intel/compiler: Don't left-shift by >= the number of bits of the type

[mesa.git] / src / intel / compiler / brw_fs.cpp

diff --git a/src/intel/compiler/brw_fs.cpp b/src/intel/compiler/brw_fs.cpp
index 46f5fca9a62ad8676dd65e462ee378121d4a2481..538745880c6fd911d8749c295dd7cf6a6996cd6f 100644 (file)
--- a/src/intel/compiler/brw_fs.cpp
+++ b/src/intel/compiler/brw_fs.cpp
@@ -8241,6 +8241,19 @@ brw_compile_fs(const struct brw_compiler *compiler, void *log_data,
    if (devinfo->gen < 6)
       brw_setup_vue_interpolation(vue_map, shader, prog_data);
 
+   /* From the SKL PRM, Volume 7, "Alpha Coverage":
+    *  "If Pixel Shader outputs oMask, AlphaToCoverage is disabled in
+    *   hardware, regardless of the state setting for this feature."
+    */
+   if (devinfo->gen > 6 && key->alpha_to_coverage) {
+      /* Run constant fold optimization in order to get the correct source
+       * offset to determine render target 0 store instruction in
+       * emit_alpha_to_coverage pass.
+       */
+      NIR_PASS_V(shader, nir_opt_constant_folding);
+      NIR_PASS_V(shader, brw_nir_lower_alpha_to_coverage);
+   }
+
    if (!key->multisample_fbo)
       NIR_PASS_V(shader, demote_sample_qualifiers);
    NIR_PASS_V(shader, move_interpolation_to_top);