2013-11-11 Ulrich Weigand
* config/rs6000/rs6000.c (rs6000_emit_prologue): Do not place a
RTX_FRAME_RELATED_P marker on the UNSPEC_MOVESI_FROM_CR insn.
Instead, add USEs of all modified call-saved CR fields to the
insn storing the result to the stack slot, and provide an
appropriate REG_FRAME_R
Hello,
this patch fixes a corner case bug in unwinding CR values. The
underlying problem is as follows:
In order to save the CR in the prologue, two insns are necessary.
The first is a mfcr that loads the CR value into a GPR, and the
second is a store of the GPR to the stack. The back-end curre
