The PPC64LE ABI specifies POWER8 ISA as the minimum hardware requierment. Currently, Linux distributions are building the toolchain using --with-cpu=power7 or power8, as they wish. GCC defaults to essentially the POWER4 ISA.
The appended patch changes the default for PPC64LE to POWER8 (ISA 2.7). 32-bit PPC SVR4 is not really defined, but it is left unchanged with no minimum ISA. The default ISA can be overridden using --with-cpu= and we presume that Linux distributions and users will continue to configure as they require for their deployment. * config/rs6000/default64.h (TARGET_DEFAULT) [LITTLE_ENDIAN]: Use ISA 2.7 (POWER8). Thanks, David Index: default64.h =================================================================== --- default64.h (revision 219607) +++ default64.h (working copy) @@ -20,7 +20,7 @@ #if (TARGET_DEFAULT & MASK_LITTLE_ENDIAN) #undef TARGET_DEFAULT -#define TARGET_DEFAULT (MASK_PPC_GFXOPT | MASK_POWERPC64 | MASK_64BIT | MASK_LITTLE_ENDIAN) +#define TARGET_DEFAULT (ISA_2_7_MASKS_SERVER | MASK_POWERPC64 | MASK_64BIT | MASK_LITTLE_ENDIAN) #else #undef TARGET_DEFAULT #define TARGET_DEFAULT (MASK_PPC_GFXOPT | MASK_POWERPC64 | MASK_64BIT)
