On Fri, 3 May 2013, Michael Meissner wrote: > 2013-05-03 Michael Meissner <meiss...@linux.vnet.ibm.com> > > PR target/57150 > * config/rs6000/rs6000.h (HARD_REGNO_CALLER_SAVE_MODE): Use DFmode > to save TFmode registers and DImode to save TImode registers for > caller save operations. > (HARD_REGNO_CALL_PART_CLOBBERED): TFmode and TDmode do not need to > mark being partially clobbered since they only use the first > double word. > > * config/rs6000/rs6000.c (rs6000_init_hard_regno_mode_ok): TFmode > and TDmode only use the upper 64-bits of each VSX register.
That change has the effect that reload thinks TFmode (and no doubt TDmode) only takes two registers even when in general registers, causing a segfault in glibc's test-ldouble built for soft float. I'm testing this patch (this diff is against 4.8 branch) to fix this; at least, it fixes the glibc testing issue. Since the original patch went on 4.7 and 4.8 branches as well as trunk, I propose this patch for the branches as well as trunk. You may wish to test it in your original VSX configuration. 2013-07-03 Joseph Myers <jos...@codesourcery.com> * config/rs6000/rs6000.c (rs6000_init_hard_regno_mode_ok): Only adjust register size for TDmode and TFmode for VSX registers. Index: config/rs6000/rs6000.c =================================================================== --- config/rs6000/rs6000.c (revision 200641) +++ config/rs6000/rs6000.c (working copy) @@ -2190,7 +2190,8 @@ rs6000_init_hard_regno_mode_ok (bool global_init_p int reg_size2 = reg_size; /* TFmode/TDmode always takes 2 registers, even in VSX. */ - if (m == TDmode || m == TFmode) + if (TARGET_VSX && VSX_REG_CLASS_P (c) + && (m == TDmode || m == TFmode)) reg_size2 = UNITS_PER_FP_WORD; rs6000_class_max_nregs[m][c] -- Joseph S. Myers jos...@codesourcery.com