[LLVMbugs] [Bug 22774] New: Vector widening code gen error

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=22774

            Bug ID: 22774
           Summary: Vector widening code gen error
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: Wolfgang_Pieb at playstation.sony.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

@id9883 = global <4 x i64> <i64 -1, i64 -1, i64 -1, i64 -1>, align 32
@id9881 = global <2 x i64> zeroinitializer, align 16

define i32 @_Z3foov() #0 {
entry:
  %0 = load <4 x i64>, <4 x i64>* @id9883, align 32
  %vecext = extractelement <4 x i64> %0, i32 0
  %vecinit = insertelement <2 x i64> undef, i64 %vecext, i32 0
  %vecinit1 = insertelement <2 x i64> %vecinit, i64 0, i32 1
  store <2 x i64> %vecinit1, <2 x i64>* @id9881, align 16
  ret i32 0
}


; llc -march=x86-64 -mattr=avx
;
; does not zero out the upper bits of the result despite 
; %vecinit1 = insertelement <2 x i64> %vecinit, i64 0, i32 1
; 
; generating the following code:
;
; vmovaps id9883(%rip), %ymm0
; vextractf128    $1, %ymm0, %xmm1
; vpblendw        $240, %xmm1, %xmm0, %xmm0 # xmm0 =
xmm0[0,1,2,3],xmm1[4,5,6,7]
; vmovdqa %xmm0, id9881(%rip)
;
; Seems to have started with r224429.
; 
; The test case is a simplification from a use of the builtin 
; _mm_cvtsi64_si128.

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