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glsl: Add "built-in" functions to do ffma(fp64)

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Definitely not actually a fused-multiply add.

Reviewed-by: Elie Tournier <tournier.elie@gmail.com>
This commit is contained in:
Matt Turner
2018-10-30 21:48:01 -07:00
parent 3db81b5d9f
commit 92ac2169fb
1 changed files with 6 additions and 0 deletions
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6
src/compiler/glsl/float64.glsl
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@@ -798,6 +798,12 @@ __fmul64(uint64_t a, uint64_t b)
return __roundAndPackFloat64(zSign, zExp, zFrac0, zFrac1, zFrac2); return __roundAndPackFloat64(zSign, zExp, zFrac0, zFrac1, zFrac2);
} }
uint64_t
__ffma64(uint64_t a, uint64_t b, uint64_t c)
{
return __fadd64(__fmul64(a, b), c);
}
/* Shifts the 64-bit value formed by concatenating `a0' and `a1' right by the /* Shifts the 64-bit value formed by concatenating `a0' and `a1' right by the
* number of bits given in `count'. Any bits shifted off are lost. The value * number of bits given in `count'. Any bits shifted off are lost. The value
* of `count' can be arbitrarily large; in particular, if `count' is greater * of `count' can be arbitrarily large; in particular, if `count' is greater