RISC-V: Add testcases for form 2 of scalar signed SAT_SUB

Form 2:
  #define DEF_SAT_S_SUB_FMT_2(T, UT, MIN, MAX) \
  T __attribute__((noinline))                  \
  sat_s_sub_##T##_fmt_1 (T x, T y)             \
  {                                            \
    T minus = (UT)x - (UT)y;                   \
    if ((x ^ y) >= 0 || (minus ^ x) >= 0)      \
      return minus;                            \
    return x < 0 ? MIN : MAX;                  \
  }

DEF_SAT_S_SUB_FMT_2(int8_t, uint8_t, INT8_MIN, INT8_MAX)

The below test are passed for this patch.
* The rv64gcv fully regression test.

It is test only patch and obvious up to a point, will commit it
directly if no comments in next 48H.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/sat_arith.h: Add test helper macros.
	* gcc.target/riscv/sat_s_sub-2-i16.c: New test.
	* gcc.target/riscv/sat_s_sub-2-i32.c: New test.
	* gcc.target/riscv/sat_s_sub-2-i64.c: New test.
	* gcc.target/riscv/sat_s_sub-2-i8.c: New test.
	* gcc.target/riscv/sat_s_sub-run-2-i16.c: New test.
	* gcc.target/riscv/sat_s_sub-run-2-i32.c: New test.
	* gcc.target/riscv/sat_s_sub-run-2-i64.c: New test.
	* gcc.target/riscv/sat_s_sub-run-2-i8.c: New test.

Signed-off-by: Pan Li <pan2.li@intel.com>

9 files changed, 192 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.target/riscv/sat_arith.h b/gcc/testsuite/gcc.target/riscv/sat_arith.h
index 587f3f8..66d3933 100644
--- a/gcc/testsuite/gcc.target/riscv/sat_arith.h
+++ b/gcc/testsuite/gcc.target/riscv/sat_arith.h
@@ -367,9 +367,24 @@ sat_s_sub_##T##_fmt_1 (T x, T y)             \
 #define DEF_SAT_S_SUB_FMT_1_WRAP(T, UT, MIN, MAX) \
   DEF_SAT_S_SUB_FMT_1(T, UT, MIN, MAX)
 
+#define DEF_SAT_S_SUB_FMT_2(T, UT, MIN, MAX) \
+T __attribute__((noinline))                  \
+sat_s_sub_##T##_fmt_2 (T x, T y)             \
+{                                            \
+  T minus = (UT)x - (UT)y;                   \
+  if ((x ^ y) >= 0 || (minus ^ x) >= 0)      \
+    return minus;                            \
+  return x < 0 ? MIN : MAX;                  \
+}
+#define DEF_SAT_S_SUB_FMT_2_WRAP(T, UT, MIN, MAX) \
+  DEF_SAT_S_SUB_FMT_2(T, UT, MIN, MAX)
+
 #define RUN_SAT_S_SUB_FMT_1(T, x, y) sat_s_sub_##T##_fmt_1(x, y)
 #define RUN_SAT_S_SUB_FMT_1_WRAP(T, x, y) RUN_SAT_S_SUB_FMT_1(T, x, y)
 
+#define RUN_SAT_S_SUB_FMT_2(T, x, y) sat_s_sub_##T##_fmt_2(x, y)
+#define RUN_SAT_S_SUB_FMT_2_WRAP(T, x, y) RUN_SAT_S_SUB_FMT_2(T, x, y)
+
 /******************************************************************************/
 /* Saturation Truncate (unsigned and signed)                                  */
 /******************************************************************************/
diff --git a/gcc/testsuite/gcc.target/riscv/sat_s_sub-2-i16.c b/gcc/testsuite/gcc.target/riscv/sat_s_sub-2-i16.c
new file mode 100644
index 0000000..6aac2c7
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/sat_s_sub-2-i16.c
@@ -0,0 +1,30 @@
+/* { 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_s_sub_int16_t_fmt_2:
+** sub\s+[atx][0-9]+,\s*a0,\s*a1
+** xor\s+[atx][0-9]+,\s*a0,\s*a1
+** xor\s+[atx][0-9]+,\s*a0,\s*[atx][0-9]+
+** and\s+[atx][0-9]+,\s*[atx][0-9]+,\s*[atx][0-9]+
+** srli\s+[atx][0-9]+,\s*[atx][0-9]+,\s*15
+** andi\s+[atx][0-9]+,\s*[atx][0-9]+,\s*1
+** srai\s+[atx][0-9]+,\s*[atx][0-9]+,\s*63
+** li\s+[atx][0-9]+,\s*32768
+** addi\s+[atx][0-9]+,\s*[atx][0-9]+,\s*-1
+** xor\s+[atx][0-9]+,\s*[atx][0-9]+,\s*[atx][0-9]+
+** neg\s+[atx][0-9]+,\s*[atx][0-9]+
+** and\s+[atx][0-9]+,\s*[atx][0-9]+,\s*[atx][0-9]+
+** addi\s+[atx][0-9]+,\s*[atx][0-9]+,\s*-1
+** and\s+[atx][0-9]+,\s*[atx][0-9]+,\s*[atx][0-9]+
+** or\s+a0,\s*[atx][0-9]+,\s*[atx][0-9]+
+** slliw\s+a0,\s*a0,\s*16
+** sraiw\s+a0,\s*a0,\s*16
+** ret
+*/
+DEF_SAT_S_SUB_FMT_2(int16_t, uint16_t, INT16_MIN, INT16_MAX)
+
+/* { dg-final { scan-rtl-dump-times ".SAT_SUB " 2 "expand" } } */
diff --git a/gcc/testsuite/gcc.target/riscv/sat_s_sub-2-i32.c b/gcc/testsuite/gcc.target/riscv/sat_s_sub-2-i32.c
new file mode 100644
index 0000000..a113f52
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/sat_s_sub-2-i32.c
@@ -0,0 +1,28 @@
+/* { 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_s_sub_int32_t_fmt_2:
+** sub\s+[atx][0-9]+,\s*a0,\s*a1
+** xor\s+[atx][0-9]+,\s*a0,\s*a1
+** xor\s+[atx][0-9]+,\s*a0,\s*[atx][0-9]+
+** and\s+[atx][0-9]+,\s*[atx][0-9]+,\s*[atx][0-9]+
+** srliw\s+[atx][0-9]+,\s*[atx][0-9]+,\s*31
+** srai\s+[atx][0-9]+,\s*[atx][0-9]+,\s*63
+** li\s+[atx][0-9]+,\s*-2147483648
+** xori\s+[atx][0-9]+,\s*[atx][0-9]+,\s*-1
+** xor\s+[atx][0-9]+,\s*[atx][0-9]+,\s*[atx][0-7]
+** neg\s+[atx][0-9]+,\s*[atx][0-9]+
+** and\s+[atx][0-9]+,\s*[atx][0-9]+,\s*[atx][0-9]+
+** addi\s+[atx][0-9]+,\s*[atx][0-9]+,\s*-1
+** and\s+[atx][0-9]+,\s*[atx][0-9]+,\s*[atx][0-9]+
+** or\s+a0,\s*[atx][0-9]+,\s*[atx][0-9]+
+** sext\.w\s+a0,\s*[atx][0-9]+
+** ret
+*/
+DEF_SAT_S_SUB_FMT_2(int32_t, uint32_t, INT32_MIN, INT32_MAX)
+
+/* { dg-final { scan-rtl-dump-times ".SAT_SUB " 2 "expand" } } */
diff --git a/gcc/testsuite/gcc.target/riscv/sat_s_sub-2-i64.c b/gcc/testsuite/gcc.target/riscv/sat_s_sub-2-i64.c
new file mode 100644
index 0000000..34cfbd2
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/sat_s_sub-2-i64.c
@@ -0,0 +1,27 @@
+/* { 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_s_sub_int64_t_fmt_2:
+** sub\s+[atx][0-9]+,\s*a0,\s*a1
+** xor\s+[atx][0-9]+,\s*a0,\s*a1
+** xor\s+[atx][0-9]+,\s*a0,\s*[atx][0-9]+
+** and\s+[atx][0-9]+,\s*[atx][0-9]+,\s*[atx][0-9]+
+** srli\s+[atx][0-9]+,\s*[atx][0-9]+,\s*63
+** srai\s+[atx][0-9]+,\s*[atx][0-9]+,\s*63
+** li\s+[atx][0-9]+,\s*-1
+** srli\s+[atx][0-9]+,\s*[atx][0-9]+,\s*1
+** xor\s+[atx][0-9]+,\s*[atx][0-9]+,\s*[atx][0-9]+
+** neg\s+[atx][0-9]+,\s*[atx][0-9]+
+** and\s+[atx][0-9]+,\s*[atx][0-9]+,\s*[atx][0-9]+
+** addi\s+[atx][0-9]+,\s*[atx][0-9]+,\s*-1
+** and\s+[atx][0-9]+,\s*[atx][0-9]+,\s*[atx][0-9]+
+** or\s+a0,\s*[atx][0-9]+,\s*[atx][0-9]+
+** ret
+*/
+DEF_SAT_S_SUB_FMT_2(int64_t, uint64_t, INT64_MIN, INT64_MAX)
+
+/* { dg-final { scan-rtl-dump-times ".SAT_SUB " 2 "expand" } } */
diff --git a/gcc/testsuite/gcc.target/riscv/sat_s_sub-2-i8.c b/gcc/testsuite/gcc.target/riscv/sat_s_sub-2-i8.c
new file mode 100644
index 0000000..04d73aa
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/sat_s_sub-2-i8.c
@@ -0,0 +1,28 @@
+/* { 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_s_sub_int8_t_fmt_2:
+** sub\s+[atx][0-9]+,\s*a0,\s*a1
+** xor\s+[atx][0-9]+,\s*a0,\s*a1
+** xor\s+[atx][0-9]+,\s*a0,\s*[atx][0-9]+
+** and\s+[atx][0-9]+,\s*[atx][0-9]+,\s*[atx][0-9]+
+** srli\s+[atx][0-9]+,\s*[atx][0-9]+,\s*7
+** andi\s+[atx][0-9]+,\s*[atx][0-9]+,\s*1
+** srai\s+[atx][0-9]+,\s*[atx][0-9]+,\s*63
+** xori\s+[atx][0-9]+,\s*[atx][0-9]+,\s*127
+** neg\s+[atx][0-9]+,\s*[atx][0-9]+
+** and\s+[atx][0-9]+,\s*[atx][0-9]+,\s*[atx][0-9]+
+** addi\s+[atx][0-9]+,\s*[atx][0-9]+,\s*-1
+** and\s+[atx][0-9]+,\s*[atx][0-9]+,\s*[atx][0-9]+
+** or\s+a0,\s*[atx][0-9]+,\s*[atx][0-9]+
+** slliw\s+a0,\s*a0,\s*24
+** sraiw\s+a0,\s*a0,\s*24
+** ret
+*/
+DEF_SAT_S_SUB_FMT_2(int8_t, uint8_t, INT8_MIN, INT8_MAX)
+
+/* { dg-final { scan-rtl-dump-times ".SAT_SUB " 2 "expand" } } */
diff --git a/gcc/testsuite/gcc.target/riscv/sat_s_sub-run-2-i16.c b/gcc/testsuite/gcc.target/riscv/sat_s_sub-run-2-i16.c
new file mode 100644
index 0000000..08a9b5c
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/sat_s_sub-run-2-i16.c
@@ -0,0 +1,16 @@
+/* { dg-do run { target { riscv_v } } } */
+/* { dg-additional-options "-std=c99" } */
+
+#include "sat_arith.h"
+#include "sat_arith_data.h"
+
+#define T1 int16_t
+#define T2 uint16_t
+
+DEF_SAT_S_SUB_FMT_2_WRAP(T1, T2, INT16_MIN, INT16_MAX)
+
+#define DATA             TEST_BINARY_DATA_WRAP(T1, sssub)
+#define T                TEST_BINARY_STRUCT_DECL(T1, sssub)
+#define RUN_BINARY(x, y) RUN_SAT_S_SUB_FMT_2_WRAP(T1, x, y)
+
+#include "scalar_sat_binary_run_xxx.h"
diff --git a/gcc/testsuite/gcc.target/riscv/sat_s_sub-run-2-i32.c b/gcc/testsuite/gcc.target/riscv/sat_s_sub-run-2-i32.c
new file mode 100644
index 0000000..fc79969
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/sat_s_sub-run-2-i32.c
@@ -0,0 +1,16 @@
+/* { dg-do run { target { riscv_v } } } */
+/* { dg-additional-options "-std=c99" } */
+
+#include "sat_arith.h"
+#include "sat_arith_data.h"
+
+#define T1 int32_t
+#define T2 uint32_t
+
+DEF_SAT_S_SUB_FMT_2_WRAP(T1, T2, INT32_MIN, INT32_MAX)
+
+#define DATA             TEST_BINARY_DATA_WRAP(T1, sssub)
+#define T                TEST_BINARY_STRUCT_DECL(T1, sssub)
+#define RUN_BINARY(x, y) RUN_SAT_S_SUB_FMT_2_WRAP(T1, x, y)
+
+#include "scalar_sat_binary_run_xxx.h"
diff --git a/gcc/testsuite/gcc.target/riscv/sat_s_sub-run-2-i64.c b/gcc/testsuite/gcc.target/riscv/sat_s_sub-run-2-i64.c
new file mode 100644
index 0000000..8d5f745
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/sat_s_sub-run-2-i64.c
@@ -0,0 +1,16 @@
+/* { dg-do run { target { riscv_v } } } */
+/* { dg-additional-options "-std=c99" } */
+
+#include "sat_arith.h"
+#include "sat_arith_data.h"
+
+#define T1 int64_t
+#define T2 uint64_t
+
+DEF_SAT_S_SUB_FMT_2_WRAP(T1, T2, INT64_MIN, INT64_MAX)
+
+#define DATA             TEST_BINARY_DATA_WRAP(T1, sssub)
+#define T                TEST_BINARY_STRUCT_DECL(T1, sssub)
+#define RUN_BINARY(x, y) RUN_SAT_S_SUB_FMT_2_WRAP(T1, x, y)
+
+#include "scalar_sat_binary_run_xxx.h"
diff --git a/gcc/testsuite/gcc.target/riscv/sat_s_sub-run-2-i8.c b/gcc/testsuite/gcc.target/riscv/sat_s_sub-run-2-i8.c
new file mode 100644
index 0000000..9f6ef30
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/sat_s_sub-run-2-i8.c
@@ -0,0 +1,16 @@
+/* { dg-do run { target { riscv_v } } } */
+/* { dg-additional-options "-std=c99" } */
+
+#include "sat_arith.h"
+#include "sat_arith_data.h"
+
+#define T1 int8_t
+#define T2 uint8_t
+
+DEF_SAT_S_SUB_FMT_2_WRAP(T1, T2, INT8_MIN, INT8_MAX)
+
+#define DATA             TEST_BINARY_DATA_WRAP(T1, sssub)
+#define T                TEST_BINARY_STRUCT_DECL(T1, sssub)
+#define RUN_BINARY(x, y) RUN_SAT_S_SUB_FMT_2_WRAP(T1, x, y)
+
+#include "scalar_sat_binary_run_xxx.h"