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From: "vincenzo.innocente at cern dot ch" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/114943] New: X86 AVX2: inefficient code generated to
 convert SIMD Vectors
Date: Sat, 04 May 2024 13:10:59 +0000
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X-Bugzilla-Product: gcc
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X-Bugzilla-Version: 15.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114943

            Bug ID: 114943
           Summary: X86 AVX2: inefficient code generated to convert SIMD
                    Vectors
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: vincenzo.innocente at cern dot ch
  Target Milestone: ---

in the example below (see https://godbolt.org/z/qnfT4fE5G )
convert and covert3 produce code that looks to me inefficient w/r/t convert2
(and clang)  for target x86-64-v3

#define VECTOR_EXT(N) __attribute__((vector_size(N)))
typedef float VECTOR_EXT(16) float32x4_t;
typedef double VECTOR_EXT(32) float64x4_t;

float32x4_t f1,f2,f3,f4,f;
float64x4_t d1,d2,d3,d4,d;


void covert() {
   for (int i=3D0;i<4;++i) {
    d1[i] =3D f1[i];
    d2[i] =3D f2[i];
    d3[i] =3D f3[i];
    d4[i] =3D f4[i];
  }

}

void covert2() {
   for (int i=3D0;i<4;++i)
    d1[i] =3D f1[i];
     for (int i=3D0;i<4;++i)
    d2[i] =3D f2[i];
     for (int i=3D0;i<4;++i)
    d3[i] =3D f3[i];
     for (int i=3D0;i<4;++i)
    d4[i] =3D f4[i];
}



void covert3() {
  d1 =3D __builtin_convertvector(f1,float64x4_t);
}=