i965: Add brw_reg constructors taking a dynamically determined vector width.

The MRF variant is going to be used extensively by the atomic counter
intrinsics to assemble untyped atomic and surface read messages
easily.

Reviewed-by: Paul Berry <stereotype441@gmail.com>

diff --git a/src/mesa/drivers/dri/i965/brw_reg.h b/src/mesa/drivers/dri/i965/brw_reg.h
index 3ee3543d4e428b33ef1c1f68519b2f010fdfb264..e9cf892f2ee5cf1c6057acee8348d53be29b327b 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_reg.h
+++ b/src/mesa/drivers/dri/i965/brw_reg.h
@@ -282,6 +282,24 @@ brw_vec1_reg(unsigned file, unsigned nr, unsigned subnr)
                   WRITEMASK_X);
 }
 
+static inline struct brw_reg
+brw_vecn_reg(unsigned width, unsigned file, unsigned nr, unsigned subnr)
+{
+   switch (width) {
+   case 1:
+      return brw_vec1_reg(file, nr, subnr);
+   case 2:
+      return brw_vec2_reg(file, nr, subnr);
+   case 4:
+      return brw_vec4_reg(file, nr, subnr);
+   case 8:
+      return brw_vec8_reg(file, nr, subnr);
+   case 16:
+      return brw_vec16_reg(file, nr, subnr);
+   default:
+      assert(!"Invalid register width");
+   }
+}
 
 static inline struct brw_reg
 retype(struct brw_reg reg, unsigned type)
@@ -570,6 +588,12 @@ brw_message_reg(unsigned nr)
    return brw_vec8_reg(BRW_MESSAGE_REGISTER_FILE, nr, 0);
 }
 
+static inline struct brw_reg
+brw_uvec_mrf(unsigned width, unsigned nr, unsigned subnr)
+{
+   return retype(brw_vecn_reg(width, BRW_MESSAGE_REGISTER_FILE, nr, subnr),
+                 BRW_REGISTER_TYPE_UD);
+}
 
 /* This is almost always called with a numeric constant argument, so
  * make things easy to evaluate at compile time: