diff --git a/dlls/wined3d/arb_program_shader.c b/dlls/wined3d/arb_program_shader.c
index 7fc97b5d999..f9906b24bfe 100644
--- a/dlls/wined3d/arb_program_shader.c
+++ b/dlls/wined3d/arb_program_shader.c
@@ -5142,6 +5142,7 @@ static const SHADER_HANDLER shader_arb_instruction_handler_table[WINED3DSIH_TABL
     /* WINED3DSIH_IMM_ATOMIC_CMP_EXCH              */ NULL,
     /* WINED3DSIH_IMM_ATOMIC_CONSUME               */ NULL,
     /* WINED3DSIH_IMM_ATOMIC_EXCH                  */ NULL,
+    /* WINED3DSIH_IMM_ATOMIC_IADD                  */ NULL,
     /* WINED3DSIH_IMM_ATOMIC_OR                    */ NULL,
     /* WINED3DSIH_IMM_ATOMIC_UMAX                  */ NULL,
     /* WINED3DSIH_IMM_ATOMIC_UMIN                  */ NULL,
diff --git a/dlls/wined3d/glsl_shader.c b/dlls/wined3d/glsl_shader.c
index 2df308e7b11..e47d18b6a04 100644
--- a/dlls/wined3d/glsl_shader.c
+++ b/dlls/wined3d/glsl_shader.c
@@ -9026,6 +9026,7 @@ static const SHADER_HANDLER shader_glsl_instruction_handler_table[WINED3DSIH_TAB
     /* WINED3DSIH_IMM_ATOMIC_CMP_EXCH              */ NULL,
     /* WINED3DSIH_IMM_ATOMIC_CONSUME               */ NULL,
     /* WINED3DSIH_IMM_ATOMIC_EXCH                  */ NULL,
+    /* WINED3DSIH_IMM_ATOMIC_IADD                  */ NULL,
     /* WINED3DSIH_IMM_ATOMIC_OR                    */ NULL,
     /* WINED3DSIH_IMM_ATOMIC_UMAX                  */ NULL,
     /* WINED3DSIH_IMM_ATOMIC_UMIN                  */ NULL,
diff --git a/dlls/wined3d/shader.c b/dlls/wined3d/shader.c
index 00ed4527f6d..490c985acf1 100644
--- a/dlls/wined3d/shader.c
+++ b/dlls/wined3d/shader.c
@@ -162,6 +162,7 @@ static const char * const shader_opcode_names[] =
     /* WINED3DSIH_IMM_ATOMIC_CMP_EXCH              */ "imm_atomic_cmp_exch",
     /* WINED3DSIH_IMM_ATOMIC_CONSUME               */ "imm_atomic_consume",
     /* WINED3DSIH_IMM_ATOMIC_EXCH                  */ "imm_atomic_exch",
+    /* WINED3DSIH_IMM_ATOMIC_IADD                  */ "imm_atomic_iadd",
     /* WINED3DSIH_IMM_ATOMIC_OR                    */ "imm_atomic_or",
     /* WINED3DSIH_IMM_ATOMIC_UMAX                  */ "imm_atomic_umax",
     /* WINED3DSIH_IMM_ATOMIC_UMIN                  */ "imm_atomic_umin",
diff --git a/dlls/wined3d/shader_sm4.c b/dlls/wined3d/shader_sm4.c
index 9bd9b629ab7..991fad7f44a 100644
--- a/dlls/wined3d/shader_sm4.c
+++ b/dlls/wined3d/shader_sm4.c
@@ -277,6 +277,7 @@ enum wined3d_sm4_opcode
     WINED3D_SM5_OP_ATOMIC_UMIN                      = 0xb1,
     WINED3D_SM5_OP_IMM_ATOMIC_ALLOC                 = 0xb2,
     WINED3D_SM5_OP_IMM_ATOMIC_CONSUME               = 0xb3,
+    WINED3D_SM5_OP_IMM_ATOMIC_IADD                  = 0xb4,
     WINED3D_SM5_OP_IMM_ATOMIC_AND                   = 0xb5,
     WINED3D_SM5_OP_IMM_ATOMIC_OR                    = 0xb6,
     WINED3D_SM5_OP_IMM_ATOMIC_XOR                   = 0xb7,
@@ -1000,6 +1001,7 @@ static const struct wined3d_sm4_opcode_info opcode_table[] =
     {WINED3D_SM5_OP_ATOMIC_UMIN,                      WINED3DSIH_ATOMIC_UMIN,                      "U",    "iu"},
     {WINED3D_SM5_OP_IMM_ATOMIC_ALLOC,                 WINED3DSIH_IMM_ATOMIC_ALLOC,                 "u",    "U"},
     {WINED3D_SM5_OP_IMM_ATOMIC_CONSUME,               WINED3DSIH_IMM_ATOMIC_CONSUME,               "u",    "U"},
+    {WINED3D_SM5_OP_IMM_ATOMIC_IADD,                  WINED3DSIH_IMM_ATOMIC_IADD,                  "uU",   "ii"},
     {WINED3D_SM5_OP_IMM_ATOMIC_AND,                   WINED3DSIH_IMM_ATOMIC_AND,                   "uU",   "iu"},
     {WINED3D_SM5_OP_IMM_ATOMIC_OR,                    WINED3DSIH_IMM_ATOMIC_OR,                    "uU",   "iu"},
     {WINED3D_SM5_OP_IMM_ATOMIC_XOR,                   WINED3DSIH_IMM_ATOMIC_XOR,                   "uU",   "iu"},
diff --git a/dlls/wined3d/wined3d_private.h b/dlls/wined3d/wined3d_private.h
index 7209ce8d170..9b16e14aad6 100644
--- a/dlls/wined3d/wined3d_private.h
+++ b/dlls/wined3d/wined3d_private.h
@@ -692,6 +692,7 @@ enum WINED3D_SHADER_INSTRUCTION_HANDLER
     WINED3DSIH_IMM_ATOMIC_CMP_EXCH,
     WINED3DSIH_IMM_ATOMIC_CONSUME,
     WINED3DSIH_IMM_ATOMIC_EXCH,
+    WINED3DSIH_IMM_ATOMIC_IADD,
     WINED3DSIH_IMM_ATOMIC_OR,
     WINED3DSIH_IMM_ATOMIC_UMAX,
     WINED3DSIH_IMM_ATOMIC_UMIN,