[LLVMbugs] [Bug 19426] New: AArch64/ARM64: Investigate AArch64/ARM64 ideas of fastcc

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Mon Apr 14 06:49:07 PDT 2014


            Bug ID: 19426
           Summary: AArch64/ARM64: Investigate AArch64/ARM64 ideas of
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: AArch64
          Assignee: unassignedbugs at nondot.org
          Reporter: t.p.northover at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

AArch64 seems to implement a much more aggressive fastcc than ARM64 which
allows tail call optimisations to be applied in more circumstances.

We need to sort out what the best behaviour here is (including whether anyone
is actually using fastcc and relying on some particular behaviour).

Seems like it could be a fairly long task, so I'm filing this as a separate

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