[Mesa-dev] [PATCH] R600/SI: Add patterns for V_MAD(_LEGACY) instructions.

Tom Stellard tom at stellard.net
Tue Jan 22 07:10:16 PST 2013

On Tue, Jan 22, 2013 at 04:06:05PM +0100, Michel Dänzer wrote:
> On Mon, 2013-01-21 at 23:03 +0100, Tom Stellard wrote: 
> > 
> > I don't think we emit the int_AMDGPU_mul intrinsic anymore, but it probably
> > doesn't hurt to keep it around until we sort out all of the legacy vs non-legacy
> > instruction issues.
> Right. BTW, emitting int_AMDGPU_mad for TGSI_OPCODE_MAD doesn't fix the
> glxgears problem I reported on IRC with current master (in contrast to
> 0ad1fefd6951aa47ab58a41dc9ee73083cbcf85c, where that problem was
> introduced). Looks like the intrinsic ends up generating cmp/select
> pairs instead of V_MAD in some cases now, which breaks somehow.
> In the meantime, I've come to realize that this patch breaks a bunch of
> piglit tests in the glsl-1.[12]0/execution/variable-indexing groups (I
> previously thought those tests were broken by the array uniform related
> changes). I'm attaching a diff of the generated code. Not sure if this
> is some kind of bad interaction between this change and the control flow
> code, or another instance of tests which passed accidentally.

Do these tests use indirect addressing?  If so, they were probably passing
by chance.


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