[llvm-bugs] [Bug 44358] New: [AArch64] Clang generates stores to -ffixed-xNN registers

via llvm-bugs llvm-bugs at lists.llvm.org
Fri Dec 20 19:55:36 PST 2019


            Bug ID: 44358
           Summary: [AArch64] Clang generates stores to -ffixed-xNN
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: phosek at chromium.org
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

Created attachment 22958
  --> https://bugs.llvm.org/attachment.cgi?id=22958&action=edit

Bisecting shows that this was introduced by D70450. I've attached a reproducer,
if you disassemble the output you'd see that Clang generates several
instructions that touch x15 despite using -ffixed-x15.

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