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authorPaolo Bonzini <pbonzini@redhat.com>2012-12-20 15:58:44 +0100
committerPaolo Bonzini <pbonzini@redhat.com>2013-01-12 18:42:50 +0100
commitbaacf04799ace72a9c735dd9306a1ceaf305e7cf (patch)
tree5e6750afe4b31c4343f9dd4bc07827cbdcb51466 /util/host-utils.c
parentf157ebba2de4a6225679e13cc1ce01ff5d147c76 (diff)
build: move libqemuutil.a components to util/
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'util/host-utils.c')
-rw-r--r--util/host-utils.c105
1 files changed, 105 insertions, 0 deletions
diff --git a/util/host-utils.c b/util/host-utils.c
new file mode 100644
index 0000000000..5e3915abba
--- /dev/null
+++ b/util/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 "qemu/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__) */