This is what has been done for ages on SPARC/Solaris and makes it possible
to use 64-bit atomic instructions even in 32-bit mode.
gcc/
PR target/104189
* config/sparc/linux64.h (TARGET_DEFAULT): Add MASK_V8PLUS.
#if defined(TARGET_64BIT_DEFAULT) && TARGET_CPU_DEFAULT >= TARGET_CPU_v9
#undef TARGET_DEFAULT
#define TARGET_DEFAULT \
- (MASK_V9 + MASK_PTR64 + MASK_64BIT + MASK_STACK_BIAS + \
- MASK_APP_REGS + MASK_FPU + MASK_LONG_DOUBLE_128)
+ (MASK_V9 + MASK_64BIT + MASK_PTR64 + MASK_STACK_BIAS + \
+ MASK_V8PLUS + MASK_APP_REGS + MASK_FPU + MASK_LONG_DOUBLE_128)
#endif
/* This must be v9a not just v9 because by default we enable