diff --git a/gcc/testsuite/gcc.target/riscv/sat_arith.h b/gcc/testsuite/gcc.target/riscv/sat_arith.h
index b4339eb0dff..a899979904b 100644
--- a/gcc/testsuite/gcc.target/riscv/sat_arith.h
+++ b/gcc/testsuite/gcc.target/riscv/sat_arith.h
@@ -238,6 +238,13 @@ sat_u_sub_imm##IMM##_##T##_fmt_3 (T y)  \
   return (T)IMM > y ? (T)IMM - y : 0;   \
 }
 
+#define DEF_SAT_U_SUB_IMM_FMT_4(T, IMM) \
+T __attribute__((noinline))             \
+sat_u_sub_imm##IMM##_##T##_fmt_4 (T x)  \
+{                                       \
+  return x > (T)IMM ? x - (T)IMM : 0;   \
+}
+
 #define RUN_SAT_U_SUB_FMT_1(T, x, y) sat_u_sub_##T##_fmt_1(x, y)
 #define RUN_SAT_U_SUB_FMT_2(T, x, y) sat_u_sub_##T##_fmt_2(x, y)
 #define RUN_SAT_U_SUB_FMT_3(T, x, y) sat_u_sub_##T##_fmt_3(x, y)
@@ -257,6 +264,8 @@ sat_u_sub_imm##IMM##_##T##_fmt_3 (T y)  \
   if (sat_u_sub_imm##IMM##_##T##_fmt_2(x) != expect) __builtin_abort ()
 #define RUN_SAT_U_SUB_IMM_FMT_3(T, IMM, y, expect) \
   if (sat_u_sub_imm##IMM##_##T##_fmt_3(y) != expect) __builtin_abort ()
+#define RUN_SAT_U_SUB_IMM_FMT_4(T, x, IMM, expect) \
+  if (sat_u_sub_imm##IMM##_##T##_fmt_4(x) != expect) __builtin_abort ()
 
 /******************************************************************************/
 /* Saturation Truncate (unsigned and signed)                                  */
diff --git a/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-13.c b/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-13.c
new file mode 100644
index 00000000000..7dcbc3b1a12
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-13.c
@@ -0,0 +1,19 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64gc -mabi=lp64d -O3 -fdump-rtl-expand-details -fno-schedule-insns -fno-schedule-insns2" } */
+/* { dg-final { check-function-bodies "**" "" } } */
+
+#include "sat_arith.h"
+
+/*
+** sat_u_sub_imm11_uint8_t_fmt_4:
+** addi\s+[atx][0-9]+,\s*a0,\s*-11
+** sltiu\s+a0,\s*[atx][0-9]+,\s*11
+** addi\s+a0,\s*a0,\s*-1
+** and\s+a0,\s*a0,\s*[atx][0-9]+
+** andi\s+a0,\s*a0,\s*0xff
+** ret
+*/
+
+DEF_SAT_U_SUB_IMM_FMT_4(uint8_t, 11)
+
+/* { dg-final { scan-rtl-dump-times ".SAT_SUB " 2 "expand" } } */
diff --git a/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-13_1.c b/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-13_1.c
new file mode 100644
index 00000000000..ec902880e82
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-13_1.c
@@ -0,0 +1,19 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64gc -mabi=lp64d -O3 -fdump-rtl-expand-details -fno-schedule-insns -fno-schedule-insns2" } */
+/* { dg-final { check-function-bodies "**" "" } } */
+
+#include "sat_arith.h"
+
+/*
+** sat_u_sub_imm128_uint8_t_fmt_4:
+** addi\s+[atx][0-9]+,\s*a0,\s*-128
+** sltiu\s+a0,\s*[atx][0-9]+,\s*128
+** addi\s+a0,\s*a0,\s*-1
+** and\s+a0,\s*a0,\s*[atx][0-9]+
+** andi\s+a0,\s*a0,\s*0xff
+** ret
+*/
+
+DEF_SAT_U_SUB_IMM_FMT_4(uint8_t, 128)
+
+/* { dg-final { scan-rtl-dump-times ".SAT_SUB " 2 "expand" } } */
diff --git a/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-13_2.c b/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-13_2.c
new file mode 100644
index 00000000000..4fa33a702c1
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-13_2.c
@@ -0,0 +1,19 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64gc -mabi=lp64d -O3 -fdump-rtl-expand-details -fno-schedule-insns -fno-schedule-insns2" } */
+/* { dg-final { check-function-bodies "**" "" } } */
+
+#include "sat_arith.h"
+
+/*
+** sat_u_sub_imm253_uint8_t_fmt_4:
+** addi\s+[atx][0-9]+,\s*a0,\s*-253
+** sltiu\s+a0,\s*[atx][0-9]+,\s*253
+** addi\s+a0,\s*a0,\s*-1
+** and\s+a0,\s*a0,\s*[atx][0-9]+
+** andi\s+a0,\s*a0,\s*0xff
+** ret
+*/
+
+DEF_SAT_U_SUB_IMM_FMT_4(uint8_t, 253)
+
+/* { dg-final { scan-rtl-dump-times ".SAT_SUB " 2 "expand" } } */
diff --git a/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-14.c b/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-14.c
new file mode 100644
index 00000000000..45db6339b78
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-14.c
@@ -0,0 +1,20 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64gc -mabi=lp64d -O3 -fdump-rtl-expand-details -fno-schedule-insns -fno-schedule-insns2" } */
+/* { dg-final { check-function-bodies "**" "" } } */
+
+#include "sat_arith.h"
+
+/*
+** sat_u_sub_imm6_uint16_t_fmt_4:
+** addi\s+[atx][0-9]+,\s*a0,\s*-6
+** sltiu\s+a0,\s*[atx][0-9]+,\s*6
+** addi\s+a0,\s*a0,\s*-1
+** and\s+a0,\s*a0,\s*[atx][0-9]+
+** slli\s+a0,\s*a0,\s*48
+** srli\s+a0,\s*a0,\s*48
+** ret
+*/
+
+DEF_SAT_U_SUB_IMM_FMT_4(uint16_t, 6)
+
+/* { dg-final { scan-rtl-dump-times ".SAT_SUB " 2 "expand" } } */
diff --git a/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-14_1.c b/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-14_1.c
new file mode 100644
index 00000000000..d8a35fe2dec
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-14_1.c
@@ -0,0 +1,21 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64gc -mabi=lp64d -O3 -fdump-rtl-expand-details -fno-schedule-insns -fno-schedule-insns2" } */
+/* { dg-final { check-function-bodies "**" "" } } */
+
+#include "sat_arith.h"
+
+/*
+** sat_u_sub_imm32768_uint16_t_fmt_4:
+** li\s+[atx][0-9]+,\s*32768
+** sub\s+[atx][0-9]+,\s*a0,\s*[atx][0-9]+
+** sltu\s+[atx][0-9]+,\s*[atx][0-9]+,\s*[atx][0-9]+
+** addi\s+a0,\s*a0,\s*-1
+** and\s+a0,\s*a0,\s*[atx][0-9]+
+** slli\s+a0,\s*a0,\s*48
+** srli\s+a0,\s*a0,\s*48
+** ret
+*/
+
+DEF_SAT_U_SUB_IMM_FMT_4(uint16_t, 32768)
+
+/* { dg-final { scan-rtl-dump-times ".SAT_SUB " 2 "expand" } } */
diff --git a/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-14_2.c b/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-14_2.c
new file mode 100644
index 00000000000..35509f22f30
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-14_2.c
@@ -0,0 +1,22 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64gc -mabi=lp64d -O3 -fdump-rtl-expand-details -fno-schedule-insns -fno-schedule-insns2" } */
+/* { dg-final { check-function-bodies "**" "" } } */
+
+#include "sat_arith.h"
+
+/*
+** sat_u_sub_imm65533_uint16_t_fmt_4:
+** li\s+[atx][0-9]+,\s*65536
+** addi\s+[atx][0-9]+,\s*[atx][0-9]+,\s*-3
+** sub\s+[atx][0-9]+,\s*a0,\s*[atx][0-9]+
+** sltu\s+[atx][0-9]+,\s*[atx][0-9]+,\s*[atx][0-9]+
+** addi\s+a0,\s*a0,\s*-1
+** and\s+a0,\s*a0,\s*[atx][0-9]+
+** slli\s+a0,\s*a0,\s*48
+** srli\s+a0,\s*a0,\s*48
+** ret
+*/
+
+DEF_SAT_U_SUB_IMM_FMT_4(uint16_t, 65533)
+
+/* { dg-final { scan-rtl-dump-times ".SAT_SUB " 2 "expand" } } */
diff --git a/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-15.c b/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-15.c
new file mode 100644
index 00000000000..7614dc885fb
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-15.c
@@ -0,0 +1,19 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64gc -mabi=lp64d -O3 -fdump-rtl-expand-details -fno-schedule-insns -fno-schedule-insns2" } */
+/* { dg-final { check-function-bodies "**" "" } } */
+
+#include "sat_arith.h"
+
+/*
+** sat_u_sub_imm255_uint32_t_fmt_4:
+** addi\s+[atx][0-9]+,\s*a0,\s*-255
+** sltiu\s+a0,\s*[atx][0-9]+,\s*255
+** addi\s+a0,\s*a0,\s*-1
+** and\s+a0,\s*a0,\s*[atx][0-9]+
+** sext\.w\s+a0,\s*a0
+** ret
+*/
+
+DEF_SAT_U_SUB_IMM_FMT_4(uint32_t, 255)
+
+/* { dg-final { scan-rtl-dump-times ".SAT_SUB " 2 "expand" } } */
diff --git a/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-15_1.c b/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-15_1.c
new file mode 100644
index 00000000000..c6b8e5ba3d4
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-15_1.c
@@ -0,0 +1,21 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64gc -mabi=lp64d -O3 -fdump-rtl-expand-details -fno-schedule-insns -fno-schedule-insns2" } */
+/* { dg-final { check-function-bodies "**" "" } } */
+
+#include "sat_arith.h"
+
+/*
+** sat_u_sub_imm2147483648_uint32_t_fmt_2:
+** li\s+[atx][0-9]+,\s*1
+** slli\s+[atx][0-9]+,\s*[atx][0-9]+,\s*31
+** sub\s+[atx][0-9]+,\s*a0,\s*[atx][0-9]+
+** sltu\s+[atx][0-9]+,\s*[atx][0-9]+,\s*[atx][0-9]+
+** addi\s+a0,\s*a0,\s*-1
+** and\s+a0,\s*a0,\s*[atx][0-9]+
+** sext\.w\s+a0,\s*a0
+** ret
+*/
+
+DEF_SAT_U_SUB_IMM_FMT_2(uint32_t, 2147483648)
+
+/* { dg-final { scan-rtl-dump-times ".SAT_SUB " 2 "expand" } } */
diff --git a/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-15_2.c b/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-15_2.c
new file mode 100644
index 00000000000..d3f94a10cf9
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-15_2.c
@@ -0,0 +1,22 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64gc -mabi=lp64d -O3 -fdump-rtl-expand-details -fno-schedule-insns -fno-schedule-insns2" } */
+/* { dg-final { check-function-bodies "**" "" } } */
+
+#include "sat_arith.h"
+
+/*
+** sat_u_sub_imm68719476732_uint32_t_fmt_2:
+** li\s+[atx][0-9]+,\s*1
+** slli\s+[atx][0-9]+,\s*[atx][0-9]+,\s*32
+** addi\s+[atx][0-9]+,\s*[atx][0-9]+,\s*-4
+** sub\s+[atx][0-9]+,\s*a0,\s*[atx][0-9]+
+** sltu\s+[atx][0-9]+,\s*[atx][0-9]+,\s*[atx][0-9]+
+** addi\s+a0,\s*a0,\s*-1
+** and\s+a0,\s*a0,\s*[atx][0-9]+
+** sext\.w\s+a0,\s*a0
+** ret
+*/
+
+DEF_SAT_U_SUB_IMM_FMT_2(uint32_t, 68719476732)
+
+/* { dg-final { scan-rtl-dump-times ".SAT_SUB " 2 "expand" } } */
diff --git a/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-16.c b/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-16.c
new file mode 100644
index 00000000000..898349d4f66
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-16.c
@@ -0,0 +1,18 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64gc -mabi=lp64d -O3 -fdump-rtl-expand-details -fno-schedule-insns -fno-schedule-insns2" } */
+/* { dg-final { check-function-bodies "**" "" } } */
+
+#include "sat_arith.h"
+
+/*
+** sat_u_sub_imm82_uint64_t_fmt_2:
+** addi\s+[atx][0-9]+,\s*[atx][0-9]+,\s*-82
+** sltiu\s+a0,\s*[atx][0-9]+,\s*82
+** addi\s+a0,\s*a0,\s*-1
+** and\s+a0,\s*a0,\s*[atx][0-9]+
+** ret
+*/
+
+DEF_SAT_U_SUB_IMM_FMT_2(uint64_t, 82)
+
+/* { dg-final { scan-rtl-dump-times ".SAT_SUB " 2 "expand" } } */
diff --git a/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-run-13.c b/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-run-13.c
new file mode 100644
index 00000000000..603f2eeab84
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-run-13.c
@@ -0,0 +1,55 @@
+/* { dg-do run { target { riscv_v } } } */
+/* { dg-additional-options "-std=c99" } */
+
+#include "sat_arith.h"
+
+DEF_SAT_U_SUB_IMM_FMT_4(uint8_t, 0)
+DEF_SAT_U_SUB_IMM_FMT_4(uint8_t, 2)
+DEF_SAT_U_SUB_IMM_FMT_4(uint8_t, 6)
+DEF_SAT_U_SUB_IMM_FMT_4(uint8_t, 129)
+DEF_SAT_U_SUB_IMM_FMT_4(uint8_t, 254)
+DEF_SAT_U_SUB_IMM_FMT_4(uint8_t, 255)
+
+#define T                       uint8_t
+#define RUN(T, op, imm, expect) RUN_SAT_U_SUB_IMM_FMT_4(T, op, imm, expect)
+
+T d[][3] = {
+  /* arg_0, arg_1, expect */
+  {      0,     0,      0, },
+  {      1,     0,      1, },
+  {      1,   255,      0, },
+  {    254,   254,      0, },
+  {    254,   255,      0, },
+  {    254,     2,    252, },
+  {    255,   254,      1, },
+  {    255,     0,    255, },
+  {      5,     2,      3, },
+  {      5,     6,      0, },
+  {    127,     0,    127, },
+  {    128,   129,      0, },
+};
+
+int
+main ()
+{
+  RUN (T,  d[0][0],   0,  d[0][2]);
+
+  RUN (T,  d[1][0],   0,  d[1][2]);
+  RUN (T,  d[2][0], 255,  d[2][2]);
+
+  RUN (T,  d[3][0], 254,  d[3][2]);
+  RUN (T,  d[4][0], 255,  d[4][2]);
+  RUN (T,  d[5][0],   2,  d[5][2]);
+
+  RUN (T,  d[6][0], 254,  d[6][2]);
+  RUN (T,  d[7][0],   0,  d[7][2]);
+
+  RUN (T,  d[8][0],   2,  d[8][2]);
+  RUN (T,  d[9][0],   6,  d[9][2]);
+
+  RUN (T, d[10][0],   0, d[10][2]);
+
+  RUN (T, d[11][0], 129, d[11][2]);
+
+  return 0;
+}
diff --git a/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-run-14.c b/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-run-14.c
new file mode 100644
index 00000000000..610e02124cf
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-run-14.c
@@ -0,0 +1,55 @@
+/* { dg-do run { target { riscv_v } } } */
+/* { dg-additional-options "-std=c99" } */
+
+#include "sat_arith.h"
+
+DEF_SAT_U_SUB_IMM_FMT_4(uint16_t, 0)
+DEF_SAT_U_SUB_IMM_FMT_4(uint16_t, 2)
+DEF_SAT_U_SUB_IMM_FMT_4(uint16_t, 6)
+DEF_SAT_U_SUB_IMM_FMT_4(uint16_t, 32767)
+DEF_SAT_U_SUB_IMM_FMT_4(uint16_t, 65534)
+DEF_SAT_U_SUB_IMM_FMT_4(uint16_t, 65535)
+
+#define T                       uint16_t
+#define RUN(T, op, imm, expect) RUN_SAT_U_SUB_IMM_FMT_4(T, op, imm, expect)
+
+T d[][3] = {
+  /* arg_0, arg_1, expect */
+  {        0,     0,      0, },
+  {        1,     0,      1, },
+  {        1, 65535,      0, },
+  {    65534, 65534,      0, },
+  {    65534, 65535,      0, },
+  {    65534,     2,  65532, },
+  {    65535, 65534,      1, },
+  {    65535,     0,  65535, },
+  {        5,     2,      3, },
+  {        5,     6,      0, },
+  {    32767,     0,  32767, },
+  {    32768, 32767,      1, },
+};
+
+int
+main ()
+{
+  RUN (T,  d[0][0],     0,  d[0][2]);
+
+  RUN (T,  d[1][0],     0,  d[1][2]);
+  RUN (T,  d[2][0], 65535,  d[2][2]);
+
+  RUN (T,  d[3][0], 65534,  d[3][2]);
+  RUN (T,  d[4][0], 65535,  d[4][2]);
+  RUN (T,  d[5][0],     2,  d[5][2]);
+
+  RUN (T,  d[6][0], 65534,  d[6][2]);
+  RUN (T,  d[7][0],     0,  d[7][2]);
+
+  RUN (T,  d[8][0],     2,  d[8][2]);
+  RUN (T,  d[9][0],     6,  d[9][2]);
+
+  RUN (T, d[10][0],     0, d[10][2]);
+
+  RUN (T, d[11][0], 32767, d[11][2]);
+
+  return 0;
+}
diff --git a/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-run-15.c b/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-run-15.c
new file mode 100644
index 00000000000..1d9e0cbbbfc
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-run-15.c
@@ -0,0 +1,54 @@
+/* { dg-do run { target { riscv_v } } } */
+/* { dg-additional-options "-std=c99" } */
+
+#include "sat_arith.h"
+
+DEF_SAT_U_SUB_IMM_FMT_4(uint32_t, 0)
+DEF_SAT_U_SUB_IMM_FMT_4(uint32_t, 2)
+DEF_SAT_U_SUB_IMM_FMT_4(uint32_t, 6)
+DEF_SAT_U_SUB_IMM_FMT_4(uint32_t, 2147483647)
+DEF_SAT_U_SUB_IMM_FMT_4(uint32_t, 4294967294)
+DEF_SAT_U_SUB_IMM_FMT_4(uint32_t, 4294967295)
+
+#define T                       uint32_t
+#define RUN(T, op, imm, expect) RUN_SAT_U_SUB_IMM_FMT_4(T, op, imm, expect)
+
+T d[][3] = {
+  /* arg_0, arg_1, expect */
+  {          0,          0,          0, },
+  {          1,          0,          1, },
+  {          1, 4294967295,          0, },
+  { 4294967294, 4294967294,          0, },
+  { 4294967294, 4294967295,          0, },
+  { 4294967294,          2, 4294967292, },
+  { 4294967295, 4294967294,          1, },
+  { 4294967295,          0, 4294967295, },
+  {          5,          2,          3, },
+  {          5,          6,          0, },
+  { 2147483647,          0, 2147483647, },
+  { 2147483648, 2147483647,          1, },
+};
+
+int
+main ()
+{
+  RUN (T,  d[0][0],          0,  d[0][2]);
+
+  RUN (T,  d[1][0],          0,  d[1][2]);
+  RUN (T,  d[2][0], 4294967295,  d[2][2]);
+
+  RUN (T,  d[3][0], 4294967294,  d[3][2]);
+  RUN (T,  d[4][0], 4294967295,  d[4][2]);
+  RUN (T,  d[5][0],          2,  d[5][2]);
+
+  RUN (T,  d[6][0], 4294967294,  d[6][2]);
+  RUN (T,  d[7][0],          0,  d[7][2]);
+
+  RUN (T,  d[8][0],          2,  d[8][2]);
+  RUN (T,  d[9][0],          6,  d[9][2]);
+
+  RUN (T, d[10][0],          0, d[10][2]);
+  RUN (T, d[11][0], 2147483647, d[11][2]);
+
+  return 0;
+}
diff --git a/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-run-16.c b/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-run-16.c
new file mode 100644
index 00000000000..f864a67220c
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/sat_u_sub_imm-run-16.c
@@ -0,0 +1,48 @@
+/* { dg-do run { target { riscv_v } } } */
+/* { dg-additional-options "-std=c99" } */
+
+#include "sat_arith.h"
+
+DEF_SAT_U_SUB_IMM_FMT_4(uint64_t, 0)
+DEF_SAT_U_SUB_IMM_FMT_4(uint64_t, 2)
+DEF_SAT_U_SUB_IMM_FMT_4(uint64_t, 6)
+DEF_SAT_U_SUB_IMM_FMT_4(uint64_t, 18446744073709551614u)
+DEF_SAT_U_SUB_IMM_FMT_4(uint64_t, 18446744073709551615u)
+
+#define T                       uint64_t
+#define RUN(T, imm, op, expect) RUN_SAT_U_SUB_IMM_FMT_4(T, imm, op, expect)
+
+T d[][3] = {
+  /* arg_0, arg_1, expect */
+  {                     0,                     0,                     0, },
+  {                     1,                     0,                     1, },
+  {                     1, 18446744073709551615u,                     0, },
+  { 18446744073709551614u, 18446744073709551614u,                     0, },
+  { 18446744073709551614u, 18446744073709551615u,                     0, },
+  { 18446744073709551614u,                     2, 18446744073709551612u, },
+  { 18446744073709551615u, 18446744073709551614u,                     1, },
+  { 18446744073709551615u,                     0, 18446744073709551615u, },
+  {                     5,                     2,                     3, },
+  {                     5,                     6,                     0, },
+};
+
+int
+main ()
+{
+  RUN (T, d[0][0],                     0, d[0][2]);
+
+  RUN (T, d[1][0],                     0, d[1][2]);
+  RUN (T, d[2][0], 18446744073709551615u, d[2][2]);
+
+  RUN (T, d[3][0], 18446744073709551614u, d[3][2]);
+  RUN (T, d[4][0], 18446744073709551615u, d[4][2]);
+  RUN (T, d[5][0],                     2, d[5][2]);
+
+  RUN (T, d[6][0], 18446744073709551614u, d[6][2]);
+  RUN (T, d[7][0],                     0, d[7][2]);
+
+  RUN (T, d[8][0],                     2, d[8][2]);
+  RUN (T, d[9][0],                     6, d[9][2]);
+
+  return 0;
+}
