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i965/skl: Break down SIMD16 3-source instructions when required.

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Several steppings of Skylake fail when using SIMD16 with 3-source
instructions (such as MAD).

This implements WaDisableSIMD16On3SrcInstr and fixes ~190 Piglit
tests.

Based on a patch by Neil Roberts.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Neil Roberts <neil@linux.intel.com>
This commit is contained in:
Kenneth Graunke 2015-03-04 12:53:45 -08:00 • committed by Neil Roberts
parent bc4b18d297
commit 706b916960
1 changed files with 6 additions and 0 deletions
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6
src/mesa/drivers/dri/i965/brw_fs_generator.cpp
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@ -1559,6 +1559,12 @@ fs_generator::enable_debug(const char *shader_name)
static bool
brw_supports_simd16_3src(const struct brw_context *brw)
{
/* WaDisableSIMD16On3SrcInstr: 3-source instructions don't work in SIMD16
* on a few steppings of Skylake.
*/
if (brw->gen == 9)
return brw->revision != 2 && brw->revision != 3 && brw->revision != -1;
return brw->is_haswell || brw->gen >= 8;
}