i965/vec4: don't constant propagate 64-bit immediates

v2: Also check if the instruction source target is 64-bit. (Samuel)

Signed-off-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_copy_propagation.cpp b/src/mesa/drivers/dri/i965/brw_vec4_copy_propagation.cpp
index 739f33e..55413ab 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_copy_propagation.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_copy_propagation.cpp
@@ -151,6 +151,13 @@
    if (value.file != IMM)
       return false;
 
+   /* 64-bit types can't be used except for one-source instructions, which
+    * higher levels should have constant folded away, so there's no point in
+    * propagating immediates here.
+    */
+   if (type_sz(value.type) == 8 || type_sz(inst->src[arg].type) == 8)
+      return false;
+
    if (value.type == BRW_REGISTER_TYPE_VF) {
       /* The result of bit-casting the component values of a vector float
        * cannot in general be represented as an immediate.