https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70078
Bug ID: 70078
Summary: gccint: define_split "not" allowed to create pseudos
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: other
Assignee: unassigned at gcc dot gnu.org
Reporter: vogt at linux dot vnet.ibm.com
Target Milestone: ---
The section "Defining How to Split Instructions" in the gccint manual claims
The preparation-statements are similar to those statements that are
specified for define_expand.
...
Unlike those in define_expand, however, these statements must not
generate any new pseudo-registers. Once reload has completed, they
also must not allocate any space in the stack frame.
Splitters seem to be allowed to generate new pseudos under certain
circumstances (some splitters call can_create_psudo_p()). So, is this correct
instead?
...
Unlike those in define_expand, however, once reload has completed
these statements must neither generate any new pseudo-registers nor
allocate any space in the stack frame. This can be checked by calling
can_create_pseudo_p.
