[LLVMbugs] [Bug 13961] New: [ARM, NEON] "cannot select" crash when using vector select instruction

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=13961

             Bug #: 13961
           Summary: [ARM,NEON] "cannot select" crash when using vector
                    select instruction
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: matt at pharr.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


With this short program:

; ModuleID = '<stdin>'
target datalayout =
"e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128-n8:16:32-S128"
target triple = "arm-apple-darwin12.1.0"

define <4 x i32> @foo___UM_vyivyi(<4 x i32> %a, <4 x i32> %b) nounwind {
allocas:
  %a.lobit15 = lshr <4 x i32> %a, <i32 31, i32 31, i32 31, i32 31>
  %0 = and <4 x i32> %a.lobit15, <i32 1, i32 1, i32 1, i32 1>
  %m1.i = icmp ne <4 x i32> %0, zeroinitializer
  %v1.i = select <4 x i1> %m1.i, <4 x i32> %a, <4 x i32> %b
  ret <4 x i32> %v1.i
}

I get a crash with top-of-tree if I compile as follows:

% llc -mcpu=cortex-a9 -mattr=+neon bug-1.ll
LLVM ERROR: Cannot select: 0x7fa9f8831810: v4i32 = vselect 0x7fa9f8830810,
0x7fa9f8830c10, 0x7fa9f8831510 [ORD=4] [ID=28]
  0x7fa9f8830810: v4i32 = ARMISD::VTST 0x7fa9f8833a10, 0x7fa9f8831610 [ID=27]
    0x7fa9f8833a10: v4i32 = ARMISD::VSHRu 0x7fa9f8830c10, 0x7fa9f8831010
[ID=26]
      0x7fa9f8830c10: v4i32 = bitcast 0x7fa9f8831410 [ORD=1] [ID=25]
        0x7fa9f8831410: v2f64 = ARMISD::BUILD_VECTOR 0x7fa9f8830010,
0x7fa9f8830510 [ID=24]
          0x7fa9f8830010: f64 = ARMISD::VMOVDRR 0x7fa9f882fd10, 0x7fa9f882ff10
[ORD=1] [ID=21]
            0x7fa9f882fd10: i32,ch = CopyFromReg 0x7fa9f8411220, 0x7fa9f882fc10
[ORD=1] [ID=15]
              0x7fa9f882fc10: i32 = Register %vreg0 [ORD=1] [ID=1]
            0x7fa9f882ff10: i32,ch = CopyFromReg 0x7fa9f8411220, 0x7fa9f882fe10
[ORD=1] [ID=16]
              0x7fa9f882fe10: i32 = Register %vreg1 [ORD=1] [ID=2]
          0x7fa9f8830510: f64 = ARMISD::VMOVDRR 0x7fa9f8830210, 0x7fa9f8830410
[ORD=1] [ID=22]
            0x7fa9f8830210: i32,ch = CopyFromReg 0x7fa9f8411220, 0x7fa9f8830110
[ORD=1] [ID=17]
              0x7fa9f8830110: i32 = Register %vreg2 [ORD=1] [ID=3]
            0x7fa9f8830410: i32,ch = CopyFromReg 0x7fa9f8411220, 0x7fa9f8830310
[ORD=1] [ID=18]
              0x7fa9f8830310: i32 = Register %vreg3 [ORD=1] [ID=4]
      0x7fa9f8831010: i32 = Constant<31> [ORD=1] [ID=9]
    0x7fa9f8831610: v4i32 = ARMISD::VMOVIMM 0x7fa9f8830f10 [ID=20]
      0x7fa9f8830f10: i32 = TargetConstant<1> [ID=14]
  0x7fa9f8830c10: v4i32 = bitcast 0x7fa9f8831410 [ORD=1] [ID=25]
    0x7fa9f8831410: v2f64 = ARMISD::BUILD_VECTOR 0x7fa9f8830010, 0x7fa9f8830510
[ID=24]
      0x7fa9f8830010: f64 = ARMISD::VMOVDRR 0x7fa9f882fd10, 0x7fa9f882ff10
[ORD=1] [ID=21]
        0x7fa9f882fd10: i32,ch = CopyFromReg 0x7fa9f8411220, 0x7fa9f882fc10
[ORD=1] [ID=15]
          0x7fa9f882fc10: i32 = Register %vreg0 [ORD=1] [ID=1]
        0x7fa9f882ff10: i32,ch = CopyFromReg 0x7fa9f8411220, 0x7fa9f882fe10
[ORD=1] [ID=16]
          0x7fa9f882fe10: i32 = Register %vreg1 [ORD=1] [ID=2]
      0x7fa9f8830510: f64 = ARMISD::VMOVDRR 0x7fa9f8830210, 0x7fa9f8830410
[ORD=1] [ID=22]
        0x7fa9f8830210: i32,ch = CopyFromReg 0x7fa9f8411220, 0x7fa9f8830110
[ORD=1] [ID=17]
          0x7fa9f8830110: i32 = Register %vreg2 [ORD=1] [ID=3]
        0x7fa9f8830410: i32,ch = CopyFromReg 0x7fa9f8411220, 0x7fa9f8830310
[ORD=1] [ID=18]
          0x7fa9f8830310: i32 = Register %vreg3 [ORD=1] [ID=4]
  0x7fa9f8831510: v4i32 = bitcast 0x7fa9f8830610 [ID=23]
    0x7fa9f8830610: v2f64,ch = load 0x7fa9f8411220, 0x7fa9f8830d10,
0x7fa9f8830e10<LD16[FixedStack-1](align=4)> [ID=19]
      0x7fa9f8830d10: i32 = FrameIndex<-1> [ORD=4] [ID=7]
      0x7fa9f8830e10: i32 = undef [ORD=4] [ID=8]
In function: foo___UM_vyivyi

(When fixed, it'd be nice if this was turned into a VBSL instruction..)

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