https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93525
Bug ID: 93525
Summary: Left shift and arithmetic shift could be futher
simplified in simplify-rtx.c
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: tnfchris at gcc dot gnu.org
Target Milestone: ---
simplify-rtx currently will fold and combine Arithmetic and Logical right
shifts with a constant shift count and fold consecutive shifts into a single
one.
If for the logical case if the if the shift count goes out of range it
truncates it to 0 but doesn't handle the case for the arithmetic shift.
Also neither operation is performed for left shifts.
