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tcg-cond.h (3042B)

      1 /*
      2  * Tiny Code Generator for QEMU
      3  *
      4  * Copyright (c) 2008 Fabrice Bellard
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a copy
      7  * of this software and associated documentation files (the "Software"), to deal
      8  * in the Software without restriction, including without limitation the rights
      9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     10  * copies of the Software, and to permit persons to whom the Software is
     11  * furnished to do so, subject to the following conditions:
     12  *
     13  * The above copyright notice and this permission notice shall be included in
     14  * all copies or substantial portions of the Software.
     15  *
     16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
     19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
     22  * THE SOFTWARE.
     23  */
     24 
     25 #ifndef TCG_COND_H
     26 #define TCG_COND_H
     27 
     28 /*
     29  * Conditions.  Note that these are laid out for easy manipulation by
     30  * the functions below:
     31  *    bit 0 is used for inverting;
     32  *    bit 1 is signed,
     33  *    bit 2 is unsigned,
     34  *    bit 3 is used with bit 0 for swapping signed/unsigned.
     35  */
     36 typedef enum {
     37     /* non-signed */
     38     TCG_COND_NEVER  = 0 | 0 | 0 | 0,
     39     TCG_COND_ALWAYS = 0 | 0 | 0 | 1,
     40     TCG_COND_EQ     = 8 | 0 | 0 | 0,
     41     TCG_COND_NE     = 8 | 0 | 0 | 1,
     42     /* signed */
     43     TCG_COND_LT     = 0 | 0 | 2 | 0,
     44     TCG_COND_GE     = 0 | 0 | 2 | 1,
     45     TCG_COND_LE     = 8 | 0 | 2 | 0,
     46     TCG_COND_GT     = 8 | 0 | 2 | 1,
     47     /* unsigned */
     48     TCG_COND_LTU    = 0 | 4 | 0 | 0,
     49     TCG_COND_GEU    = 0 | 4 | 0 | 1,
     50     TCG_COND_LEU    = 8 | 4 | 0 | 0,
     51     TCG_COND_GTU    = 8 | 4 | 0 | 1,
     52 } TCGCond;
     53 
     54 /* Invert the sense of the comparison.  */
     55 static inline TCGCond tcg_invert_cond(TCGCond c)
     56 {
     57     return (TCGCond)(c ^ 1);
     58 }
     59 
     60 /* Swap the operands in a comparison.  */
     61 static inline TCGCond tcg_swap_cond(TCGCond c)
     62 {
     63     return c & 6 ? (TCGCond)(c ^ 9) : c;
     64 }
     65 
     66 /* Create an "unsigned" version of a "signed" comparison.  */
     67 static inline TCGCond tcg_unsigned_cond(TCGCond c)
     68 {
     69     return c & 2 ? (TCGCond)(c ^ 6) : c;
     70 }
     71 
     72 /* Create a "signed" version of an "unsigned" comparison.  */
     73 static inline TCGCond tcg_signed_cond(TCGCond c)
     74 {
     75     return c & 4 ? (TCGCond)(c ^ 6) : c;
     76 }
     77 
     78 /* Must a comparison be considered unsigned?  */
     79 static inline bool is_unsigned_cond(TCGCond c)
     80 {
     81     return (c & 4) != 0;
     82 }
     83 
     84 /*
     85  * Create a "high" version of a double-word comparison.
     86  * This removes equality from a LTE or GTE comparison.
     87  */
     88 static inline TCGCond tcg_high_cond(TCGCond c)
     89 {
     90     switch (c) {
     91     case TCG_COND_GE:
     92     case TCG_COND_LE:
     93     case TCG_COND_GEU:
     94     case TCG_COND_LEU:
     95         return (TCGCond)(c ^ 8);
     96     default:
     97         return c;
     98     }
     99 }
    100 
    101 #endif /* TCG_COND_H */