mips32r2
This provides a good tradeoff across at least 24Kc-74Kc, while also
producing smaller code.
Signed-off-by: Felix Fietkau <nbd@nbd.name>
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -145,7 +145,7 @@ cflags-$(CONFIG_CPU_R4X00) += -march=r46
cflags-$(CONFIG_CPU_TX49XX) += -march=r4600 -Wa,--trap
cflags-$(CONFIG_CPU_MIPS32_R1) += $(call cc-option,-march=mips32,-mips32 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS32) \
-Wa,-mips32 -Wa,--trap
-cflags-$(CONFIG_CPU_MIPS32_R2) += $(call cc-option,-march=mips32r2,-mips32r2 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS32) \
+cflags-$(CONFIG_CPU_MIPS32_R2) += $(call cc-option,-march=mips32r2 -mtune=34kc,-mips32r2 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS32) \
-Wa,-mips32r2 -Wa,--trap
cflags-$(CONFIG_CPU_MIPS32_R6) += -march=mips32r6 -Wa,--trap
cflags-$(CONFIG_CPU_MIPS64_R1) += $(call cc-option,-march=mips64,-mips64 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS64) \