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avcodec/ppc/fdctdsp: use M_SQRT2 instead of ad-hoc SQRT2
This actually fixes an incorrect float literal. It is believed by examining the precision that the literals were all pre-computed as floats, resulting in this needless loss of precision. There is no benefit to keeping such reduced precision: 1. These constants are used for static array computation, hence compile-time. 2. They will be treated as doubles anyway, since f specifier was not present. Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
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@ -44,20 +44,19 @@
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#define C5 0.55557024478912353515625000 /* cos(5 * PI / 16) */
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#define C6 0.38268342614173889160156250 /* cos(6 * PI / 16) */
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#define C7 0.19509032368659973144531250 /* cos(7 * PI / 16) */
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#define SQRT_2 1.41421353816986083984375000 /* sqrt(2) */
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#define W0 -(2 * C2)
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#define W1 (2 * C6)
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#define W2 (SQRT_2 * C6)
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#define W3 (SQRT_2 * C3)
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#define W4 (SQRT_2 * (-C1 + C3 + C5 - C7))
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#define W5 (SQRT_2 * (C1 + C3 - C5 + C7))
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#define W6 (SQRT_2 * (C1 + C3 + C5 - C7))
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#define W7 (SQRT_2 * (C1 + C3 - C5 - C7))
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#define W8 (SQRT_2 * (C7 - C3))
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#define W9 (SQRT_2 * (-C1 - C3))
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#define WA (SQRT_2 * (-C3 - C5))
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#define WB (SQRT_2 * (C5 - C3))
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#define W2 (M_SQRT2 * C6)
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#define W3 (M_SQRT2 * C3)
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#define W4 (M_SQRT2 * (-C1 + C3 + C5 - C7))
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#define W5 (M_SQRT2 * (C1 + C3 - C5 + C7))
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#define W6 (M_SQRT2 * (C1 + C3 + C5 - C7))
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#define W7 (M_SQRT2 * (C1 + C3 - C5 - C7))
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#define W8 (M_SQRT2 * (C7 - C3))
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#define W9 (M_SQRT2 * (-C1 - C3))
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#define WA (M_SQRT2 * (-C3 - C5))
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#define WB (M_SQRT2 * (C5 - C3))
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static const vector float fdctconsts[3] = {
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{ W0, W1, W2, W3 },
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