[llvm-bugs] [Bug 50247] New: [SIMD] calling math builtins (sqrt, ceil, floor, trunc, round) in loop not vectorized

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=50247

            Bug ID: 50247
           Summary: [SIMD] calling math builtins (sqrt, ceil, floor,
                    trunc, round) in loop not vectorized
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: WebAssembly
          Assignee: unassignedbugs at nondot.org
          Reporter: clang at evan.coeusgroup.com
                CC: llvm-bugs at lists.llvm.org

WASM SIMD128 includes several vector math functions which correspond to scalar
builtins in clang, but calling them for each element in a loop doesn't result
in the appropriate vector instruction.

Here is an example (also at https://godbolt.org/z/v95YvPTGe):


#include <wasm_simd128.h>

__f32x4
f32x4_sqrt(__f32x4 a) {
#if USE_BUILTIN
  return __builtin_wasm_sqrt_f32x4(a);
#else
  __f32x4 r;

  for (int i = 0 ; i < 4 ; i++) {
    r[i] = __builtin_sqrtf(a[i]);
  }

  return r;
#endif
}

__f64x2
f64x2_sqrt(__f64x2 a) {
#if USE_BUILTIN
  return __builtin_wasm_sqrt_f64x2(a);
#else
  __f64x2 r;

  for (int i = 0 ; i < 2 ; i++) {
    r[i] = __builtin_sqrt(a[i]);
  }

  return r;
#endif
}

__f32x4
f32x4_ceil(__f32x4 a) {
#if USE_BUILTIN
  return __builtin_wasm_ceil_f32x4(a);
#else
  __f32x4 r;

  for (int i = 0 ; i < 4 ; i++) {
    r[i] = __builtin_ceilf(a[i]);
  }

  return r;
#endif
}

__f64x2
f64x2_ceil(__f64x2 a) {
#if USE_BUILTIN
  return __builtin_wasm_ceil_f64x2(a);
#else
  __f64x2 r;

  for (int i = 0 ; i < 2 ; i++) {
    r[i] = __builtin_ceil(a[i]);
  }

  return r;
#endif
}

__f32x4
f32x4_floor(__f32x4 a) {
#if USE_BUILTIN
  return __builtin_wasm_floor_f32x4(a);
#else
  __f32x4 r;

  for (int i = 0 ; i < 4 ; i++) {
    r[i] = __builtin_floorf(a[i]);
  }

  return r;
#endif
}

__f64x2
f64x2_floor(__f64x2 a) {
#if USE_BUILTIN
  return __builtin_wasm_floor_f64x2(a);
#else
  __f64x2 r;

  for (int i = 0 ; i < 2 ; i++) {
    r[i] = __builtin_floor(a[i]);
  }

  return r;
#endif
}

__f32x4
f32x4_trunc(__f32x4 a) {
#if USE_BUILTIN
  return __builtin_wasm_trunc_f32x4(a);
#else
  __f32x4 r;

  for (int i = 0 ; i < 4 ; i++) {
    r[i] = __builtin_truncf(a[i]);
  }

  return r;
#endif
}

__f64x2
f64x2_trunc(__f64x2 a) {
#if USE_BUILTIN
  return __builtin_wasm_trunc_f64x2(a);
#else
  __f64x2 r;

  for (int i = 0 ; i < 2 ; i++) {
    r[i] = __builtin_trunc(a[i]);
  }

  return r;
#endif
}

__f32x4
f32x4_nearest(__f32x4 a) {
#if USE_BUILTIN
  return __builtin_wasm_nearest_f32x4(a);
#else
  __f32x4 r;

  for (int i = 0 ; i < 4 ; i++) {
    r[i] = __builtin_roundf(a[i]);
  }

  return r;
#endif
}

__f64x2
f64x2_nearest(__f64x2 a) {
#if USE_BUILTIN
  return __builtin_wasm_nearest_f64x2(a);
#else
  __f64x2 r;

  for (int i = 0 ; i < 2 ; i++) {
    r[i] = __builtin_round(a[i]);
  }

  return r;
#endif
}

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