This series of patches makes the rs6000 backend properly honour
-ffixed-reg in that compiler generated code should never write them,
even when restoring saved copies of registers.
Patch 1 and 2 are the bugfix. Patch 3 and 4 allow saving regs using
stmw or out-of-line save functions, even when the range includes some
global/-ffixed regs.
Bootstrapped and regression tested powerpc64le-linux. OK for gcc-7?
Alan Modra (4):
[RS6000] Simplify setting of
fixed_regs[RS6000_PIC_OFFSET_TABLE_REGNUM]
[RS6000] PR69645, -ffixed-reg ignored
[RS6000] Split SAVRES_STRATEGY
[RS6000] Allow saving of fixed regs.
gcc/config/rs6000/rs6000.c | 210 +++++++++++++++++++++++++--------------------
1 file changed, 115 insertions(+), 95 deletions(-)
--
Alan Modra
Australia Development Lab, IBM
