Appendix A. ERC32 Compiler Options

Specify -mapp-regs to generate output using the global registers 2 through 4, which the SPARC SVR4 ABI reserves for applications. 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.

Generate output containing floating-point instructions. This is the default.

Generate output containing library calls for floating point.

-msoft-float changes the calling convention in the output file; therefore, it is only useful if you compile all of a program with this option.

With -mepilogue (the default), the compiler always emits code for function exit at the end of each function. Any function exit in the middle of the function (such as a return statement in C) will generate a jump to the exit code at the end of the function.

With -mno-epilogue, the compiler tries to emit exit code inline at every function exit.

Assume that doubles have 8 byte alignment. This is the default.

With -munaligned-doubles, the compiler assumes that doubles have 8 byte alignment only if they are contained in another type, or if they have an absolute address. Otherwise, it assumes they have 4 byte alignment. Specifying this option avoids some rare compatibility problems with code generated by other compilers. It is not the default because it results in a performance loss, especially for floating-point code.

Align loops to a 2 raised to a num byte boundary. If -malign-loops is not specified, the default is 2.

Align instructions that are only jumped to to a 2 raised to a num byte boundary. If -malign-jumps is not specified, the default is 2.

Align the start of functions to a 2 raised to num byte boundary. The default alignment is 4 bytes.

Select a SPARC V7 chipset (the default).

Select the Temic revision CBA chipset.

Select the Temic revision CCA chipset.

Select the Temic revision CDA chipset.

Generate code for cpu, where cpu is either v7, cba, cca or cda. The default is cba.