On 05/07/14 09:52, Matthew Fortune wrote:
The MIPS O32 FPXX ABI exposes a bug in regcprop where call part
clobbered information is not checked when calculating clobbered
registers. This is only one of many places that
regs_invalidated_by_call is used without also checking
HARD_REGNO_CALL_PART_CLOBBERED. This patch ensures that a part
clobbered register is treated as if fully clobbered.
Other places where this same issue occurs are not so easily
fixed as they do not always have mode information available
when calculating clobbered registers. A solution to the larger
problem will be significantly more involved.
Exposed in a testcase as part of:
http://gcc.gnu.org/ml/gcc-patches/2014-05/msg00401.html
Regards,
Matthew
2014-05-07 Matthew Fortune <matthew.fort...@imgtec.com>
gcc/
* regcprop.c (copyprop_hardreg_forward_1): Account for
HARD_REGNO_CALL_PART_CLOBBERED.
OK.
Jeff
