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@@ -39,6 +39,8 @@
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#define NEED_SCALAR_CONVERTER_FALLBACKS 1
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#endif
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+#define DIVBY2147483648 0.0000000004656612873077392578125f /* 0x1p-31f */
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+
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#if NEED_SCALAR_CONVERTER_FALLBACKS
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/* This code requires that floats are in the IEEE-754 binary32 format */
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@@ -101,7 +103,7 @@ static void SDL_Convert_S32_to_F32_Scalar(float *dst, const Sint32 *src, int num
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LOG_DEBUG_AUDIO_CONVERT("S32", "F32");
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for (i = num_samples - 1; i >= 0; --i) {
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- dst[i] = (float)src[i] * 0x1p-31f;
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+ dst[i] = (float)src[i] * DIVBY2147483648;
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}
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}
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@@ -319,7 +321,7 @@ static void SDL_TARGETING("sse2") SDL_Convert_S32_to_F32_SSE2(float *dst, const
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int i = num_samples;
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/* dst[i] = f32(src[i]) / f32(0x80000000) */
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- const __m128 scaler = _mm_set1_ps(0x1p-31f);
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+ const __m128 scaler = _mm_set1_ps(DIVBY2147483648);
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LOG_DEBUG_AUDIO_CONVERT("S32", "F32 (using SSE2)");
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@@ -493,7 +495,7 @@ static void SDL_TARGETING("sse2") SDL_Convert_F32_to_S32_SSE2(Sint32 *dst, const
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* 2) Convert to integer (values too small/large become 0x80000000 = -2147483648)
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* 3) Fixup values which were too large (0x80000000 ^ 0xFFFFFFFF = 2147483647)
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* dst[i] = i32(src[i] * 2147483648.0) ^ ((src[i] >= 2147483648.0) ? 0xFFFFFFFF : 0x00000000) */
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- const __m128 limit = _mm_set1_ps(0x1p31f);
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+ const __m128 limit = _mm_set1_ps(2147483648.0f);
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LOG_DEBUG_AUDIO_CONVERT("F32", "S32 (using SSE2)");
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@@ -537,9 +539,9 @@ static void SDL_TARGETING("sse2") SDL_Convert_F32_to_S32_SSE2(Sint32 *dst, const
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#endif
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#ifdef SDL_NEON_INTRINSICS
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-#define DIVBY128 0x1p-7f
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-#define DIVBY32768 0x1p-15f
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-#define DIVBY8388607 0x1.000002p-23f
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+#define DIVBY128 0.0078125f /* 0x1p-7f */
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+#define DIVBY32768 0.000030517578125f /* 0x1p-15f */
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+#define DIVBY8388607 0.00000011920930376163766f /* 0x1.000002p-23f */
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static void SDL_Convert_S8_to_F32_NEON(float *dst, const Sint8 *src, int num_samples)
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{
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