[llvm-bugs] [Bug 48980] New: [ARM] Very non-optimal register allocation for basic operations

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48980

            Bug ID: 48980
           Summary: [ARM] Very non-optimal register allocation for basic
                    operations
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: ARM
          Assignee: unassignedbugs at nondot.org
          Reporter: gabravier at gmail.com
                CC: llvm-bugs at lists.llvm.org, smithp352 at googlemail.com,
                    Ties.Stuij at arm.com

int square(int num)
{
    return num * num;
}

With -O3, GCC generates this:

square(int):
  mul r0, r0, r0
  bx lr

LLVM generates this:

square(int):
  mul r1, r0, r0
  mov r0, r1
  bx lr

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