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The behavior of the -mdisable-fpregs is confusing in that it doesn't disable the use of the floating-point registers in all situations. The -msoft-float disables the use of the floating-point registers in all situations. The Linux kernel only needs to disable use of the xmpyu instruction to avoid using the floating-point registers. This change revises the -mdisable-fpregs option to disable the use of the floating-point registers in all situations. It is now equivalent to the -msoft-float option. A new -msoft-mult option is added to disable use of the xmpyu instruction. The libgcc library can be compiled with the -msoft-mult option to avoid using hardware integer multiplication. 2021-10-24 John David Anglin <danglin@gcc.gnu.org> gcc/ChangeLog: * config/pa/pa-d.c (pa_d_handle_target_float_abi): Don't check TARGET_DISABLE_FPREGS. * config/pa/pa.c (fix_range): Use MASK_SOFT_FLOAT instead of MASK_DISABLE_FPREGS. (hppa_rtx_costs): Don't check TARGET_DISABLE_FPREGS. Adjust cost of hardware integer multiplication. (pa_conditional_register_usage): Don't check TARGET_DISABLE_FPREGS. * config/pa/pa.h (INT14_OK_STRICT): Likewise. * config/pa/pa.md: Don't check TARGET_DISABLE_FPREGS. Check TARGET_SOFT_FLOAT in patterns that use xmpyu instruction. * config/pa/pa.opt (mdisable-fpregs): Change target mask to SOFT_FLOAT. Revise comment. (msoft-float): New option. |
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