pan/bi: Add imm_f16 helper

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9105>

src/panfrost/bifrost/compiler.h

@@ -32,6 +32,7 @@
 #include "compiler/nir/nir.h"
 #include "panfrost/util/pan_ir.h"
 #include "util/u_math.h"
+#include "util/half_float.h"
 
 /* Swizzles across bytes in a 32-bit word. Expresses swz in the XML directly.
  * To express widen, use the correpsonding replicated form, i.e. H01 = identity
@@ -225,6 +226,12 @@ bi_imm_u16(uint16_t imm)
         return bi_half(bi_imm_u32(imm), false);
 }
 
+static inline bi_index
+bi_imm_f16(float imm)
+{
+        return bi_imm_u16(_mesa_float_to_half(imm));
+}
+
 static inline bool
 bi_is_null(bi_index idx)
 {