From: Matheus Ferst <matheus.fe...@eldorado.org.br> This RFC is a first attempt at implementing the 128-bit integer conversion routines in softfloat, as required by the xscv[su]qqp and xscvqp[su]qz instructions of PowerISA v3.1.
Instead of using int128.h, int-to-float routines receive the 128-bit numbers through a pair of 64-bit values, and float-to-int conversions use a pointer to return the lower half of the result. We only need the parts128 methods, but since the difference to parts64 ones seemed minor, I included both in this patch. RFC: - Should we use struct Int128 instead of 64-bit value pairs? - I've not tested the float64 methods since the PPC instructions only use the quad-precision routines. Should we keep them in the final version? Matheus Ferst (6): softfloat: add uint128_to_float* conversion methods softfloat: add int128_to_float* conversion methods softfloat: add float*_to_uint128 conversion methods softfloat: add float*_to_int128 conversion methods target/ppc: implement xscv[su]qqp target/ppc: implement xscvqp[su]qz fpu/softfloat-parts.c.inc | 202 ++++++++++++++++++++++++++++ fpu/softfloat.c | 161 ++++++++++++++++++++++ include/fpu/softfloat.h | 23 ++++ target/ppc/fpu_helper.c | 34 +++++ target/ppc/helper.h | 4 + target/ppc/insn32.decode | 7 + target/ppc/translate/vsx-impl.c.inc | 22 +++ 7 files changed, 453 insertions(+) -- 2.25.1
