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-rw-r--r--gcc/tree-ssa-math-opts.cc105
1 files changed, 96 insertions, 9 deletions
diff --git a/gcc/tree-ssa-math-opts.cc b/gcc/tree-ssa-math-opts.cc
index 486bdbf..ca98205 100644
--- a/gcc/tree-ssa-math-opts.cc
+++ b/gcc/tree-ssa-math-opts.cc
@@ -1053,6 +1053,7 @@ pass_cse_reciprocals::execute (function *fun)
continue;
gimple_replace_ssa_lhs (call, arg1);
+ reset_flow_sensitive_info (arg1);
if (gimple_call_internal_p (call) != (ifn != IFN_LAST))
{
auto_vec<tree, 4> args;
@@ -2800,7 +2801,17 @@ convert_mult_to_widen (gimple *stmt, gimple_stmt_iterator *gsi)
return false;
if (actual_precision != TYPE_PRECISION (type1)
|| from_unsigned1 != TYPE_UNSIGNED (type1))
- type1 = build_nonstandard_integer_type (actual_precision, from_unsigned1);
+ {
+ if (!useless_type_conversion_p (type1, TREE_TYPE (rhs1)))
+ {
+ if (TREE_CODE (rhs1) == INTEGER_CST)
+ rhs1 = fold_convert (type1, rhs1);
+ else
+ rhs1 = build_and_insert_cast (gsi, loc, type1, rhs1);
+ }
+ type1 = build_nonstandard_integer_type (actual_precision,
+ from_unsigned1);
+ }
if (!useless_type_conversion_p (type1, TREE_TYPE (rhs1)))
{
if (TREE_CODE (rhs1) == INTEGER_CST)
@@ -2810,7 +2821,17 @@ convert_mult_to_widen (gimple *stmt, gimple_stmt_iterator *gsi)
}
if (actual_precision != TYPE_PRECISION (type2)
|| from_unsigned2 != TYPE_UNSIGNED (type2))
- type2 = build_nonstandard_integer_type (actual_precision, from_unsigned2);
+ {
+ if (!useless_type_conversion_p (type2, TREE_TYPE (rhs2)))
+ {
+ if (TREE_CODE (rhs2) == INTEGER_CST)
+ rhs2 = fold_convert (type2, rhs2);
+ else
+ rhs2 = build_and_insert_cast (gsi, loc, type2, rhs2);
+ }
+ type2 = build_nonstandard_integer_type (actual_precision,
+ from_unsigned2);
+ }
if (!useless_type_conversion_p (type2, TREE_TYPE (rhs2)))
{
if (TREE_CODE (rhs2) == INTEGER_CST)
@@ -3021,7 +3042,17 @@ convert_plusminus_to_widen (gimple_stmt_iterator *gsi, gimple *stmt,
actual_precision = GET_MODE_PRECISION (actual_mode);
if (actual_precision != TYPE_PRECISION (type1)
|| from_unsigned1 != TYPE_UNSIGNED (type1))
- type1 = build_nonstandard_integer_type (actual_precision, from_unsigned1);
+ {
+ if (!useless_type_conversion_p (type1, TREE_TYPE (mult_rhs1)))
+ {
+ if (TREE_CODE (mult_rhs1) == INTEGER_CST)
+ mult_rhs1 = fold_convert (type1, mult_rhs1);
+ else
+ mult_rhs1 = build_and_insert_cast (gsi, loc, type1, mult_rhs1);
+ }
+ type1 = build_nonstandard_integer_type (actual_precision,
+ from_unsigned1);
+ }
if (!useless_type_conversion_p (type1, TREE_TYPE (mult_rhs1)))
{
if (TREE_CODE (mult_rhs1) == INTEGER_CST)
@@ -3031,7 +3062,17 @@ convert_plusminus_to_widen (gimple_stmt_iterator *gsi, gimple *stmt,
}
if (actual_precision != TYPE_PRECISION (type2)
|| from_unsigned2 != TYPE_UNSIGNED (type2))
- type2 = build_nonstandard_integer_type (actual_precision, from_unsigned2);
+ {
+ if (!useless_type_conversion_p (type2, TREE_TYPE (mult_rhs2)))
+ {
+ if (TREE_CODE (mult_rhs2) == INTEGER_CST)
+ mult_rhs2 = fold_convert (type2, mult_rhs2);
+ else
+ mult_rhs2 = build_and_insert_cast (gsi, loc, type2, mult_rhs2);
+ }
+ type2 = build_nonstandard_integer_type (actual_precision,
+ from_unsigned2);
+ }
if (!useless_type_conversion_p (type2, TREE_TYPE (mult_rhs2)))
{
if (TREE_CODE (mult_rhs2) == INTEGER_CST)
@@ -4023,6 +4064,7 @@ arith_overflow_check_p (gimple *stmt, gimple *cast_stmt, gimple *&use_stmt,
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_unsigned_integer_sat_mul (tree, tree*, tree (*)(tree));
extern bool gimple_signed_integer_sat_add (tree, tree*, tree (*)(tree));
extern bool gimple_signed_integer_sat_sub (tree, tree*, tree (*)(tree));
@@ -4064,15 +4106,34 @@ build_saturation_binary_arith_call_and_insert (gimple_stmt_iterator *gsi,
* _10 = -_9;
* _12 = _7 | _10;
* =>
- * _12 = .SAT_ADD (_4, _6); */
+ * _12 = .SAT_ADD (_4, _6);
+ *
+ * Try to match IMM=-1 saturation signed add with assign.
+ * <bb 2> [local count: 1073741824]:
+ * x.0_1 = (unsigned char) x_5(D);
+ * _3 = -x.0_1;
+ * _10 = (signed char) _3;
+ * _8 = x_5(D) & _10;
+ * if (_8 < 0)
+ * goto <bb 4>; [1.40%]
+ * else
+ * goto <bb 3>; [98.60%]
+ * <bb 3> [local count: 434070867]:
+ * _2 = x.0_1 + 255;
+ * <bb 4> [local count: 1073741824]:
+ * # _9 = PHI <_2(3), 128(2)>
+ * _4 = (int8_t) _9;
+ * =>
+ * _4 = .SAT_ADD (x_5, -1); */
static void
-match_unsigned_saturation_add (gimple_stmt_iterator *gsi, gassign *stmt)
+match_saturation_add_with_assign (gimple_stmt_iterator *gsi, gassign *stmt)
{
tree ops[2];
tree lhs = gimple_assign_lhs (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))
build_saturation_binary_arith_call_and_replace (gsi, IFN_SAT_ADD, lhs,
ops[0], ops[1]);
}
@@ -4157,6 +4218,30 @@ match_unsigned_saturation_sub (gimple_stmt_iterator *gsi, gassign *stmt)
}
/*
+ * Try to match saturation unsigned mul.
+ * _1 = (unsigned int) a_6(D);
+ * _2 = (unsigned int) b_7(D);
+ * x_8 = _1 * _2;
+ * overflow_9 = x_8 > 255;
+ * _3 = (unsigned char) overflow_9;
+ * _4 = -_3;
+ * _5 = (unsigned char) x_8;
+ * _10 = _4 | _5;
+ * =>
+ * _10 = .SAT_SUB (a_6, b_7); */
+
+static void
+match_unsigned_saturation_mul (gimple_stmt_iterator *gsi, gassign *stmt)
+{
+ tree ops[2];
+ tree lhs = gimple_assign_lhs (stmt);
+
+ if (gimple_unsigned_integer_sat_mul (lhs, ops, NULL))
+ build_saturation_binary_arith_call_and_replace (gsi, IFN_SAT_MUL, lhs,
+ ops[0], ops[1]);
+}
+
+/*
* Try to match saturation unsigned sub.
* <bb 2> [local count: 1073741824]:
* if (x_2(D) > y_3(D))
@@ -6363,7 +6448,7 @@ math_opts_dom_walker::after_dom_children (basic_block bb)
break;
case PLUS_EXPR:
- match_unsigned_saturation_add (&gsi, as_a<gassign *> (stmt));
+ match_saturation_add_with_assign (&gsi, as_a<gassign *> (stmt));
match_unsigned_saturation_sub (&gsi, as_a<gassign *> (stmt));
/* fall-through */
case MINUS_EXPR:
@@ -6389,7 +6474,7 @@ math_opts_dom_walker::after_dom_children (basic_block bb)
break;
case BIT_IOR_EXPR:
- match_unsigned_saturation_add (&gsi, as_a<gassign *> (stmt));
+ match_saturation_add_with_assign (&gsi, as_a<gassign *> (stmt));
match_unsigned_saturation_trunc (&gsi, as_a<gassign *> (stmt));
/* fall-through */
case BIT_XOR_EXPR:
@@ -6409,7 +6494,9 @@ math_opts_dom_walker::after_dom_children (basic_block bb)
break;
case NOP_EXPR:
+ match_unsigned_saturation_mul (&gsi, as_a<gassign *> (stmt));
match_unsigned_saturation_trunc (&gsi, as_a<gassign *> (stmt));
+ match_saturation_add_with_assign (&gsi, as_a<gassign *> (stmt));
break;
default:;
generated by cgit v1.1 at 2025-07-10 05:32:06 +0000