Thank you reply! 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... :( 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 -- Best regards! Heiher
