https://bugs.llvm.org/show_bug.cgi?id=42852
Bug ID: 42852
Summary: ArgumentPromotion may not optimize 'byval' arguments
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Interprocedural Optimizations
Assignee: unassignedb...@nondot.org
Reporter: jdoerf...@anl.gov
CC: llvm-bugs@lists.llvm.org
Test like:
llvm/test/Transforms/ArgumentPromotion/byval-2.ll
llvm/test/Transforms/ArgumentPromotion/attrs.ll
show how we do not optimize byvals even if we could. While some of the checking
for argument promotion is impacted by byval, we could be way more aggressive as
the callee basically can have an own copy of the promoted value.
Desired behavior:
In both cases we want the 'byval %X' to be promoted and replaced by a local
allocation which is initialized with the preloaded value of %X.
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