https://bugs.llvm.org/show_bug.cgi?id=33184
Bug ID: 33184
Summary: NewGVN should account for switch statements with
multiple edges to themselves
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: dav...@freebsd.org
CC: dber...@dberlin.org, llvm-bugs@lists.llvm.org
If switch statements with multiple edges to itself are allowed, then the
current ordering might not work.
Quoting from https://reviews.llvm.org/D24805
"""
Do we allow switch statements with multiple edges to ourself?
ie
bb1:
switch <whatever> [
i32 0 : label bb1
i32 1: label bb1 ]
(which, after propagation, could cause a phi with different operands and the
same incoming blocks)
If so, either we need stable sorts, or a better ordering of incoming blocks,
because the pointer equality we use will not definitely sort them into a
consistent order
"""
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