Hexagon (target/hexagon) Add overrides for disabled idef-parser insns

The following have overrides
    S2_insert
    S2_insert_rp
    S2_asr_r_svw_trun
    A2_swiz

These instructions have semantics that write to the destination
before all the operand reads have been completed.  Therefore,
the idef-parser versions were disabled with the short-circuit patch.

Test cases added to tests/tcg/hexagon/read_write_overlap.c

Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230427230012.3800327-16-tsimpson@quicinc.com>

tests/tcg/hexagon/Makefile.target

@@ -45,6 +45,7 @@ HEX_TESTS += fpstuff
 HEX_TESTS += overflow
 HEX_TESTS += signal_context
 HEX_TESTS += reg_mut
+HEX_TESTS += read_write_overlap
 HEX_TESTS += vector_add_int
 HEX_TESTS += scatter_gather
 HEX_TESTS += hvx_misc

tests/tcg/hexagon/read_write_overlap.c

@@ -0,0 +1,136 @@
+/*
+ *  Copyright(c) 2023 Qualcomm Innovation Center, Inc. All Rights Reserved.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * Test instructions where the semantics write to the destination
+ * before all the operand reads have been completed.
+ *
+ * These instructions are problematic when we short-circuit the
+ * register writes because the destination and source operands could
+ * be the same TCGv.
+ *
+ * We test by forcing the read and write to be register r7.
+ */
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+int err;
+
+static void __check(const char *filename, int line, int x, int expect)
+{
+    if (x != expect) {
+        printf("ERROR %s:%d - 0x%08x != 0x%08x\n",
+               filename, line, x, expect);
+        err++;
+    }
+}
+
+#define check(x, expect) __check(__FILE__, __LINE__, (x), (expect))
+
+#define insert(RES, X, WIDTH, OFFSET) \
+    asm("r7 = %1\n\t" \
+        "r7 = insert(r7, #" #WIDTH ", #" #OFFSET ")\n\t" \
+        "%0 = r7\n\t" \
+        : "=r"(RES) : "r"(X) : "r7")
+
+static void test_insert(void)
+{
+    uint32_t res;
+
+    insert(res, 0x12345678, 8, 1);
+    check(res, 0x123456f0);
+    insert(res, 0x12345678, 0, 1);
+    check(res, 0x12345678);
+    insert(res, 0x12345678, 20, 16);
+    check(res, 0x56785678);
+}
+
+static inline uint32_t insert_rp(uint32_t x, uint32_t width, uint32_t offset)
+{
+    uint64_t width_offset = (uint64_t)width << 32 | offset;
+    uint32_t res;
+    asm("r7 = %1\n\t"
+        "r7 = insert(r7, %2)\n\t"
+        "%0 = r7\n\t"
+        : "=r"(res) : "r"(x), "r"(width_offset) : "r7");
+    return res;
+
+}
+
+static void test_insert_rp(void)
+{
+    check(insert_rp(0x12345678,   8,  1), 0x123456f0);
+    check(insert_rp(0x12345678,  63,  8), 0x34567878);
+    check(insert_rp(0x12345678, 127,  8), 0x34567878);
+    check(insert_rp(0x12345678,   8, 24), 0x78345678);
+    check(insert_rp(0x12345678,   8, 63), 0x12345678);
+    check(insert_rp(0x12345678,   8, 64), 0x00000000);
+}
+
+static inline uint32_t asr_r_svw_trun(uint64_t x, uint32_t y)
+{
+    uint32_t res;
+    asm("r7 = %2\n\t"
+        "r7 = vasrw(%1, r7)\n\t"
+        "%0 = r7\n\t"
+        : "=r"(res) : "r"(x), "r"(y) : "r7");
+    return res;
+}
+
+static void test_asr_r_svw_trun(void)
+{
+    check(asr_r_svw_trun(0x1111111122222222ULL, 5),
+          0x88881111);
+    check(asr_r_svw_trun(0x1111111122222222ULL, 63),
+          0x00000000);
+    check(asr_r_svw_trun(0x1111111122222222ULL, 64),
+          0x00000000);
+    check(asr_r_svw_trun(0x1111111122222222ULL, 127),
+          0x22224444);
+    check(asr_r_svw_trun(0x1111111122222222ULL, 128),
+          0x11112222);
+    check(asr_r_svw_trun(0xffffffff22222222ULL, 128),
+          0xffff2222);
+}
+
+static inline uint32_t swiz(uint32_t x)
+{
+    uint32_t res;
+    asm("r7 = %1\n\t"
+        "r7 = swiz(r7)\n\t"
+        "%0 = r7\n\t"
+        : "=r"(res) : "r"(x) : "r7");
+    return res;
+}
+
+static void test_swiz(void)
+{
+    check(swiz(0x11223344), 0x44332211);
+}
+
+int main()
+{
+    test_insert();
+    test_insert_rp();
+    test_asr_r_svw_trun();
+    test_swiz();
+
+    puts(err ? "FAIL" : "PASS");
+    return err ? EXIT_FAILURE : EXIT_SUCCESS;
+}