Mesa (master): nir: When nir_lower_vars_to_explicit_types is run on temps, update scratch_size

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Module: Mesa
Branch: master
Commit: 99aaf0ec181efc5830deaeb7ec3331642125bc38
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=99aaf0ec181efc5830deaeb7ec3331642125bc38

Author: Jesse Natalie <jenatali at microsoft.com>
Date:   Tue May 26 12:20:20 2020 -0700

nir: When nir_lower_vars_to_explicit_types is run on temps, update scratch_size

To allow interop with other scratch ops, append any remaining temp vars
to the end of any already-allocated scratch space.

Reviewed-by: Jason Ekstrand <jason at jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5889>

---

 src/compiler/nir/nir_lower_io.c | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/src/compiler/nir/nir_lower_io.c b/src/compiler/nir/nir_lower_io.c
index 70474f18852..be18f79cdc0 100644
--- a/src/compiler/nir/nir_lower_io.c
+++ b/src/compiler/nir/nir_lower_io.c
@@ -1431,7 +1431,18 @@ lower_vars_to_explicit(nir_shader *shader,
                        glsl_type_size_align_func type_info)
 {
    bool progress = false;
-   unsigned offset = 0;
+   unsigned offset;
+   switch (mode) {
+   case nir_var_function_temp:
+   case nir_var_shader_temp:
+      offset = shader->scratch_size;
+      break;
+   case nir_var_mem_shared:
+      offset = 0;
+      break;
+   default:
+      unreachable("Unsupported mode");
+   }
    nir_foreach_variable(var, vars) {
       unsigned size, align;
       const struct glsl_type *explicit_type =
@@ -1446,9 +1457,17 @@ lower_vars_to_explicit(nir_shader *shader,
       offset = var->data.driver_location + size;
    }
 
-   if (mode == nir_var_mem_shared) {
+   switch (mode) {
+   case nir_var_shader_temp:
+   case nir_var_function_temp:
+      shader->scratch_size = offset;
+      break;
+   case nir_var_mem_shared:
       shader->info.cs.shared_size = offset;
       shader->num_shared = offset;
+      break;
+   default:
+      unreachable("Unsupported mode");
    }
 
    return progress;