nir: Add a helper to determine if an intrinsic can be reordered

This is simple now, but we're going to be adding a few more conditions
to this later.

Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
(cherry picked from commit a1c737927c0d96f26ce487930aa9a2ed323814c9)

3 files changed, 13 insertions, 11 deletions

diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h
index 98940b5fb19..88e2f95c8fb 100644
--- a/src/compiler/nir/nir.h
+++ b/src/compiler/nir/nir.h
@@ -1416,6 +1416,16 @@ nir_intrinsic_align(const nir_intrinsic_instr *intrin)
 void nir_rewrite_image_intrinsic(nir_intrinsic_instr *instr,
                                  nir_ssa_def *handle, bool bindless);
 
+/* Determine if an intrinsic can be arbitrarily reordered and eliminated. */
+static inline bool
+nir_intrinsic_can_reorder(nir_intrinsic_instr *instr)
+{
+   const nir_intrinsic_info *info =
+      &nir_intrinsic_infos[instr->intrinsic];
+   return (info->flags & NIR_INTRINSIC_CAN_ELIMINATE) &&
+          (info->flags & NIR_INTRINSIC_CAN_REORDER);
+}
+
 /**
  * \group texture information
  *
diff --git a/src/compiler/nir/nir_instr_set.c b/src/compiler/nir/nir_instr_set.c
index 2dc0ef6fec9..2e5e47f5eef 100644
--- a/src/compiler/nir/nir_instr_set.c
+++ b/src/compiler/nir/nir_instr_set.c
@@ -749,12 +749,8 @@ instr_can_rewrite(nir_instr *instr)
    case nir_instr_type_load_const:
    case nir_instr_type_phi:
       return true;
-   case nir_instr_type_intrinsic: {
-      const nir_intrinsic_info *info =
-         &nir_intrinsic_infos[nir_instr_as_intrinsic(instr)->intrinsic];
-      return (info->flags & NIR_INTRINSIC_CAN_ELIMINATE) &&
-             (info->flags & NIR_INTRINSIC_CAN_REORDER);
-   }
+   case nir_instr_type_intrinsic:
+      return nir_intrinsic_can_reorder(nir_instr_as_intrinsic(instr));
    case nir_instr_type_call:
    case nir_instr_type_jump:
    case nir_instr_type_ssa_undef:
diff --git a/src/compiler/nir/nir_opt_gcm.c b/src/compiler/nir/nir_opt_gcm.c
index e7d3f8ec424..aeae2ad6401 100644
--- a/src/compiler/nir/nir_opt_gcm.c
+++ b/src/compiler/nir/nir_opt_gcm.c
@@ -152,11 +152,7 @@ gcm_pin_instructions_block(nir_block *block, struct gcm_state *state)
          break;
 
       case nir_instr_type_intrinsic: {
-         const nir_intrinsic_info *info =
-            &nir_intrinsic_infos[nir_instr_as_intrinsic(instr)->intrinsic];
-
-         if ((info->flags & NIR_INTRINSIC_CAN_ELIMINATE) &&
-             (info->flags & NIR_INTRINSIC_CAN_REORDER)) {
+         if (nir_intrinsic_can_reorder(nir_instr_as_intrinsic(instr))) {
             instr->pass_flags = 0;
          } else {
             instr->pass_flags = GCM_INSTR_PINNED;