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-rw-r--r--src/intel/compiler/brw_fs.cpp18
1 files changed, 18 insertions, 0 deletions
diff --git a/src/intel/compiler/brw_fs.cpp b/src/intel/compiler/brw_fs.cpp
index 337dde63848..86cd5b96986 100644
--- a/src/intel/compiler/brw_fs.cpp
+++ b/src/intel/compiler/brw_fs.cpp
@@ -464,6 +464,24 @@ fs_inst::can_do_source_mods(const struct gen_device_info *devinfo) const
if (is_send_from_grf())
return false;
+ /* From GEN:BUG:1604601757:
+ *
+ * "When multiplying a DW and any lower precision integer, source modifier
+ * is not supported."
+ */
+ if (devinfo->gen >= 12 && (opcode == BRW_OPCODE_MUL ||
+ opcode == BRW_OPCODE_MAD)) {
+ const brw_reg_type exec_type = get_exec_type(this);
+ const unsigned min_type_sz = opcode == BRW_OPCODE_MAD ?
+ MIN2(type_sz(src[1].type), type_sz(src[2].type)) :
+ MIN2(type_sz(src[0].type), type_sz(src[1].type));
+
+ if (brw_reg_type_is_integer(exec_type) &&
+ type_sz(exec_type) >= 4 &&
+ type_sz(exec_type) != min_type_sz)
+ return false;
+ }
+
if (!backend_instruction::can_do_source_mods())
return false;