TheRock/compiler/amd-llvm/clang/test/CodeGen/X86/f16c-builtins.c

// RUN: %clang_cc1 -x c -ffreestanding %s -triple=x86_64-apple-darwin -target-feature +f16c -emit-llvm -o - -Wall -Werror | FileCheck %s
// RUN: %clang_cc1 -x c -ffreestanding %s -triple=i386-apple-darwin -target-feature +f16c -emit-llvm -o - -Wall -Werror | FileCheck %s
// RUN: %clang_cc1 -x c++ -ffreestanding %s -triple=x86_64-apple-darwin -target-feature +f16c -emit-llvm -o - -Wall -Werror | FileCheck %s
// RUN: %clang_cc1 -x c++ -ffreestanding %s -triple=i386-apple-darwin -target-feature +f16c -emit-llvm -o - -Wall -Werror | FileCheck %s

// RUN: %clang_cc1 -x c -ffreestanding %s -triple=x86_64-apple-darwin -target-feature +f16c -emit-llvm -o - -Wall -Werror -fexperimental-new-constant-interpreter | FileCheck %s
// RUN: %clang_cc1 -x c -ffreestanding %s -triple=i386-apple-darwin -target-feature +f16c -emit-llvm -o - -Wall -Werror -fexperimental-new-constant-interpreter | FileCheck %s
// RUN: %clang_cc1 -x c++ -ffreestanding %s -triple=x86_64-apple-darwin -target-feature +f16c -emit-llvm -o - -Wall -Werror -fexperimental-new-constant-interpreter | FileCheck %s
// RUN: %clang_cc1 -x c++ -ffreestanding %s -triple=i386-apple-darwin -target-feature +f16c -emit-llvm -o - -Wall -Werror -fexperimental-new-constant-interpreter | FileCheck %s


#include <immintrin.h>
#include "builtin_test_helpers.h"

float test_cvtsh_ss(unsigned short a) {
  // CHECK-LABEL: test_cvtsh_ss
  // CHECK: [[CONV:%.*]] = fpext half %{{.*}} to float
  // CHECK: ret float [[CONV]]
  return _cvtsh_ss(a);
}

TEST_CONSTEXPR(_cvtsh_ss(0x0000) == 0.0f);
TEST_CONSTEXPR(_cvtsh_ss(0x4500) == 5.0f);
TEST_CONSTEXPR(_cvtsh_ss(0xC000) == -2.0f);

unsigned short test_cvtss_sh(float a) {
  // CHECK-LABEL: test_cvtss_sh
  // CHECK: insertelement <4 x float> poison, float %{{.*}}, i32 0
  // CHECK: insertelement <4 x float> %{{.*}}, float 0.000000e+00, i32 1
  // CHECK: insertelement <4 x float> %{{.*}}, float 0.000000e+00, i32 2
  // CHECK: insertelement <4 x float> %{{.*}}, float 0.000000e+00, i32 3
  // CHECK: call <8 x i16> @llvm.x86.vcvtps2ph.128(<4 x float> %{{.*}}, i32 0)
  // CHECK: extractelement <8 x i16> %{{.*}}, i32 0
  return _cvtss_sh(a, 0);
}

TEST_CONSTEXPR(match_m128(
    _mm_cvtph_ps(_mm_setr_epi16(0x3C00, 0x4000, 0x4200, 0x4400, 0, 0, 0, 0)), 
    1.0f, 2.0f, 3.0f, 4.0f
));

__m128 test_mm_cvtph_ps(__m128i a) {
  // CHECK-LABEL: test_mm_cvtph_ps
  // CHECK: shufflevector <8 x i16> %{{.*}}, <8 x i16> %{{.*}}, <4 x i32> <i32 0, i32 1, i32 2, i32 3>
  // CHECK: fpext <4 x half> %{{.*}} to <4 x float>
  return _mm_cvtph_ps(a);
}

// A value exactly halfway between 1.0 and the next representable FP16 number.
// In binary, its significand ends in ...000, followed by a tie-bit 1.
#define POS_HALFWAY (1.0f + 0.00048828125f) // 1.0 + 2^-11, a tie-breaking case

//
// _mm_cvtps_ph (128-bit, 4 floats -> 8 shorts, 4 are zero-padded)
//
// Test values: -2.5f, 1.123f, POS_HALFWAY
TEST_CONSTEXPR(match_v8hi(
  _mm_cvtps_ph(_mm_setr_ps(-2.5f, 1.123f, POS_HALFWAY, 0.0f), _MM_FROUND_TO_NEAREST_INT),
  0xC100, 0x3C7E, 0x3C00, 0x0000, 0, 0, 0, 0
));
TEST_CONSTEXPR(match_v8hi(
  _mm_cvtps_ph(_mm_setr_ps(-2.5f, 1.123f, POS_HALFWAY, 0.0f), _MM_FROUND_TO_NEG_INF),
  0xC100, 0x3C7D, 0x3C00, 0x0000, 0, 0, 0, 0
));
TEST_CONSTEXPR(match_v8hi(
  _mm_cvtps_ph(_mm_setr_ps(-2.5f, 1.123f, POS_HALFWAY, 0.0f), _MM_FROUND_TO_POS_INF),
  0xC100, 0x3C7E, 0x3C01, 0x0000, 0, 0, 0, 0
));
TEST_CONSTEXPR(match_v8hi(
  _mm_cvtps_ph(_mm_setr_ps(-2.5f, 1.123f, POS_HALFWAY, 0.0f), _MM_FROUND_TO_ZERO),
  0xC100, 0x3C7D, 0x3C00, 0x0000, 0, 0, 0, 0
));

__m256 test_mm256_cvtph_ps(__m128i a) {
  // CHECK-LABEL: test_mm256_cvtph_ps
  // CHECK: fpext <8 x half> %{{.*}} to <8 x float>
  return _mm256_cvtph_ps(a);
}
TEST_CONSTEXPR(match_m256(
    _mm256_cvtph_ps(_mm_setr_epi16(0x3C00, 0x4000, 0x4200, 0x4400, 0x4500, 0x3800, 0xC000, 0x0000)), 
    1.0f, 2.0f, 3.0f, 4.0f, 5.0f, 0.5f, -2.0f, 0.0f
));

//
// _mm256_cvtps_ph (256-bit, 8 floats -> 8 shorts)
//
// Test values: -2.5f, 1.123f, POS_HALFWAY
TEST_CONSTEXPR(match_v8hi(
  _mm256_cvtps_ph(_mm256_setr_ps(-2.5f, 1.123f, POS_HALFWAY, 0.0f, -2.5f, 1.123f, POS_HALFWAY, 0.0f), _MM_FROUND_TO_NEAREST_INT),
  0xC100, 0x3C7E, 0x3C00, 0x0000, 0xC100, 0x3C7E, 0x3C00, 0x0000
));
TEST_CONSTEXPR(match_v8hi(
  _mm256_cvtps_ph(_mm256_setr_ps(-2.5f, 1.123f, POS_HALFWAY, 0.0f, -2.5f, 1.123f, POS_HALFWAY, 0.0f), _MM_FROUND_TO_NEG_INF),
  0xC100, 0x3C7D, 0x3C00, 0x0000, 0xC100, 0x3C7D, 0x3C00, 0x0000
));
TEST_CONSTEXPR(match_v8hi(
  _mm256_cvtps_ph(_mm256_setr_ps(-2.5f, 1.123f, POS_HALFWAY, 0.0f, -2.5f, 1.123f, POS_HALFWAY, 0.0f), _MM_FROUND_TO_POS_INF),
  0xC100, 0x3C7E, 0x3C01, 0x0000, 0xC100, 0x3C7E, 0x3C01, 0x0000
));
TEST_CONSTEXPR(match_v8hi(
  _mm256_cvtps_ph(_mm256_setr_ps(-2.5f, 1.123f, POS_HALFWAY, 0.0f, -2.5f, 1.123f, POS_HALFWAY, 0.0f), _MM_FROUND_TO_ZERO),
  0xC100, 0x3C7D, 0x3C00, 0x0000, 0xC100, 0x3C7D, 0x3C00, 0x0000
));

__m128i test_mm_cvtps_ph(__m128 a) {
  // CHECK-LABEL: test_mm_cvtps_ph
  // CHECK: call <8 x i16> @llvm.x86.vcvtps2ph.128(<4 x float> %{{.*}}, i32 0)
  return _mm_cvtps_ph(a, 0);
}

//
// Tests for Exact Dynamic Rounding
//
// Test that dynamic rounding SUCCEEDS for exactly representable values.
// We use _MM_FROUND_CUR_DIRECTION (value 4) to specify dynamic rounding.
// Inputs: -2.5f, 0.125f, -16.0f are all exactly representable in FP16.
TEST_CONSTEXPR(match_v8hi(
  __builtin_ia32_vcvtps2ph256(_mm256_setr_ps(-2.5f, 0.125f, -16.0f, 0.0f, -2.5f, 0.125f, -16.0f, 0.0f), _MM_FROUND_CUR_DIRECTION),
  0xC100, 0x3000, 0xCC00, 0x0000, 0xC100, 0x3000, 0xCC00, 0x0000
));

__m128i test_mm256_cvtps_ph(__m256 a) {
  // CHECK-LABEL: test_mm256_cvtps_ph
  // CHECK: call <8 x i16> @llvm.x86.vcvtps2ph.256(<8 x float> %{{.*}}, i32 0)
  return _mm256_cvtps_ph(a, 0);
}