On Wed, Jan 20, 2016 at 8:00 PM, Michael Meissner <meiss...@linux.vnet.ibm.com> wrote: > This is revision 4 of the IEEE 128-bit floating point libgcc support. > > Since revision 3, I have removed the gcc changes that broke AIX. I rewrote > the > IBM extended double pack/unpack support to not use the builtin functions, but > instead uses a union. The libgcc code that I wrote tickles a bug in the pack > function. While I would like to fix the pack function bug, I will need to > make > sure I don't break AIX, so I didn't want to couple this library to getting > those bugs fixed. > > I have also rewritten how the ifunc support is done, so that ifunc is only > done > if the target assembler supports ISA 3.0 instructions AND the compiler > supports > ifunc functions. This is so that the compiler can build on 64-bit systems if > --enable-gnu-indirect-function is not specified without the ifunc functions > being flagged. > > I have done bootstraps on both a big endian power7 system and a little endian > power8 with no regressions. In addition, I have built a compiler explicitly > disabling ifunc support, and it built and ran the ieee 128-bit floating point > unit tests correctly. > > Can I install this into libgcc? > > Assuming I can install these changes, the one final change that I would like > to > make is to enable float128 automatically on VSX powerpc Linux systems, but not > on other systems (AIX, *BSD, etc.) since those systems do not build float128 > emulator functions.
What does "enable" mean? > 2016-01-20 Michael Meissner <meiss...@linux.vnet.ibm.com> > Steven Munroe <munro...@linux.vnet.ibm.com> > Tulio Magno Quites Machado Filho <tuli...@br.ibm.com> > > * config/rs6000/float128-sed: New files to convert TF names to KF > names for PowerPC IEEE 128-bit floating point support. > * config/rs6000/float128-sed-hw: Likewise. > > * config/rs6000/float128-hw.c: New file for ISA 3.0 IEEE 128-bit > floating point hardware support. > > * config/rs6000/float128-ifunc.c: New file to pick either IEEE > 128-bit floating point software emulation or use ISA 3.0 hardware > support if it is available. > > * config/rs6000/quad-float128.h: New file to support IEEE 128-bit > floating point. > > * config/rs6000/extendkftf2-sw.c: New file, convert IEEE 128-bit > floating point to IBM extended double. > > * config/rs6000/trunctfkf2-sw.c: New file, convert IBM extended > double to IEEE 128-bit floating point. > > * config/rs6000/t-float128: New Makefile fragments to enable > building __float128 emulation support. > * config/rs6000/t-float128-hw: Likewise. > > * config/rs6000/sfp-exceptions.c: New file to provide exception > support for IEEE 128-bit floating point. > > * config/rs6000/floattikf.c: New files for converting between IEEE > 128-bit floating point and signed/unsigned 128-bit integers. > * config/rs6000/fixunskfti.c: Likewise. > * config/rs6000/fixkfti.c: Likewise. > * config/rs6000/floatuntikf.c: Likewise. > > * config/rs6000/sfp-machine.h (_FP_W_TYPE_SIZE): Use 64-bit types > when building on 64-bit systems, or when VSX is enabled. > (_FP_W_TYPE): Likewise. > (_FP_WS_TYPE): Likewise. > (_FP_I_TYPE): Likewise. > (TItype): Define on 64-bit systems. > (UTItype): Likewise. > (TI_BITS): Likewise. > (_FP_MUL_MEAT_D): Add support for using 64-bit types. > (_FP_MUL_MEAT_Q): Likewise. > (_FP_DIV_MEAT_D): Likewise. > (_FP_DIV_MEAT_Q): Likewise. > (_FP_NANFRAC_D): Likewise. > (_FP_NANFRAC_Q): Likewise. > (ISA_BIT): Add exception support if we are being compiled on a > machine with hardware floating point support to build the IEEE > 128-bit emulation functions. > (FP_EX_INVALID): Likewise. > (FP_EX_OVERFLOW): Likewise. > (FP_EX_UNDERFLOW): Likewise. > (FP_EX_DIVZERO): Likewise. > (FP_EX_INEXACT): Likewise. > (FP_EX_ALL): Likewise. > (__sfp_handle_exceptions): Likewise. > (FP_HANDLE_EXCEPTIONS): Likewise. > (FP_RND_NEAREST): Likewise. > (FP_RND_ZERO): Likewise. > (FP_RND_PINF): Likewise. > (FP_RND_MINF): Likewise. > (FP_RND_MASK): Likewise. > (_FP_DECL_EX): Likewise. > (FP_INIT_ROUNDMODE): Likewise. > (FP_ROUNDMODE): Likewise. > > * libgcc/config.host (powerpc*-*-linux*): If compiler can compile > VSX code, enable IEEE 128-bit floating point. If the compiler can > compile IEEE 128-bit floating point code with ISA 3.0 IEEE 128-bit > floating point hardware instructions and it supports declaring > functions with the ifunc attribute, enable ifunc functions to > switch between software and hardware support. > * configure.ac (powerpc*-*-linux*): Likewise. > * configure: Regenerate. Okay. Thanks, David
