nir: Add a fdot instruction that replicates the result to a vec4

Fortunately, nir_constant_expr already auto-splats if "dst" never shows up
in the constant expression field so we don't need to do anything there.

Reviewed-by: Connor Abbott <[email protected]>
Reviewed-by: Eduardo Lima Mitev <[email protected]>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/glsl/nir/nir.h b/src/glsl/nir/nir.h
index 3f693b17fb1..4e4543ad5ec 100644
--- a/src/glsl/nir/nir.h
+++ b/src/glsl/nir/nir.h
@@ -1434,6 +1434,12 @@ typedef struct nir_shader_compiler_options {
    /* lower {slt,sge,seq,sne} to {flt,fge,feq,fne} + b2f: */
    bool lower_scmp;
 
+   /* Does the native fdot instruction replicate its result for four
+    * components?  If so, then opt_algebraic_late will turn all fdotN
+    * instructions into fdot_replicatedN instructions.
+    */
+   bool fdot_replicates;
+
    /**
     * Does the driver support real 32-bit integers?  (Otherwise, integers
     * are simulated by floats.)