From the BDW PRM, Workarounds chapter:
"DF->f format conversion for Align16 has wrong emask calculation when
source is immediate."
So detect the case and move the immediate source to a VGRF before we attempt
the conversion.
Notice that Broadwell and later are strictly scalar at the moment though, so
this is not really necessary.
---
src/mesa/drivers/dri/i965/brw_vec4_nir.cpp | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp
b/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp
index 94d0161..0170d21 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp
@@ -1077,6 +1077,17 @@ void
vec4_visitor::emit_double_to_single(dst_reg dst, src_reg src, bool saturate,
brw_reg_type single_type)
{
+ /* BDW PRM vol 15 - workarounds:
+ * DF->f format conversion for Align16 has wrong emask calculation when
+ * source is immediate.
+ */
+ if (devinfo->gen == 8 && single_type == BRW_REGISTER_TYPE_F &&
+ src.file == BRW_IMMEDIATE_VALUE) {
+ dst_reg fixed_src = dst_reg(this, glsl_type::dvec4_type);
+ emit(MOV(fixed_src, src));
+ src = src_reg(fixed_src);
+ }
+
dst_reg temp = dst_reg(this, glsl_type::dvec4_type);
emit(MOV(temp, src));
--
2.7.4
_______________________________________________
mesa-dev mailing list
mesa-dev@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/mesa-dev
