From 9b37e93e4256ab1610bff5cdacc1e846467fc19d Mon Sep 17 00:00:00 2001
From: Jason Ekstrand <jason.ekstrand@intel.com>
Date: Tue, 22 Jan 2019 11:57:48 -0600
Subject: [PATCH] spirv: Replace vtn_constant_value with vtn_constant_uint

The uint version is less typing, supports different bit sizes, and is
probably a bit more safe because we're actually verifying that the
SPIR-V value is an integer scalar constant.

Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
---
 src/compiler/spirv/spirv_to_nir.c | 16 ++++++----------
 src/compiler/spirv/vtn_private.h  | 18 +++++++++++++++---
 src/compiler/spirv/vtn_subgroup.c |  4 ++--
 3 files changed, 23 insertions(+), 15 deletions(-)

diff --git a/src/compiler/spirv/spirv_to_nir.c b/src/compiler/spirv/spirv_to_nir.c
index 9bfe580..1a26c51 100644
--- a/src/compiler/spirv/spirv_to_nir.c
+++ b/src/compiler/spirv/spirv_to_nir.c
@@ -3358,7 +3358,7 @@ vtn_handle_barrier(struct vtn_builder *b, SpvOp opcode,
       switch (opcode) {
       case SpvOpEmitStreamVertex:
       case SpvOpEndStreamPrimitive: {
-         unsigned stream = vtn_constant_value(b, w[1])->values[0].u32[0];
+         unsigned stream = vtn_constant_uint(b, w[1]);
          nir_intrinsic_set_stream_id(intrin, stream);
          break;
       }
@@ -3372,23 +3372,19 @@ vtn_handle_barrier(struct vtn_builder *b, SpvOp opcode,
    }
 
    case SpvOpMemoryBarrier: {
-      SpvScope scope = vtn_constant_value(b, w[1])->values[0].u32[0];
-      SpvMemorySemanticsMask semantics =
-         vtn_constant_value(b, w[2])->values[0].u32[0];
+      SpvScope scope = vtn_constant_uint(b, w[1]);
+      SpvMemorySemanticsMask semantics = vtn_constant_uint(b, w[2]);
       vtn_emit_memory_barrier(b, scope, semantics);
       return;
    }
 
    case SpvOpControlBarrier: {
-      SpvScope execution_scope =
-         vtn_constant_value(b, w[1])->values[0].u32[0];
+      SpvScope execution_scope = vtn_constant_uint(b, w[1]);
       if (execution_scope == SpvScopeWorkgroup)
          vtn_emit_barrier(b, nir_intrinsic_barrier);
 
-      SpvScope memory_scope =
-         vtn_constant_value(b, w[2])->values[0].u32[0];
-      SpvMemorySemanticsMask memory_semantics =
-         vtn_constant_value(b, w[3])->values[0].u32[0];
+      SpvScope memory_scope = vtn_constant_uint(b, w[2]);
+      SpvMemorySemanticsMask memory_semantics = vtn_constant_uint(b, w[3]);
       vtn_emit_memory_barrier(b, memory_scope, memory_semantics);
       break;
    }
diff --git a/src/compiler/spirv/vtn_private.h b/src/compiler/spirv/vtn_private.h
index 748a2a2..07e3311 100644
--- a/src/compiler/spirv/vtn_private.h
+++ b/src/compiler/spirv/vtn_private.h
@@ -673,10 +673,22 @@ bool
 vtn_set_instruction_result_type(struct vtn_builder *b, SpvOp opcode,
                                 const uint32_t *w, unsigned count);
 
-static inline nir_constant *
-vtn_constant_value(struct vtn_builder *b, uint32_t value_id)
+static inline uint64_t
+vtn_constant_uint(struct vtn_builder *b, uint32_t value_id)
 {
-   return vtn_value(b, value_id, vtn_value_type_constant)->constant;
+   struct vtn_value *val = vtn_value(b, value_id, vtn_value_type_constant);
+
+   vtn_fail_if(val->type->base_type != vtn_base_type_scalar ||
+               !glsl_type_is_integer(val->type->type),
+               "Expected id %u to be an integer constant", value_id);
+
+   switch (glsl_get_bit_size(val->type->type)) {
+   case 8:  return val->constant->values[0].u8[0];
+   case 16: return val->constant->values[0].u16[0];
+   case 32: return val->constant->values[0].u32[0];
+   case 64: return val->constant->values[0].u64[0];
+   default: unreachable("Invalid bit size");
+   }
 }
 
 struct vtn_ssa_value *vtn_ssa_value(struct vtn_builder *b, uint32_t value_id);
diff --git a/src/compiler/spirv/vtn_subgroup.c b/src/compiler/spirv/vtn_subgroup.c
index 4191305..1b066f9 100644
--- a/src/compiler/spirv/vtn_subgroup.c
+++ b/src/compiler/spirv/vtn_subgroup.c
@@ -269,7 +269,7 @@ vtn_handle_subgroup(struct vtn_builder *b, SpvOp opcode,
       break;
 
    case SpvOpGroupNonUniformQuadSwap: {
-      unsigned direction = vtn_constant_value(b, w[5])->values[0].u32[0];
+      unsigned direction = vtn_constant_uint(b, w[5]);
       nir_intrinsic_op op;
       switch (direction) {
       case 0:
@@ -368,7 +368,7 @@ vtn_handle_subgroup(struct vtn_builder *b, SpvOp opcode,
       case SpvGroupOperationClusteredReduce:
          op = nir_intrinsic_reduce;
          assert(count == 7);
-         cluster_size = vtn_constant_value(b, w[6])->values[0].u32[0];
+         cluster_size = vtn_constant_uint(b, w[6]);
          break;
       default:
          unreachable("Invalid group operation");
-- 
2.7.4