https://bugs.llvm.org/show_bug.cgi?id=46118
Bug ID: 46118
Summary: Large numbers of (e.g., 27) redundant vxorpd generated
on loop entry
Product: new-bugs
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: elr...@gmail.com
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org
The generated code does the following:
vxorp 27 registers
checks if the loop iterates at least once. If it doesn't, jump.
vxorp those exact same 27 registers
enters loop.
The second set of 27 vxorpd is unnecessary, those registers are all already 0.
Godbolt:
https://godbolt.org/z/nsc7kc
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