[LLVMbugs] [Bug 10088] New: compilation regression "fatal error: error in backend" building vxl

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=10088

           Summary: compilation regression "fatal error: error in backend"
                    building vxl
           Product: clang
           Version: trunk
          Platform: Macintosh
        OS/Version: MacOS X
            Status: NEW
          Severity: release blocker
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: sean at rogue-research.com
                CC: llvmbugs at cs.uiuc.edu


The open source project vxl builds with clang r130865.

It no longer builds with r132417.  I don't know exactly when this regression
occurred.

clang spews:

fatal error: error in backend: Cannot select: 0x1036ddc10: f32 =
X86ISD::FSETCCss 0x10371ec10, 0x1036dd310, 0x10372c910 [ID=26] dbg:/usr/
include/c++/4.2.1/complex:450:7
  0x10371ec10: f80,ch = load 0x103698a10:1, 0x103698a10,
0x10373ab10<LD10[%12](align=16)> [ORD=696] [ID=18] dbg:/usr/include/c++/
4.2.1/complex:450:7
    0x103698a10: i64,ch,glue = CopyFromReg 0x1036ddb10, 0x1036dd810,
0x1036ddb10:1 [ORD=694] [ID=16] dbg:/usr/include/c++/4.2.1/complex:450:7
      0x1036dd810: i64 = Register %RAX [ORD=694] [ID=6]
      0x1036ddb10: ch,glue = callseq_end 0x103698e10, 0x103698910,
0x103698910, 0x103698e10:1 [ORD=694] [ID=15]
        0x103698910: i64 = TargetConstant<0> [ORD=694] [ID=3]
        0x103698910: i64 = TargetConstant<0> [ORD=694] [ID=3]
        0x103698e10: ch,glue = X86ISD::CALL 0x103699610, 0x10371ef10,
0x10372c210, 0x103699610:1 [ORD=694] [ID=14] dbg:/usr/include/c++/4.2.1/
complex:450:7
          0x10371ef10: i64 = TargetGlobalAddress<x86_fp80*
(%"struct.std::complex"*)* @_ZNKSt7complexIeE4imagEv> 0 [ORD=694] [ID=5]
dbg:/usr/include/c++/4.2.1/complex:450:7
          0x10372c210: i64 = Register %RDI [ORD=694] [ID=4]
          0x103699610: ch,glue = CopyToReg 0x10373ad10, 0x10372c210,
0x103699010 [ORD=694] [ID=13] dbg:/usr/include/c++/4.2.1/complex:450:7
            0x10372c210: i64 = Register %RDI [ORD=694] [ID=4]
            0x103699010: i64,ch = load 0x103b38608, 0x10372c410,
0x10373ab10<LD8[%1]> [ORD=693] [ID=11] dbg:/usr/include/c++/4.2.1/
complex:450:7
              0x10372c410: i64 = FrameIndex<0> [ORD=693] [ID=1]
              0x10373ab10: i64 = undef [ORD=693] [ID=2]
    0x10373ab10: i64 = undef [ORD=693] [ID=2]
  0x1036dd310: f80,ch = load 0x103699110:1, 0x103699110,
0x10373ab10<LD10[%15](align=16)> [ORD=700] [ID=25] dbg:/usr/include/c++/
4.2.1/complex:450:7
    0x103699110: i64,ch,glue = CopyFromReg 0x103699510, 0x1036dd810,
0x103699510:1 [ORD=698] [ID=24] dbg:/usr/include/c++/4.2.1/complex:450:7
      0x1036dd810: i64 = Register %RAX [ORD=694] [ID=6]
      0x103699510: ch,glue = callseq_end 0x10371e410, 0x103698910,
0x103698910, 0x10371e410:1 [ORD=698] [ID=23]
        0x103698910: i64 = TargetConstant<0> [ORD=694] [ID=3]
        0x103698910: i64 = TargetConstant<0> [ORD=694] [ID=3]
        0x10371e410: ch,glue = X86ISD::CALL 0x10372bf10, 0x10371ef10,
0x10372c210, 0x10372bf10:1 [ORD=698] [ID=22] dbg:/usr/include/c++/4.2.1/
complex:450:7
          0x10371ef10: i64 = TargetGlobalAddress<x86_fp80*
(%"struct.std::complex"*)* @_ZNKSt7complexIeE4imagEv> 0 [ORD=694] [ID=5]
dbg:/usr/include/c++/4.2.1/complex:450:7
          0x10372c210: i64 = Register %RDI [ORD=694] [ID=4]
          0x10372bf10: ch,glue = CopyToReg 0x10372c810, 0x10372c210,
0x10373ae10 [ORD=698] [ID=21] dbg:/usr/include/c++/4.2.1/complex:450:7
            0x10372c210: i64 = Register %RDI [ORD=694] [ID=4]
            0x10373ae10: i64,ch = load 0x103698a10:1, 0x10372c710,
0x10373ab10<LD8[%2]> [ORD=697] [ID=17] dbg:/usr/include/c++/4.2.1/
complex:450:7
              0x10372c710: i64 = FrameIndex<1> [ORD=697] [ID=7]
              0x10373ab10: i64 = undef [ORD=693] [ID=2]
    0x10373ab10: i64 = undef [ORD=693] [ID=2]
  0x10372c910: i8 = Constant<0> [ID=9]

Stuart Hastings believes this is his fault.  As requested, attached is the .bc
file resulting from -emit-llvm.

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