Mesa (master): spirv: Split the vtn_emit_scoped_memory_barrier() logic

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Module: Mesa
Branch: master
Commit: 94438a64bf7e5cd37c56e954156d59e404d76f55
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=94438a64bf7e5cd37c56e954156d59e404d76f55

Author: Boris Brezillon <boris.brezillon at collabora.com>
Date:   Thu Apr 23 14:16:43 2020 +0200

spirv: Split the vtn_emit_scoped_memory_barrier() logic

We are about to add support for scoped control+memory barriers. Let's
move the convert from SPIRV to NIR enums logic in helpers so we can
easily re-use them.

Signed-off-by: Boris Brezillon <boris.brezillon at collabora.com>
Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira at intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4900>

---

 src/compiler/spirv/spirv_to_nir.c | 37 +++++++++++++++++++++++++++++++------
 1 file changed, 31 insertions(+), 6 deletions(-)

diff --git a/src/compiler/spirv/spirv_to_nir.c b/src/compiler/spirv/spirv_to_nir.c
index 7bb9489aaeb..fd3674b04e8 100644
--- a/src/compiler/spirv/spirv_to_nir.c
+++ b/src/compiler/spirv/spirv_to_nir.c
@@ -1991,9 +1991,9 @@ vtn_split_barrier_semantics(struct vtn_builder *b,
       *after |= SpvMemorySemanticsMakeAvailableMask | storage_semantics;
 }
 
-static void
-vtn_emit_scoped_memory_barrier(struct vtn_builder *b, SpvScope scope,
-                               SpvMemorySemanticsMask semantics)
+static nir_memory_semantics
+vtn_mem_semantics_to_nir_mem_semantics(struct vtn_builder *b,
+                                       SpvMemorySemanticsMask semantics)
 {
    nir_memory_semantics nir_semantics = 0;
 
@@ -2050,6 +2050,13 @@ vtn_emit_scoped_memory_barrier(struct vtn_builder *b, SpvScope scope,
       nir_semantics |= NIR_MEMORY_MAKE_VISIBLE;
    }
 
+   return nir_semantics;
+}
+
+static nir_variable_mode
+vtn_mem_sematics_to_nir_var_modes(struct vtn_builder *b,
+                                  SpvMemorySemanticsMask semantics)
+{
    /* Vulkan Environment for SPIR-V says "SubgroupMemory, CrossWorkgroupMemory,
     * and AtomicCounterMemory are ignored".
     */
@@ -2075,10 +2082,12 @@ vtn_emit_scoped_memory_barrier(struct vtn_builder *b, SpvScope scope,
       modes |= nir_var_shader_out;
    }
 
-   /* No barrier to add. */
-   if (nir_semantics == 0 || modes == 0)
-      return;
+   return modes;
+}
 
+static nir_scope
+vtn_scope_to_nir_scope(struct vtn_builder *b, SpvScope scope)
+{
    nir_scope nir_scope;
    switch (scope) {
    case SpvScopeDevice:
@@ -2113,6 +2122,22 @@ vtn_emit_scoped_memory_barrier(struct vtn_builder *b, SpvScope scope,
       vtn_fail("Invalid memory scope");
    }
 
+   return nir_scope;
+}
+
+static void
+vtn_emit_scoped_memory_barrier(struct vtn_builder *b, SpvScope scope,
+                               SpvMemorySemanticsMask semantics)
+{
+   nir_variable_mode modes = vtn_mem_sematics_to_nir_var_modes(b, semantics);
+   nir_memory_semantics nir_semantics =
+      vtn_mem_semantics_to_nir_mem_semantics(b, semantics);
+
+   /* No barrier to add. */
+   if (nir_semantics == 0 || modes == 0)
+      return;
+
+   nir_scope nir_scope = vtn_scope_to_nir_scope(b, scope);
    nir_intrinsic_instr *intrin =
       nir_intrinsic_instr_create(b->shader, nir_intrinsic_scoped_memory_barrier);
    nir_intrinsic_set_memory_semantics(intrin, nir_semantics);