From: Pan Li <pan2...@intel.com>
This patch would like to support the vector signed ssadd pattern
for the RISC-V backend. Aka
Form 1:
#define DEF_VEC_SAT_S_ADD_FMT_1(T, UT, MIN, MAX) \
void __attribute__((noinline)) \
vec_sat_s_add_##T##_fmt_1 (T *out, T *x, T *y, unsigned n) \
{ \
for (unsigned i = 0; i < n; i++) \
{ \
T sum = (UT)x[i] + (UT)y[i]; \
out[i] = (x[i] ^ y[i]) < 0 \
? sum \
: (sum ^ x[i]) >= 0 \
? sum \
: x[i] < 0 ? MIN : MAX; \
} \
}
DEF_VEC_SAT_S_ADD_FMT_1(int64_t, uint64_t, INT64_MIN, INT64_MAX)
If the backend implemented the vector mode of ssadd, we will see IR diff
similar as below:
Before this patch:
108 │ _114 = .SELECT_VL (ivtmp_112, POLY_INT_CST [2, 2]);
109 │ ivtmp_77 = _114 * 8;
110 │ vect__4.9_80 = .MASK_LEN_LOAD (vectp_x.7_78, 64B, { -1, ... },
_114, 0);
111 │ vect__5.10_81 = VIEW_CONVERT_EXPR<vector([2,2]) long unsigned
int>(vect__4.9_80);
112 │ vect__7.13_85 = .MASK_LEN_LOAD (vectp_y.11_83, 64B, { -1, ... },
_114, 0);
113 │ vect__8.14_86 = VIEW_CONVERT_EXPR<vector([2,2]) long unsigned
int>(vect__7.13_85);
114 │ vect__9.15_87 = vect__5.10_81 + vect__8.14_86;
115 │ vect_sum_20.16_88 = VIEW_CONVERT_EXPR<vector([2,2]) long
int>(vect__9.15_87);
116 │ vect__10.17_89 = vect__4.9_80 ^ vect__7.13_85;
117 │ vect__11.18_90 = vect__4.9_80 ^ vect_sum_20.16_88;
118 │ mask__46.19_92 = vect__10.17_89 >= { 0, ... };
119 │ _36 = vect__4.9_80 >> 63;
120 │ mask__44.26_104 = vect__11.18_90 < { 0, ... };
121 │ mask__43.27_105 = mask__46.19_92 & mask__44.26_104;
122 │ _115 = .COND_XOR (mask__43.27_105, _36, { 9223372036854775807, ...
}, vect_sum_20.16_88);
123 │ .MASK_LEN_STORE (vectp_out.29_108, 64B, { -1, ... }, _114, 0, _115);
124 │ vectp_x.7_79 = vectp_x.7_78 + ivtmp_77;
125 │ vectp_y.11_84 = vectp_y.11_83 + ivtmp_77;
126 │ vectp_out.29_109 = vectp_out.29_108 + ivtmp_77;
127 │ ivtmp_113 = ivtmp_112 - _114;
After this patch:
94 │ # vectp_x.7_82 = PHI <vectp_x.7_83(6), x_18(D)(5)>
95 │ # vectp_y.10_86 = PHI <vectp_y.10_87(6), y_19(D)(5)>
96 │ # vectp_out.14_91 = PHI <vectp_out.14_92(6), out_21(D)(5)>
97 │ # ivtmp_95 = PHI <ivtmp_96(6), _94(5)>
98 │ _97 = .SELECT_VL (ivtmp_95, POLY_INT_CST [2, 2]);
99 │ ivtmp_81 = _97 * 8;
100 │ vect__4.9_84 = .MASK_LEN_LOAD (vectp_x.7_82, 64B, { -1, ... }, _97,
0);
101 │ vect__7.12_88 = .MASK_LEN_LOAD (vectp_y.10_86, 64B, { -1, ... },
_97, 0);
102 │ vect_patt_40.13_89 = .SAT_ADD (vect__4.9_84, vect__7.12_88);
103 │ .MASK_LEN_STORE (vectp_out.14_91, 64B, { -1, ... }, _97, 0,
vect_patt_40.13_89);
104 │ vectp_x.7_83 = vectp_x.7_82 + ivtmp_81;
105 │ vectp_y.10_87 = vectp_y.10_86 + ivtmp_81;
106 │ vectp_out.14_92 = vectp_out.14_91 + ivtmp_81;
107 │ ivtmp_96 = ivtmp_95 - _97;
The below test suites are passed for this patch:
1. The rv64gcv fully regression tests.
2. The x86 bootstrap tests.
3. The x86 fully regression tests.
gcc/ChangeLog:
* match.pd: Add case 2 for the signed .SAT_ADD consumed by
vect pattern.
* tree-vect-patterns.cc (gimple_signed_integer_sat_add): Add new
matching func decl for signed .SAT_ADD.
(vect_recog_sat_add_pattern): Add signed .SAT_ADD pattern match.
Signed-off-by: Pan Li <pan2...@intel.com>
---
gcc/match.pd | 17 +++++++++++++++++
gcc/tree-vect-patterns.cc | 5 ++++-
2 files changed, 21 insertions(+), 1 deletion(-)
diff --git a/gcc/match.pd b/gcc/match.pd
index be211535a49..578c9dd5b77 100644
--- a/gcc/match.pd
+++ b/gcc/match.pd
@@ -3207,6 +3207,23 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
(if (INTEGRAL_TYPE_P (type) && !TYPE_UNSIGNED (type)
&& types_match (type, @0, @1))))
+/* Signed saturation add, case 2:
+ T sum = (T)((UT)X + (UT)Y)
+ SAT_S_ADD = (X ^ Y) < 0 && (X ^ sum) >= 0 ? (-(T)(X < 0) ^ MAX) : sum;
+
+ The T and UT are type pair like T=int8_t, UT=uint8_t. */
+(match (signed_integer_sat_add @0 @1)
+ (cond^ (bit_and:c (lt (bit_xor:c @0 (nop_convert@2 (plus (nop_convert @0)
+ (nop_convert @1))))
+ integer_zerop)
+ (ge (bit_xor:c @0 @1) integer_zerop))
+ (bit_xor:c (nop_convert (negate (nop_convert (convert
+ (lt @0 integer_zerop)))))
+ max_value)
+ @2)
+ (if (INTEGRAL_TYPE_P (type) && !TYPE_UNSIGNED (type)
+ && types_match (type, @0, @1))))
+
/* Unsigned saturation sub, case 1 (branch with gt):
SAT_U_SUB = X > Y ? X - Y : 0 */
(match (unsigned_integer_sat_sub @0 @1)
diff --git a/gcc/tree-vect-patterns.cc b/gcc/tree-vect-patterns.cc
index 3162250bbdd..8504dc06760 100644
--- a/gcc/tree-vect-patterns.cc
+++ b/gcc/tree-vect-patterns.cc
@@ -4497,6 +4497,8 @@ extern bool gimple_unsigned_integer_sat_add (tree, tree*,
tree (*)(tree));
extern bool gimple_unsigned_integer_sat_sub (tree, tree*, tree (*)(tree));
extern bool gimple_unsigned_integer_sat_trunc (tree, tree*, tree (*)(tree));
+extern bool gimple_signed_integer_sat_add (tree, tree*, tree (*)(tree));
+
static gimple *
vect_recog_build_binary_gimple_stmt (vec_info *vinfo, stmt_vec_info stmt_info,
internal_fn fn, tree *type_out,
@@ -4557,7 +4559,8 @@ vect_recog_sat_add_pattern (vec_info *vinfo,
stmt_vec_info stmt_vinfo,
tree ops[2];
tree lhs = gimple_assign_lhs (last_stmt);
- if (gimple_unsigned_integer_sat_add (lhs, ops, NULL))
+ if (gimple_unsigned_integer_sat_add (lhs, ops, NULL)
+ || gimple_signed_integer_sat_add (lhs, ops, NULL))
{
if (TREE_CODE (ops[1]) == INTEGER_CST)
ops[1] = fold_convert (TREE_TYPE (ops[0]), ops[1]);
--
2.43.0
