target/linux/generic/patches-4.9/308-mips32r2_tune.patch

   1 Add -mtune=34kc to MIPS CFLAGS when building for mips32r2
   2 This provides a good tradeoff across at least 24Kc-74Kc, while also
   3 producing smaller code.
   4
   5 Signed-off-by: Felix Fietkau <nbd@nbd.name>
   6
   7 --- a/arch/mips/Makefile
   8 +++ b/arch/mips/Makefile
   9 @@ -148,7 +148,7 @@ cflags-$(CONFIG_CPU_R4X00)  += -march=r46
  10  cflags-$(CONFIG_CPU_TX49XX)    += -march=r4600 -Wa,--trap
  11  cflags-$(CONFIG_CPU_MIPS32_R1) += $(call cc-option,-march=mips32,-mips32 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS32) \
  12                         -Wa,-mips32 -Wa,--trap
  13 -cflags-$(CONFIG_CPU_MIPS32_R2) += $(call cc-option,-march=mips32r2,-mips32r2 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS32) \
  14 +cflags-$(CONFIG_CPU_MIPS32_R2) += $(call cc-option,-march=mips32r2 -mtune=34kc,-mips32r2 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS32) \
  15                         -Wa,-mips32r2 -Wa,--trap
  16  cflags-$(CONFIG_CPU_MIPS32_R6) += -march=mips32r6 -Wa,--trap
  17  cflags-$(CONFIG_CPU_MIPS64_R1) += $(call cc-option,-march=mips64,-mips64 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS64) \