[LLVMbugs] [Bug 24110] New: [AArch64] Unnecessary Spill/Reload callee-saved registers

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=24110

            Bug ID: 24110
           Summary: [AArch64] Unnecessary Spill/Reload callee-saved
                    registers
           Product: tools
           Version: trunk
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: llc
          Assignee: unassignedbugs at nondot.org
          Reporter: lawrence at codeaurora.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 14585
  --> https://llvm.org/bugs/attachment.cgi?id=14585&action=edit
testcase in IR

Assembly:

        str     w22, [sp, #40]          // 4-byte Folded Spill  <=== not
necessary
        str     x5, [sp, #120]          // 8-byte Folded Spill
        str     w19, [sp, #48]          // 4-byte Folded Spill
        mov      x19, x6
        bl      fprintf
        mov      w30, w24
        mov      x6, x19
        ldr     w19, [sp, #48]          // 4-byte Folded Reload
        ldp     x7, x5, [sp, #112]
        ldr     w22, [sp, #40]          // 4-byte Folded Reload  <=== not
necessary


testcase is attached, it can be reproduced (via llc or llc -O3) with today's
llvm, here are the list of last commit:
llvm: 557268562107cfb8fdb19ac1c87fc6a8182180b5
clang: c6b4ddb4d7b507e0eb0a127fb6aa9556abc01409

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