[Mesa-dev] [PATCH v2 060/103] i965/vec4: Skip swizzle to subnr in 3src instructions with DF operands

[Iago Toral Quiroga]

We make scalar sources in 3src instructions use subnr instead of
swizzles because they don't really use swizzles.

With doubles it is more complicated because we use vstride=0 in
more scenarios in which they don't produce scalar regions. Also
RepCtrl=1 is not allowed with 64-bit operands, so we should avoid
this.
---
 src/mesa/drivers/dri/i965/brw_vec4.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/mesa/drivers/dri/i965/brw_vec4.cpp b/src/mesa/drivers/dri/i965/brw_vec4.cpp
index 45d49e9..190581e 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4.cpp
@@ -1961,9 +1961,12 @@ vec4_visitor::convert_to_hw_regs()
       if (inst->is_3src(devinfo)) {
          /* 3-src instructions with scalar sources support arbitrary subnr,
           * but don't actually use swizzles.  Convert swizzle into subnr.
+          * Skip this for double-precision instructions: RepCtrl=1 is not
+          * allowed for them and need special handling.
           */
          for (int i = 0; i < 3; i++) {
-            if (inst->src[i].vstride == BRW_VERTICAL_STRIDE_0) {
+            if (inst->src[i].vstride == BRW_VERTICAL_STRIDE_0 &&
+                type_sz(inst->src[i].type) < 8) {
                assert(brw_is_single_value_swizzle(inst->src[i].swizzle));
                inst->src[i].subnr += 4 * BRW_GET_SWZ(inst->src[i].swizzle, 0);
             }
-- 
2.7.4