Heiher <admin@xxxxxxxxxxx> writes: > I want to use ICT Loongson 3A extension SIMD instructions in o32 ABI > program. The march loongson3a is based on mips64. -mfp32 don't work... I guess I don't know what it means to use -mips64 with -mabi=32. I'm not surprised that it doesn't work. I don't even think this is is a bug. You explained why you want to use -mips64, but why do you want to use -mabi=32? Why not just recompile the program? If you can't recompile the program, then as far as I can see you are going to have to write some sort of stubs to call between your o32 code and your mips64 code. Ian > On Wed, Nov 30, 2011 at 2:42 PM, Ian Lance Taylor <iant@xxxxxxxxxx> wrote: >> Heiher <admin@xxxxxxxxxxx> writes: >> >>> The o32 abi programs could only use even-numbered floating-point >>> registers by appointment. The GCC generate assembly source code using >>> odd-numbered floating-point register when I -march=mips64 and >>> -mabi=32. Every double floating-point instructions will use 32-bit >>> even/odd-numbered paired 64-bit fpr when 0 = bit FR in Status >>> register. However kernel set bit FR to a thread at loading ELF for N32 >>> or 64 only. In other words, o32 abi process can't use odd-numbered >>> fpr. >>> >>> How ought I to act? Thanks! >> >> I'm not sure it makes sense to use -march=mips64 -mabi=32. Why do you >> want to do that? >> >> You could try using the -mfp32 option but I don't know whether it will >> help. >> >> Ian
