[llvm-bugs] [Bug 47608] New: Extract value from vector - dynamic index

via llvm-bugs llvm-bugs at lists.llvm.org
Tue Sep 22 04:24:21 PDT 2020


            Bug ID: 47608
           Summary: Extract value from vector - dynamic index
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: david.bolvansky at gmail.com
                CC: craig.topper at gmail.com, llvm-bugs at lists.llvm.org,
                    llvm-dev at redking.me.uk, spatel+llvm at rotateright.com

typedef double v2df __attribute__((vector_size(16)));

double bar (v2df x, int y)
  return x[y+1];

Clang -Ofast:
bar(double __vector(2), int):                           # @bar(double
__vector(2), int)
        add     edi, 1
        movaps  xmmword ptr [rsp - 24], xmm0
        and     edi, 1
        movsd   xmm0, qword ptr [rsp + 8*rdi - 24] # xmm0 = mem[0],zero

bar(double __vector(2), int):
        movsxd    rdi, edi                                      #4.1
        movups    XMMWORD PTR [-24+rsp], xmm0                   #4.1
        movsd     xmm0, QWORD PTR [-16+rsp+rdi*8]               #5.14


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