As per architecture, SuperH has a reversed NaN signalling bit
vs IEEE754-2008, it also has a NaN propgation rule similar to
MIPS style.
Use mips style float format and mode for all float types, and
correct sfp-machine header accordingly.
PR target/111814
gcc/ChangeLog:
* config/sh/sh-modes.def (RESET_FLOAT_FORMAT): Use mips format.
(FLOAT_MODE): Use mips mode.
libgcc/ChangeLog:
* config/sh/sfp-machine.h (_FP_NANFRAC_B): Reverse signaling bit.
(_FP_NANFRAC_H): Likewise.
(_FP_NANFRAC_S): Likewise.
(_FP_NANFRAC_D): Likewise.
(_FP_NANFRAC_Q): Likewise.
(_FP_KEEPNANFRACP): Enable for target.
(_FP_QNANNEGATEDP): Enable for target.
(_FP_CHOOSENAN): Port from MIPS.
gcc/testsuite/ChangeLog:
* gcc.target/sh/pr111814.c: New test.
