Initial commit of d32e8d0b8d9e0ef7cf7ab2e74548982972789dfc from qemu-kvm

1 files changed, 105 insertions, 0 deletions

diff --git a/host-utils.c b/host-utils.c
new file mode 100644
index 0000000..dc96123
--- /dev/null
+++ b/host-utils.c
@@ -0,0 +1,105 @@
+/*
+ * Utility compute operations used by translated code.
+ *
+ * Copyright (c) 2003 Fabrice Bellard
+ * Copyright (c) 2007 Aurelien Jarno
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <stdlib.h>
+#include <stdint.h>
+#include "host-utils.h"
+
+//#define DEBUG_MULDIV
+
+/* Long integer helpers */
+#if !defined(__x86_64__)
+static void add128 (uint64_t *plow, uint64_t *phigh, uint64_t a, uint64_t b)
+{
+    *plow += a;
+    /* carry test */
+    if (*plow < a)
+        (*phigh)++;
+    *phigh += b;
+}
+
+static void neg128 (uint64_t *plow, uint64_t *phigh)
+{
+    *plow = ~*plow;
+    *phigh = ~*phigh;
+    add128(plow, phigh, 1, 0);
+}
+
+static void mul64 (uint64_t *plow, uint64_t *phigh, uint64_t a, uint64_t b)
+{
+    uint32_t a0, a1, b0, b1;
+    uint64_t v;
+
+    a0 = a;
+    a1 = a >> 32;
+
+    b0 = b;
+    b1 = b >> 32;
+
+    v = (uint64_t)a0 * (uint64_t)b0;
+    *plow = v;
+    *phigh = 0;
+
+    v = (uint64_t)a0 * (uint64_t)b1;
+    add128(plow, phigh, v << 32, v >> 32);
+
+    v = (uint64_t)a1 * (uint64_t)b0;
+    add128(plow, phigh, v << 32, v >> 32);
+
+    v = (uint64_t)a1 * (uint64_t)b1;
+    *phigh += v;
+}
+
+/* Unsigned 64x64 -> 128 multiplication */
+void mulu64 (uint64_t *plow, uint64_t *phigh, uint64_t a, uint64_t b)
+{
+    mul64(plow, phigh, a, b);
+#if defined(DEBUG_MULDIV)
+    printf("mulu64: 0x%016llx * 0x%016llx = 0x%016llx%016llx\n",
+           a, b, *phigh, *plow);
+#endif
+}
+
+/* Signed 64x64 -> 128 multiplication */
+void muls64 (uint64_t *plow, uint64_t *phigh, int64_t a, int64_t b)
+{
+    int sa, sb;
+
+    sa = (a < 0);
+    if (sa)
+        a = -a;
+    sb = (b < 0);
+    if (sb)
+        b = -b;
+    mul64(plow, phigh, a, b);
+    if (sa ^ sb) {
+        neg128(plow, phigh);
+    }
+#if defined(DEBUG_MULDIV)
+    printf("muls64: 0x%016llx * 0x%016llx = 0x%016llx%016llx\n",
+           a, b, *phigh, *plow);
+#endif
+}
+#endif /* !defined(__x86_64__) */