On 04.04.2013 03:45, Zack Rusin wrote:
It's part of SM4 (http://goo.gl/4IpeK). It's also fairly
painful to emulate without branching. Most hardware
supports it natively and even llvm has a 'select' opcode
which can handle it without too much hassle.
diff --git
On 04.04.2013 03:45, Zack Rusin wrote:
It's part of SM4 (http://goo.gl/4IpeK). It's also fairly
painful to emulate without branching. Most hardware
supports it natively and even llvm has a 'select' opcode
which can handle it without too much hassle.
diff --git
On 04.04.2013 16:53, Zack Rusin wrote:
On 04.04.2013 03:45, Zack Rusin wrote:
It's part of SM4 (http://goo.gl/4IpeK). It's also fairly
painful to emulate without branching. Most hardware
supports it natively and even llvm has a 'select' opcode
which can handle it without too much hassle.
On 04.04.2013 17:01, Jose Fonseca wrote:
- Original Message -
On 04.04.2013 03:45, Zack Rusin wrote:
It's part of SM4 (http://goo.gl/4IpeK). It's also fairly
painful to emulate without branching. Most hardware
supports it natively and even llvm has a 'select' opcode
which can handle
- Original Message -
On 04.04.2013 17:01, Jose Fonseca wrote:
- Original Message -
On 04.04.2013 03:45, Zack Rusin wrote:
It's part of SM4 (http://goo.gl/4IpeK). It's also fairly
painful to emulate without branching. Most hardware
supports it natively and even llvm
Erm, unsigned 0 doesn't make sense.
Ah indeed!
Definitely what the description says:
static void
micro_ucmp(union tgsi_exec_channel *dst,
const union tgsi_exec_channel *src0,
const union tgsi_exec_channel *src1,
const union tgsi_exec_channel
On 04.04.2013 17:23, Jose Fonseca wrote:
- Original Message -
On 04.04.2013 17:01, Jose Fonseca wrote:
- Original Message -
On 04.04.2013 03:45, Zack Rusin wrote:
It's part of SM4 (http://goo.gl/4IpeK). It's also fairly
painful to emulate without branching. Most hardware
- Original Message -
Erm, unsigned 0 doesn't make sense.
Ah indeed!
Definitely what the description says:
static void
micro_ucmp(union tgsi_exec_channel *dst,
const union tgsi_exec_channel *src0,
const union tgsi_exec_channel *src1,
Hah, yea, I'm sorry, that's a good point. So movc is a bitcast to unsigned
followed by ucmp. Alright, I'm withdrawing the patch.
z
- Original Message -
- Original Message -
Erm, unsigned 0 doesn't make sense.
Ah indeed!
Definitely what the description
There might be some value in renaming UCMP to be MOVC though. I think
everybody here can agree that UCMP, though semantically correct, is misleading.
Jose
- Original Message -
Hah, yea, I'm sorry, that's a good point. So movc is a bitcast to unsigned
followed by ucmp. Alright, I'm
FWIW it looks like we could use that opcode a bit more in glsl to tgsi
translation. There's one use of it in st_glsl_to_tgsi.cpp (though
coupled with a USNE which I'm not sure is even necessary) but another
place states that If TGSI had a UCMP instruction or similar, this extra
instruction would
FWIW, I think UCMP is a misleading name. Whatever the name will be, it
should be prefixed with I or U, because it's not a floating-point
opcode. How about UCND? :D
Marek
On Thu, Apr 4, 2013 at 6:23 PM, Jose Fonseca jfons...@vmware.com wrote:
There might be some value in renaming UCMP to be
Well if the condition is just any bit set then it doesn't matter if
the input is a float or int or whatever (of course, for floats, that
definition is different than != zero, as it doesn't hold for negative zero).
That would be the same as for instance the bitwise instructions which
also don't
I see. Fair point.
Marek
On Thu, Apr 4, 2013 at 7:32 PM, Roland Scheidegger srol...@vmware.comwrote:
Well if the condition is just any bit set then it doesn't matter if
the input is a float or int or whatever (of course, for floats, that
definition is different than != zero, as it doesn't
It's part of SM4 (http://goo.gl/4IpeK). It's also fairly
painful to emulate without branching. Most hardware
supports it natively and even llvm has a 'select' opcode
which can handle it without too much hassle.
Signed-off-by: Zack Rusin za...@vmware.com
---
15 matches
Mail list logo
