On 08/01/2016 03:42 AM, Segher Boessenkool wrote:
+@deftypefn {Target Hook} void TARGET_SHRINK_WRAP_EMIT_PROLOGUE_COMPONENTS
(sbitmap)
+Emit prologue insns for the components indicated by the parameter.
+@end deftypefn
+
+@deftypefn {Target Hook} void TARGET_SHRINK_WRAP_EMIT_EPILOGUE_COMPONENTS
(sbitmap)
+Emit epilogue insns for the components indicated by the parameter.
+@end deftypefn
How do these actually know where to save/restore registers? The frame
pointer may have been eliminated, and SP isn't necessarily constant
during the function. Seems like you'd have to calculate CFA reg/offset
much like dwarf2out does and pass it to this hook.
Bernd
