+static void emit_bfi(const struct lp_build_tgsi_action * action,
+ struct lp_build_tgsi_context * bld_base,
+ struct lp_build_emit_data * emit_data)
+{
+ struct gallivm_state *gallivm = bld_base->base.gallivm;
+ LLVMBuilderRef builder = gallivm->builder;
+ LLVMValueRef bfi_args[3];
+
+ // Calculate the bitmask: (((1 << src3) - 1) << src2
+ bfi_args[0] = LLVMBuildShl(builder,
+ LLVMBuildSub(builder,
+ LLVMBuildShl(builder,
+ bld_base->int_bld.one,
+ emit_data->args[3], ""),
+ bld_base->int_bld.one, ""),
+ emit_data->args[2], "");
+
+ bfi_args[1] = LLVMBuildShl(builder, emit_data->args[1],
+ emit_data->args[2], "");
+
+ bfi_args[2] = emit_data->args[0];
+
+ /* Calculate:
+ * (arg0 & arg1) | (~arg0 & arg2) = arg2 ^ (arg0 & (arg1 ^ arg2)
+ * Use the right-hand side, which the LLVM backend can convert to V_BFI.
+ */
+ emit_data->output[emit_data->chan] =
+ LLVMBuildXor(builder, bfi_args[2],
+ LLVMBuildAnd(builder, bfi_args[0],
+ LLVMBuildXor(builder, bfi_args[1], bfi_args[2],
+ ""), ""), "");
+}
+