+/** ia32 condition codes (the numbers correspond to the real encoding order) */
+typedef enum ia32_condition_code_t {
+ ia32_cc_negated = 0x01, /**< negates condition */
+
+ ia32_cc_overflow = 0x00, /**< OF=1 */
+ ia32_cc_below = 0x02, /**< CF=1 */
+ ia32_cc_equal = 0x04, /**< ZF=1 */
+ ia32_cc_below_equal = 0x06, /**< ZF=1 or CF=1 */
+ ia32_cc_sign = 0x08, /**< SF=1 */
+ ia32_cc_parity = 0x0A, /**< PF=1 */
+ ia32_cc_less = 0x0C, /**< SF!=OF */
+ ia32_cc_less_equal = 0x0E, /**< ZF=1 or SF!=OF */
+ ia32_cc_not_overflow = ia32_cc_negated|ia32_cc_overflow, /**< OF=0 */
+ ia32_cc_above_equal = ia32_cc_negated|ia32_cc_below, /**< CF=0 */
+ ia32_cc_not_equal = ia32_cc_negated|ia32_cc_equal, /**< ZF=0 */
+ ia32_cc_above = ia32_cc_negated|ia32_cc_below_equal, /**< ZF=0 and CF=0 */
+ ia32_cc_not_sign = ia32_cc_negated|ia32_cc_sign, /**< SF=0 */
+ ia32_cc_not_parity = ia32_cc_negated|ia32_cc_parity, /**< PF=0 */
+ ia32_cc_greater_equal = ia32_cc_negated|ia32_cc_less, /**< SF=OF */
+ ia32_cc_greater = ia32_cc_negated|ia32_cc_less_equal, /**< ZF=0 and SF=OF */
+
+ /* the following codes are (unfortunately) NOT real hardware codes but
+ * simplify our backend as you need these combinations for some
+ * floatingpoint compares (the emitter will split them into multiple
+ * instructions) */
+ ia32_cc_float_parity_cases = 0x20,
+ /* we need even more cases as inversing the cc is different for float
+ * comparisons (though for the following we need no special
+ * parity+x combinations) */
+ ia32_cc_additional_float_cases = 0x10,
+
+ /* make sure that the lower 4 bit correspond to the real encoding
+ * (of the comparison not involving the parity special) */
+ ia32_cc_float_equal = 0x34, /**< PF=0 and ZF=1 */
+ ia32_cc_float_below = 0x32, /**< PF=0 and CF=1 */
+ ia32_cc_float_below_equal = 0x36, /**< PF=0 and (ZF=1 or CF=1) */
+ ia32_cc_float_not_equal = ia32_cc_negated|ia32_cc_float_equal, /**< PF=1 or ZF=0 */
+ ia32_cc_float_unordered_above_equal
+ = ia32_cc_negated|ia32_cc_float_below, /**< PF=1 or CF=0 */
+ ia32_cc_float_unordered_above
+ = ia32_cc_negated|ia32_cc_float_below_equal, /**< PF=1 or (ZF=0 and CF=0) */
+
+ ia32_cc_float_unordered_below_equal = 0x16, /**< ZF=1 or CF=1 */
+ ia32_cc_float_unordered_below = 0x12, /**< CF=1 */
+ ia32_cc_float_above =
+ ia32_cc_negated|ia32_cc_float_unordered_below_equal, /**< ZF=0 and CF=0 */
+ ia32_cc_float_above_equal
+ = ia32_cc_negated|ia32_cc_float_unordered_below, /**< CF=0 */
+} ia32_condition_code_t;
+ENUM_BITSET(ia32_condition_code_t)
+
+static inline ia32_condition_code_t ia32_negate_condition_code(
+ ia32_condition_code_t code)
+{
+ return code ^ ia32_cc_negated;
+}
+
+static inline ia32_condition_code_t ia32_invert_condition_code(
+ ia32_condition_code_t code)
+{
+ /* doesn't appear to have any systematic, so use a table */
+ switch (code) {
+ case ia32_cc_below: return ia32_cc_above;
+ case ia32_cc_below_equal: return ia32_cc_above_equal;
+ case ia32_cc_above: return ia32_cc_below;
+ case ia32_cc_above_equal: return ia32_cc_below_equal;
+ case ia32_cc_less: return ia32_cc_greater;
+ case ia32_cc_less_equal: return ia32_cc_greater_equal;
+ case ia32_cc_greater: return ia32_cc_less;
+ case ia32_cc_greater_equal: return ia32_cc_less_equal;
+ case ia32_cc_float_below: return ia32_cc_float_above;
+ case ia32_cc_float_below_equal: return ia32_cc_float_above_equal;
+ case ia32_cc_float_above: return ia32_cc_float_below;
+ case ia32_cc_float_above_equal: return ia32_cc_float_below_equal;
+ case ia32_cc_float_unordered_below: return ia32_cc_float_unordered_above;
+ case ia32_cc_float_unordered_below_equal: return ia32_cc_float_unordered_above_equal;
+ case ia32_cc_float_unordered_above: return ia32_cc_float_unordered_below;
+ case ia32_cc_float_unordered_above_equal: return ia32_cc_float_unordered_below_equal;
+ default: return code;
+ }
+}