3.18.45. SPARC Options
3.18.45 SPARC Options
These ‘-m’ options are supported on the SPARC:
-mno-app-regs-mapp-regs-
Specify -mapp-regs to generate output using the global registers 2 through 4, which the SPARC SVR4 ABI reserves for applications. Like the global register 1, each global register 2 through 4 is then treated as an allocable register that is clobbered by function calls. This is the default.
To be fully SVR4 ABI-compliant at the cost of some performance loss, specify -mno-app-regs. You should compile libraries and system software with this option.
-mflat-mno-flat-
With -mflat, the compiler does not generate save/restore instructions and uses a “flat” or single register window mode