[LLVMbugs] [Bug 23244] New: [QoI] Improve failure when trying to bind float types to integer registers for IAS in hardfp mode

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23244

            Bug ID: 23244
           Summary: [QoI] Improve failure when trying to bind float types
                    to integer registers for IAS in hardfp mode
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: ARM
          Assignee: unassignedbugs at nondot.org
          Reporter: joerg at NetBSD.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Test case from Firefox:

int a, b, c, d, g, h, i;
double e;
struct A {
  static int m_fn1(int) {
    asm("" : "=r"(a), "=&r"(b), "=&r"(c), "=&r"(d), "=&r"(e) : "4"(e));
  }
};
struct Shuffle {
  static int m_fn2(int) { A::m_fn1(0); }
} *f;
template <typename, typename, typename>
void FuncShuffle(int *, unsigned, int *) {
  f[Shuffle::m_fn2(0)];
}

void simd_int32x4_shuffleMix() { FuncShuffle<A, Shuffle, A>(&g, h, &i); }

This currently fails with an assertion (SelectionDAGBuilder.cpp:398, void
getCopyToParts(llvm::SelectionDAG&, llvm::SDLoc, llvm::SDValue, llvm::SDValue*,
unsigned int, llvm::MVT, const llvm::Value*, llvm::ISD::NodeType): Assertion
`(PartVT.isInteger() || PartVT == MVT::x86mmx) && ValueVT.isInteger() &&
"Unknown mismatch!"' failed). It should be properly detected.

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