[LLVMbugs] [Bug 24073] New: fix for #22563 discards the upper half of (non-array) __m256 objects

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=24073

            Bug ID: 24073
           Summary: fix for #22563 discards the upper half of (non-array)
                    __m256 objects
           Product: clang
           Version: 3.6
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: kretz at kde.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

The following testcase, compiled with -mavx at any optimization level fails:
#include <x86intrin.h>
class V {
  __m256 d;
public:
  [[gnu::noinline]] V(__m256 x) : d(x) {}
  bool verify() const {
    return 0xff == _mm256_movemask_ps(_mm256_cmp_ps(d, _mm256_set1_ps(1.f),
_CMP_EQ_OQ));
  }
};
V foo() { return _mm256_set1_ps(1.f); }
int main() { return foo().verify() ? 0 : 1; }

After the V::V constructor, clang emits "vmovaps (%rsp),%xmm0" instead of
"vmovaps (%rsp),%ymm0". Reverting bce1e8184fcb311e1ec3cbf03247bdf24e91d5e2
(r229408 in SVN) solves the issue.

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