diff --git a/src/amd/compiler/aco_ir.cpp b/src/amd/compiler/aco_ir.cpp
index 9eb62b2b097..3e9936c23e9 100644
--- a/src/amd/compiler/aco_ir.cpp
+++ b/src/amd/compiler/aco_ir.cpp
@@ -1358,7 +1358,8 @@ get_op_fixed_to_def(Instruction* instr)
        instr->opcode == aco_opcode::v_fmac_legacy_f32 ||
        instr->opcode == aco_opcode::v_pk_fmac_f16 || instr->opcode == aco_opcode::v_writelane_b32 ||
        instr->opcode == aco_opcode::v_writelane_b32_e64 ||
-       instr->opcode == aco_opcode::v_dot4c_i32_i8) {
+       instr->opcode == aco_opcode::v_dot4c_i32_i8 || instr->opcode == aco_opcode::s_fmac_f32 ||
+       instr->opcode == aco_opcode::s_fmac_f16) {
       return 2;
    } else if (instr->opcode == aco_opcode::s_addk_i32 || instr->opcode == aco_opcode::s_mulk_i32 ||
               instr->opcode == aco_opcode::s_cmovk_i32) {
diff --git a/src/amd/compiler/aco_optimizer.cpp b/src/amd/compiler/aco_optimizer.cpp
index 6df08f33943..947e0b5aaa2 100644
--- a/src/amd/compiler/aco_optimizer.cpp
+++ b/src/amd/compiler/aco_optimizer.cpp
@@ -617,6 +617,8 @@ alu_can_accept_constant(const aco_ptr<Instruction>& instr, unsigned operand)
       return false;
 
    switch (instr->opcode) {
+   case aco_opcode::s_fmac_f16:
+   case aco_opcode::s_fmac_f32:
    case aco_opcode::v_mac_f32:
    case aco_opcode::v_writelane_b32:
    case aco_opcode::v_writelane_b32_e64: