diff options
Diffstat (limited to 'arch/nds32/include/asm/fpu.h')
| -rw-r--r-- | arch/nds32/include/asm/fpu.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/nds32/include/asm/fpu.h b/arch/nds32/include/asm/fpu.h index 9b1107b58e23..019f1bcfc5ee 100644 --- a/arch/nds32/include/asm/fpu.h +++ b/arch/nds32/include/asm/fpu.h @@ -28,7 +28,18 @@ extern int do_fpuemu(struct pt_regs *regs, struct fpu_struct *fpu); #define sNAN64 0xFFFFFFFFFFFFFFFFULL #define sNAN32 0xFFFFFFFFUL +#if IS_ENABLED(CONFIG_SUPPORT_DENORMAL_ARITHMETIC) +/* + * Denormalized number is unsupported by nds32 FPU. Hence the operation + * is treated as underflow cases when the final result is a denormalized + * number. To enhance precision, underflow exception trap should be + * enabled by default and kerenl will re-execute it by fpu emulator + * when getting underflow exception. + */ +#define FPCSR_INIT FPCSR_mskUDFE +#else #define FPCSR_INIT 0x0UL +#endif extern const struct fpu_struct init_fpuregs; |