Mesa (master): Revert "i965: use nir_lower_indirect_derefs() for GLSL"

[Jason Ekstrand]

Module: Mesa
Branch: master
Commit: 0291bf4db2affbfb6a7daeb562c0cf56f6a85829
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=0291bf4db2affbfb6a7daeb562c0cf56f6a85829

Author: Jason Ekstrand <jason.ekstrand at intel.com>
Date:   Mon Dec  5 15:20:52 2016 -0800

Revert "i965: use nir_lower_indirect_derefs() for GLSL"

This reverts commit 9404439a754e5640ccd98df40fa694835c0d8759.  I didn't
intend to push it and it breaks clip and cull distance.

---

 src/intel/vulkan/anv_pipeline.c        | 10 ++++++++++
 src/mesa/drivers/dri/i965/brw_link.cpp | 13 +++++++++++++
 src/mesa/drivers/dri/i965/brw_nir.c    | 10 ----------
 3 files changed, 23 insertions(+), 10 deletions(-)

diff --git a/src/intel/vulkan/anv_pipeline.c b/src/intel/vulkan/anv_pipeline.c
index 6b0a3c9..9b65e35 100644
--- a/src/intel/vulkan/anv_pipeline.c
+++ b/src/intel/vulkan/anv_pipeline.c
@@ -177,6 +177,16 @@ anv_shader_compile_to_nir(struct anv_device *device,
 
    nir_shader_gather_info(nir, entry_point->impl);
 
+   nir_variable_mode indirect_mask = 0;
+   if (compiler->glsl_compiler_options[stage].EmitNoIndirectInput)
+      indirect_mask |= nir_var_shader_in;
+   if (compiler->glsl_compiler_options[stage].EmitNoIndirectOutput)
+      indirect_mask |= nir_var_shader_out;
+   if (compiler->glsl_compiler_options[stage].EmitNoIndirectTemp)
+      indirect_mask |= nir_var_local;
+
+   nir_lower_indirect_derefs(nir, indirect_mask);
+
    return nir;
 }
 
diff --git a/src/mesa/drivers/dri/i965/brw_link.cpp b/src/mesa/drivers/dri/i965/brw_link.cpp
index 19e691e..3f6041b 100644
--- a/src/mesa/drivers/dri/i965/brw_link.cpp
+++ b/src/mesa/drivers/dri/i965/brw_link.cpp
@@ -137,6 +137,19 @@ process_glsl_ir(struct brw_context *brw,
 
    do_copy_propagation(shader->ir);
 
+   bool lowered_variable_indexing =
+      lower_variable_index_to_cond_assign(shader->Stage, shader->ir,
+                                          options->EmitNoIndirectInput,
+                                          options->EmitNoIndirectOutput,
+                                          options->EmitNoIndirectTemp,
+                                          options->EmitNoIndirectUniform);
+
+   if (unlikely(brw->perf_debug && lowered_variable_indexing)) {
+      perf_debug("Unsupported form of variable indexing in %s; falling "
+                 "back to very inefficient code generation\n",
+                 _mesa_shader_stage_to_abbrev(shader->Stage));
+   }
+
    bool progress;
    do {
       progress = false;
diff --git a/src/mesa/drivers/dri/i965/brw_nir.c b/src/mesa/drivers/dri/i965/brw_nir.c
index 8768cee..763e3ec 100644
--- a/src/mesa/drivers/dri/i965/brw_nir.c
+++ b/src/mesa/drivers/dri/i965/brw_nir.c
@@ -485,16 +485,6 @@ brw_preprocess_nir(const struct brw_compiler *compiler, nir_shader *nir)
    /* Lower a bunch of stuff */
    OPT_V(nir_lower_var_copies);
 
-   nir_variable_mode indirect_mask = 0;
-   if (compiler->glsl_compiler_options[nir->stage].EmitNoIndirectInput)
-      indirect_mask |= nir_var_shader_in;
-   if (compiler->glsl_compiler_options[nir->stage].EmitNoIndirectOutput)
-      indirect_mask |= nir_var_shader_out;
-   if (compiler->glsl_compiler_options[nir->stage].EmitNoIndirectTemp)
-      indirect_mask |= nir_var_local;
-
-   nir_lower_indirect_derefs(nir, indirect_mask);
-
    /* Get rid of split copies */
    nir = nir_optimize(nir, is_scalar);