--- /dev/null
+/*
+ * x86 condition code helpers
+ *
+ * Copyright (c) 2008 Fabrice Bellard
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#define DATA_BITS (1 << (3 + SHIFT))
+
+#if DATA_BITS == 8
+#define SUFFIX b
+#define DATA_TYPE uint8_t
+#elif DATA_BITS == 16
+#define SUFFIX w
+#define DATA_TYPE uint16_t
+#elif DATA_BITS == 32
+#define SUFFIX l
+#define DATA_TYPE uint32_t
+#elif DATA_BITS == 64
+#define SUFFIX q
+#define DATA_TYPE uint64_t
+#else
+#error unhandled operand size
+#endif
+
+#define SIGN_MASK (((DATA_TYPE)1) << (DATA_BITS - 1))
+
+/* dynamic flags computation */
+
+static int glue(compute_all_add, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
+{
+ int cf, pf, af, zf, sf, of;
+ DATA_TYPE src2 = dst - src1;
+
+ cf = dst < src1;
+ pf = parity_table[(uint8_t)dst];
+ af = (dst ^ src1 ^ src2) & CC_A;
+ zf = (dst == 0) * CC_Z;
+ sf = lshift(dst, 8 - DATA_BITS) & CC_S;
+ of = lshift((src1 ^ src2 ^ -1) & (src1 ^ dst), 12 - DATA_BITS) & CC_O;
+ return cf | pf | af | zf | sf | of;
+}
+
+static int glue(compute_c_add, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
+{
+ return dst < src1;
+}
+
+static int glue(compute_all_adc, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1,
+ DATA_TYPE src3)
+{
+ int cf, pf, af, zf, sf, of;
+ DATA_TYPE src2 = dst - src1 - src3;
+
+ cf = (src3 ? dst <= src1 : dst < src1);
+ pf = parity_table[(uint8_t)dst];
+ af = (dst ^ src1 ^ src2) & 0x10;
+ zf = (dst == 0) << 6;
+ sf = lshift(dst, 8 - DATA_BITS) & 0x80;
+ of = lshift((src1 ^ src2 ^ -1) & (src1 ^ dst), 12 - DATA_BITS) & CC_O;
+ return cf | pf | af | zf | sf | of;
+}
+
+static int glue(compute_c_adc, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1,
+ DATA_TYPE src3)
+{
+ return src3 ? dst <= src1 : dst < src1;
+}
+
+static int glue(compute_all_sub, SUFFIX)(DATA_TYPE dst, DATA_TYPE src2)
+{
+ int cf, pf, af, zf, sf, of;
+ DATA_TYPE src1 = dst + src2;
+
+ cf = src1 < src2;
+ pf = parity_table[(uint8_t)dst];
+ af = (dst ^ src1 ^ src2) & CC_A;
+ zf = (dst == 0) * CC_Z;
+ sf = lshift(dst, 8 - DATA_BITS) & CC_S;
+ of = lshift((src1 ^ src2) & (src1 ^ dst), 12 - DATA_BITS) & CC_O;
+ return cf | pf | af | zf | sf | of;
+}
+
+static int glue(compute_c_sub, SUFFIX)(DATA_TYPE dst, DATA_TYPE src2)
+{
+ DATA_TYPE src1 = dst + src2;
+
+ return src1 < src2;
+}
+
+static int glue(compute_all_sbb, SUFFIX)(DATA_TYPE dst, DATA_TYPE src2,
+ DATA_TYPE src3)
+{
+ int cf, pf, af, zf, sf, of;
+ DATA_TYPE src1 = dst + src2 + src3;
+
+ cf = (src3 ? src1 <= src2 : src1 < src2);
+ pf = parity_table[(uint8_t)dst];
+ af = (dst ^ src1 ^ src2) & 0x10;
+ zf = (dst == 0) << 6;
+ sf = lshift(dst, 8 - DATA_BITS) & 0x80;
+ of = lshift((src1 ^ src2) & (src1 ^ dst), 12 - DATA_BITS) & CC_O;
+ return cf | pf | af | zf | sf | of;
+}
+
+static int glue(compute_c_sbb, SUFFIX)(DATA_TYPE dst, DATA_TYPE src2,
+ DATA_TYPE src3)
+{
+ DATA_TYPE src1 = dst + src2 + src3;
+
+ return (src3 ? src1 <= src2 : src1 < src2);
+}
+
+static int glue(compute_all_logic, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
+{
+ int cf, pf, af, zf, sf, of;
+
+ cf = 0;
+ pf = parity_table[(uint8_t)dst];
+ af = 0;
+ zf = (dst == 0) * CC_Z;
+ sf = lshift(dst, 8 - DATA_BITS) & CC_S;
+ of = 0;
+ return cf | pf | af | zf | sf | of;
+}
+
+static int glue(compute_all_inc, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
+{
+ int cf, pf, af, zf, sf, of;
+ DATA_TYPE src2;
+
+ cf = src1;
+ src1 = dst - 1;
+ src2 = 1;
+ pf = parity_table[(uint8_t)dst];
+ af = (dst ^ src1 ^ src2) & CC_A;
+ zf = (dst == 0) * CC_Z;
+ sf = lshift(dst, 8 - DATA_BITS) & CC_S;
+ of = (dst == SIGN_MASK) * CC_O;
+ return cf | pf | af | zf | sf | of;
+}
+
+static int glue(compute_all_dec, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
+{
+ int cf, pf, af, zf, sf, of;
+ DATA_TYPE src2;
+
+ cf = src1;
+ src1 = dst + 1;
+ src2 = 1;
+ pf = parity_table[(uint8_t)dst];
+ af = (dst ^ src1 ^ src2) & CC_A;
+ zf = (dst == 0) * CC_Z;
+ sf = lshift(dst, 8 - DATA_BITS) & CC_S;
+ of = (dst == SIGN_MASK - 1) * CC_O;
+ return cf | pf | af | zf | sf | of;
+}
+
+static int glue(compute_all_shl, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
+{
+ int cf, pf, af, zf, sf, of;
+
+ cf = (src1 >> (DATA_BITS - 1)) & CC_C;
+ pf = parity_table[(uint8_t)dst];
+ af = 0; /* undefined */
+ zf = (dst == 0) * CC_Z;
+ sf = lshift(dst, 8 - DATA_BITS) & CC_S;
+ /* of is defined iff shift count == 1 */
+ of = lshift(src1 ^ dst, 12 - DATA_BITS) & CC_O;
+ return cf | pf | af | zf | sf | of;
+}
+
+static int glue(compute_c_shl, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
+{
+ return (src1 >> (DATA_BITS - 1)) & CC_C;
+}
+
+static int glue(compute_all_sar, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
+{
+ int cf, pf, af, zf, sf, of;
+
+ cf = src1 & 1;
+ pf = parity_table[(uint8_t)dst];
+ af = 0; /* undefined */
+ zf = (dst == 0) * CC_Z;
+ sf = lshift(dst, 8 - DATA_BITS) & CC_S;
+ /* of is defined iff shift count == 1 */
+ of = lshift(src1 ^ dst, 12 - DATA_BITS) & CC_O;
+ return cf | pf | af | zf | sf | of;
+}
+
+/* NOTE: we compute the flags like the P4. On olders CPUs, only OF and
+ CF are modified and it is slower to do that. Note as well that we
+ don't truncate SRC1 for computing carry to DATA_TYPE. */
+static int glue(compute_all_mul, SUFFIX)(DATA_TYPE dst, target_long src1)
+{
+ int cf, pf, af, zf, sf, of;
+
+ cf = (src1 != 0);
+ pf = parity_table[(uint8_t)dst];
+ af = 0; /* undefined */
+ zf = (dst == 0) * CC_Z;
+ sf = lshift(dst, 8 - DATA_BITS) & CC_S;
+ of = cf * CC_O;
+ return cf | pf | af | zf | sf | of;
+}
+
+static int glue(compute_all_bmilg, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
+{
+ int cf, pf, af, zf, sf, of;
+
+ cf = (src1 == 0);
+ pf = 0; /* undefined */
+ af = 0; /* undefined */
+ zf = (dst == 0) * CC_Z;
+ sf = lshift(dst, 8 - DATA_BITS) & CC_S;
+ of = 0;
+ return cf | pf | af | zf | sf | of;
+}
+
+static int glue(compute_c_bmilg, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1)
+{
+ return src1 == 0;
+}
+
+#undef DATA_BITS
+#undef SIGN_MASK
+#undef DATA_TYPE
+#undef DATA_MASK
+#undef SUFFIX
Code Review / kvmfornfv.git / blobdiff