Extended Description

The testcase in platform-independent fix rL231984 reveals possible issues with R600 backend.

The below lines are identical to test/CodeGen/X86/getelementptr.ll

; RUN: llc < %s -O0 -march=r600
; RUN: llc < %s -O2 -march=r600

define i8* @​test_trunc65(i8* %ptr) nounwind {
; CHECK-LABEL: test_trunc65
; CHECK: 3
%d = getelementptr i8, i8* %ptr, i65 18446744073709551619 ; 2^64 + 3
ret i8* %d
}

define i8* @​test_trunc128(i8* %ptr) nounwind {
; CHECK-LABEL: test_trunc128
; CHECK: 5
%d = getelementptr i8, i8* %ptr, i128 18446744073709551621 ; 2^64 + 5
ret i8* %d
}

define i8* @​test_trunc160(i8* %ptr) nounwind {
; CHECK-LABEL: test_trunc160
; CHECK: 8
%d = getelementptr i8, i8* %ptr, i160 18446744073709551624 ; 2^64 + 8
ret i8* %d
}

define i8* @​test_trunc256(i8* %ptr) nounwind {
; CHECK-LABEL: test_trunc256
; CHECK: 13
%d = getelementptr i8, i8* %ptr, i256 18446744073709551629 ; 2^64 + 13
ret i8* %d
}

define i8* @​test_trunc2048(i8* %ptr) nounwind {
; CHECK-LABEL: test_trunc2048
; CHECK: 21
%d = getelementptr i8, i8* %ptr, i2048 18446744073709551637 ; 2^64 + 21
ret i8* %d
}

; Test small index sext to pointer size

define i8* @​test_sext3(i8* %ptr) nounwind {
; CHECK-LABEL: test_sext3
; CHECK: -3
%d = getelementptr i8, i8* %ptr, i3 -3
ret i8* %d
}

define i8* @​test_sext5(i8* %ptr) nounwind {
; CHECK-LABEL: test_sext5
; CHECK: -5
%d = getelementptr i8, i8* %ptr, i5 -5
ret i8* %d
}

define i8* @​test_sext8(i8* %ptr) nounwind {
; CHECK-LABEL: test_sext8
; CHECK: -8
%d = getelementptr i8, i8* %ptr, i8 -8
ret i8* %d
}

define i8* @​test_sext13(i8* %ptr) nounwind {
; CHECK-LABEL: test_sext13
; CHECK: -13
%d = getelementptr i8, i8* %ptr, i8 -13
ret i8* %d
}

define i8* @​test_sext16(i8* %ptr) nounwind {
; CHECK-LABEL: test_sext16
; CHECK: -21
%d = getelementptr i8, i8* %ptr, i8 -21
ret i8* %d
}

backtrace:
$llc -O0 -march=r600

Not Implemented
UNREACHABLE executed at /home/ch/sources-llvm/llvm/lib/Target/R600/AMDGPUInstrInfo.cpp:97!
#​0 0x1e6902e llvm::sys::PrintStackTrace(llvm::raw_ostream&) /home/ch/sources-llvm/llvm/lib/Support/Unix/Signals.inc:424:15
#​1 0x1e69fa9 PrintStackTraceSignalHandler(void*) /home/ch/sources-llvm/llvm/lib/Support/Unix/Signals.inc:483:1
#​2 0x1e6a483 SignalHandler(int) /home/ch/sources-llvm/llvm/lib/Support/Unix/Signals.inc:199:60
#​3 0x7f6b0c99a8d0 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0xf8d0)
#​4 0x7f6b0bbda107 gsignal /build/glibc-Ir_s5K/glibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#​5 0x7f6b0bbdb4e8 abort /build/glibc-Ir_s5K/glibc-2.19/stdlib/abort.c:91:0
#​6 0x1e1b356 (/home/ch/build-debug/bin/llc+0x1e1b356)
#​7 0xf081e8 /home/ch/sources-llvm/llvm/lib/Target/R600/AMDGPUInstrInfo.cpp:97:3
#​8 0x168d423 (anonymous namespace)::RAFast::spillVirtReg(llvm::MachineBasicBlock::bundle_iterator<llvm::MachineInstr, llvm::ilist_iteratorllvm::MachineInstr >, (anonymous namespace)::RAFast::LiveReg*) /home/ch/sources-llvm/llvm/lib/CodeGen/RegAllocFast.cpp:290:5
#​9 0x168b63b (anonymous namespace)::RAFast::spillAll(llvm::MachineBasicBlock::bundle_iterator<llvm::MachineInstr, llvm::ilist_iteratorllvm::MachineInstr >) /home/ch/sources-llvm/llvm/lib/CodeGen/RegAllocFast.cpp:334:16
#​10 0x1689914 (anonymous namespace)::RAFast::AllocateBasicBlock() /home/ch/sources-llvm/llvm/lib/CodeGen/RegAllocFast.cpp:1067:3
#​11 0x1687e50 (anonymous namespace)::RAFast::runOnMachineFunction(llvm::MachineFunction&) /home/ch/sources-llvm/llvm/lib/CodeGen/RegAllocFast.cpp:1103:5
#​12 0x15e142e llvm::MachineFunctionPass::runOnFunction(llvm::Function&) /home/ch/sources-llvm/llvm/lib/CodeGen/MachineFunctionPass.cpp:40:3
#​13 0x19bd31d llvm::FPPassManager::runOnFunction(llvm::Function&) /home/ch/sources-llvm/llvm/lib/IR/LegacyPassManager.cpp:1538:23
#​14 0x19bd628 llvm::FPPassManager::runOnModule(llvm::Module&) /home/ch/sources-llvm/llvm/lib/IR/LegacyPassManager.cpp:1558:16
#​15 0x19bdce9 (anonymous namespace)::MPPassManager::runOnModule(llvm::Module&) /home/ch/sources-llvm/llvm/lib/IR/LegacyPassManager.cpp:1616:23
#​16 0x19bd8de llvm::legacy::PassManagerImpl::run(llvm::Module&) /home/ch/sources-llvm/llvm/lib/IR/LegacyPassManager.cpp:1723:16
#​17 0x19be191 llvm::legacy::PassManager::run(llvm::Module&) /home/ch/sources-llvm/llvm/lib/IR/LegacyPassManager.cpp:1756:3
#​18 0x784481 compileModule(char**, llvm::LLVMContext&) /home/ch/sources-llvm/llvm/tools/llc/llc.cpp:378:3
#​19 0x7832f6 main /home/ch/sources-llvm/llvm/tools/llc/llc.cpp:201:13
#​20 0x7f6b0bbc6b45 __libc_start_main /build/glibc-Ir_s5K/glibc-2.19/csu/libc-start.c:321:0
#​21 0x783014 _start (/home/ch/build-debug/bin/llc+0x783014)
Stack dump:
0. Program arguments: /home/ch/build-debug/bin/llc -O0 -march=r600

1. Running pass 'Function Pass Manager' on module ''.
2. Running pass 'Fast Register Allocator' on function '@test_trunc65'

$llc -O2 -march=r600 seems fine

I used a llvm trunk/235497 built on Linux.