FWIW, this maps nicely to r600, which also has separate instructions
for the low and high 32 bits. As to what option is better, it really
depends on whether shading languages and OpenCL expose the
instructions directly through functions, or whether they just have
64-bit integers.
Marek
On Fri,
Not sure if this helps much, but...
With gentype being one of:
char, uchar, short, ushort, int, uint, long, ulong, and the widths
being scalar, 2, 3, 4, 8, or 16 components wide.
From the OpenCL 1.1 spec:
gentype mad_hi(gentype a, gentype b):
Computes x * y and returns the high half of the
Am 03.05.2013 06:58, schrieb Jose Fonseca:
- Original Message -
Currently, there's no way to get the high bits of a 32x32
signed/unsigned integer multiplication with tgsi. However, all of
d3d10, OpenGL, and OpenCL support that, so we need it as well.
There's essentially two ways
Yes, that's why I said it looks like separate low and high bits in
opencl. So in opencl you will get the low and high parts separately anyway.
If we have only one instruction, we also probably really wanted to be
able to say that we may only need one or the other destination to avoid
extra work,
- Original Message -
Am 03.05.2013 06:58, schrieb Jose Fonseca:
- Original Message -
Currently, there's no way to get the high bits of a 32x32
signed/unsigned integer multiplication with tgsi. However, all of
d3d10, OpenGL, and OpenCL support that, so we need it as
On 03.05.2013 16:32, Jose Fonseca wrote:
- Original Message -
Am 03.05.2013 06:58, schrieb Jose Fonseca:
- Original Message -
Currently, there's no way to get the high bits of a 32x32
signed/unsigned integer multiplication with tgsi. However, all of
d3d10, OpenGL, and
Am 03.05.2013 16:32, schrieb Jose Fonseca:
- Original Message -
Am 03.05.2013 06:58, schrieb Jose Fonseca:
- Original Message -
Currently, there's no way to get the high bits of a 32x32
signed/unsigned integer multiplication with tgsi. However, all of
d3d10, OpenGL, and
Am 03.05.2013 16:45, schrieb Christoph Bumiller:
On 03.05.2013 16:32, Jose Fonseca wrote:
- Original Message -
Am 03.05.2013 06:58, schrieb Jose Fonseca:
- Original Message -
Currently, there's no way to get the high bits of a 32x32
signed/unsigned integer multiplication
Currently, there's no way to get the high bits of a 32x32
signed/unsigned integer multiplication with tgsi.
However, all of d3d10, OpenGL, and OpenCL support that, so we need it as
well.
There's essentially two ways how it could be done:
- a 2-destination instruction returning both high and low
- Original Message -
Currently, there's no way to get the high bits of a 32x32
signed/unsigned integer multiplication with tgsi.
However, all of d3d10, OpenGL, and OpenCL support that, so we need it as
well.
There's essentially two ways how it could be done:
- a 2-destination
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