[llvm-bugs] [Bug 42010] New: [ppc64] After r340469, Assertion failed: (!TLI.isOperationLegalOrCustom(N->getOpcode(), WideVecVT) && "Target supports vector op, but scalar requires expansion?"), function WidenVectorResult, file LegalizeVectorTypes.cpp, line 2452

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https://bugs.llvm.org/show_bug.cgi?id=42010

            Bug ID: 42010
           Summary: [ppc64] After r340469, Assertion failed:
                    (!TLI.isOperationLegalOrCustom(N->getOpcode(),
                    WideVecVT) && "Target supports vector op, but scalar
                    requires expansion?"), function WidenVectorResult,
                    file LegalizeVectorTypes.cpp, line 2452
           Product: new-bugs
           Version: 8.0
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: dimitry at andric.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

As reported in https://bugs.freebsd.org/238082, compiling the graphics/mesa-dri
port for PowerPC64 results in:

Assertion failed: (!TLI.isOperationLegalOrCustom(N->getOpcode(), WideVecVT) &&
"Target supports vector op, but scalar requires expansion?"), function
WidenVectorResult, file lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp, line
2452.

Bisection shows this is a regression caused by
https://reviews.llvm.org/rL340469 ("[SelectionDAG] unroll unsupported vector FP
ops earlier to avoid libcalls on undef elements (bug 38527)").

Minimized test case:

// clang -cc1 -triple powerpc64-- -S -relaxed-aliasing -target-cpu ppc64 -O2
-vectorize-loops nir_constant_expressions-min.c
typedef struct {
  double a[4];
} b;
int c, e;
b *d;
float truncf(float);
void f() {
  for (unsigned g = 0; g < c; g++) {
    double a = truncf(d[1].a[g]);
    e = a;
  }
}

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