cmd/internal/obj/ppc64: use MOVDU to update stack reg for leaf functions where possible

When the stack register is decremented to acquire stack space at
the beginning of a function, a MOVDU should be used so it is done
atomically, unless the size of the stack frame is too large for
that instruction.  The code to determine whether to use MOVDU
or MOVD was checking if the function was a leaf and always generating MOVD
when it was.  The choice of MOVD vs. MOVDU should only depend on the stack
frame size.  This fixes that problem.

Change-Id: I0e49c79036f1e8f7584179e1442b938fc6da085f
Reviewed-on: https://go-review.googlesource.com/41813
Reviewed-by: Michael Munday <munday@ca.ibm.com>

0 files changed, 0 insertions, 0 deletions