[llvm-bugs] [Bug 32654] New: Clang hangs compiling ARM inline assembly, with instruction on unsupported target

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=32654

            Bug ID: 32654
           Summary: Clang hangs compiling ARM inline assembly, with
                    instruction on unsupported target
           Product: new-bugs
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: kongy.dev at gmail.com
                CC: llvm-bugs at lists.llvm.org

$ cat test.cc
float sqrtf(float x) {
  __asm__("vsqrt.f32 %0, %1"
          : "=t"(x)
          : "t"(x));
  return x;
}

$ ~/llvm/build/bin/clang --target=armv5-linux-gnueabi test.c -S -o -
        .text
        .syntax unified
        .eabi_attribute 67, "2.09"      @ Tag_conformance
        .cpu    arm10tdmi
        .eabi_attribute 6, 3    @ Tag_CPU_arch
        .eabi_attribute 8, 1    @ Tag_ARM_ISA_use
        .eabi_attribute 17, 1   @ Tag_ABI_PCS_GOT_use
        .eabi_attribute 20, 1   @ Tag_ABI_FP_denormal
        .eabi_attribute 21, 1   @ Tag_ABI_FP_exceptions
        .eabi_attribute 23, 3   @ Tag_ABI_FP_number_model
        .eabi_attribute 34, 0   @ Tag_CPU_unaligned_access
        .eabi_attribute 24, 1   @ Tag_ABI_align_needed
        .eabi_attribute 25, 1   @ Tag_ABI_align_preserved
        .eabi_attribute 38, 1   @ Tag_ABI_FP_16bit_format
        .eabi_attribute 18, 4   @ Tag_ABI_PCS_wchar_t
        .eabi_attribute 26, 2   @ Tag_ABI_enum_size
        .eabi_attribute 14, 0   @ Tag_ABI_PCS_R9_use
        .file   "test3.c"
clang-5.0:
/usr/local/google/home/yikong/llvm/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp:392:
void getCopyToParts(llvm::SelectionDAG &, const llvm::SDLoc &, llvm::SDValue,
llvm::SDValue *, unsigned int, llvm::MVT, const llvm::Value *, ISD::NodeType):
Assertion `DAG.getTargetLoweringInfo().isTypeLegal(PartVT) && "Copying to an
illegal type!"' failed.
(hangs)

vsqrt instruction does not exist for armv5, this should throw an error instead
of compiler internal assertion failure and hanging.

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