diff --git a/backend/spirv/emit_spirv_context_get_set.cpp b/backend/spirv/emit_spirv_context_get_set.cpp
index c29643f33..52369381a 100644
--- a/backend/spirv/emit_spirv_context_get_set.cpp
+++ b/backend/spirv/emit_spirv_context_get_set.cpp
@@ -340,9 +340,7 @@ Id EmitGetAttribute(EmitContext& ctx, IR::Attribute attr, Id vertex) {
         if (ctx.profile.support_vertex_instance_id) {
             return ctx.OpBitcast(ctx.F32[1], ctx.OpLoad(ctx.U32[1], ctx.vertex_id));
         } else {
-            const Id index{ctx.OpLoad(ctx.U32[1], ctx.vertex_index)};
-            const Id base{ctx.OpLoad(ctx.U32[1], ctx.base_vertex)};
-            return ctx.OpBitcast(ctx.F32[1], ctx.OpISub(ctx.U32[1], index, base));
+            return ctx.OpLoad(ctx.U32[1], ctx.vertex_index);
         }
     case IR::Attribute::BaseInstance:
         return ctx.OpBitcast(ctx.F32[1], ctx.OpLoad(ctx.U32[1], ctx.base_instance));
@@ -387,9 +385,7 @@ Id EmitGetAttributeU32(EmitContext& ctx, IR::Attribute attr, Id) {
         if (ctx.profile.support_vertex_instance_id) {
             return ctx.OpLoad(ctx.U32[1], ctx.vertex_id);
         } else {
-            const Id index{ctx.OpLoad(ctx.U32[1], ctx.vertex_index)};
-            const Id base{ctx.OpLoad(ctx.U32[1], ctx.base_vertex)};
-            return ctx.OpISub(ctx.U32[1], index, base);
+            return ctx.OpBitcast(ctx.F32[1], ctx.OpLoad(ctx.U32[1], ctx.vertex_index));
         }
     case IR::Attribute::BaseInstance:
         return ctx.OpLoad(ctx.U32[1], ctx.base_instance);
diff --git a/frontend/maxwell/translate/impl/texture_mipmap_level.cpp b/frontend/maxwell/translate/impl/texture_mipmap_level.cpp
index 58fa3ae03..3003ff72d 100644
--- a/frontend/maxwell/translate/impl/texture_mipmap_level.cpp
+++ b/frontend/maxwell/translate/impl/texture_mipmap_level.cpp
@@ -102,12 +102,7 @@ void Impl(TranslatorVisitor& v, u64 insn, bool is_bindless) {
         }
         IR::F32 value{v.ir.CompositeExtract(sample, element)};
         if (element < 2) {
-            IR::U32 casted_value;
-            if (element == 0) {
-                casted_value = v.ir.ConvertFToU(32, value);
-            } else {
-                casted_value = v.ir.ConvertFToS(16, value);
-            }
+            IR::U32 casted_value = v.ir.ConvertFToU(32, value);
             v.X(dest_reg, v.ir.ShiftLeftLogical(casted_value, v.ir.Imm32(8)));
         } else {
             v.F(dest_reg, value);