From: Kenneth Graunke <[email protected]>
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.
---
src/mesa/drivers/dri/i965/brw_shader.cpp | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/src/mesa/drivers/dri/i965/brw_shader.cpp
b/src/mesa/drivers/dri/i965/brw_shader.cpp
index fa1394a..404a13f 100644
--- a/src/mesa/drivers/dri/i965/brw_shader.cpp
+++ b/src/mesa/drivers/dri/i965/brw_shader.cpp
@@ -396,6 +396,12 @@ brw_texture_offset(struct gl_context *ctx, int *offsets,
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;
}
--
1.9.3
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