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/*
* Tiny Code Generator for QEMU
*
* Copyright (c) 2008 Fabrice Bellard
*
* 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.
*/
#ifndef TCG_COND_H
#define TCG_COND_H
/*
* Conditions. Note that these are laid out for easy manipulation by
* the functions below:
* bit 0 is used for inverting;
* bit 1 is used for conditions that need swapping (signed/unsigned).
* bit 2 is used with bit 1 for swapping.
* bit 3 is used for unsigned conditions.
*/
typedef enum {
/* non-signed */
TCG_COND_NEVER = 0 | 0 | 0 | 0,
TCG_COND_ALWAYS = 0 | 0 | 0 | 1,
/* equality */
TCG_COND_EQ = 8 | 0 | 0 | 0,
TCG_COND_NE = 8 | 0 | 0 | 1,
/* "test" i.e. and then compare vs 0 */
TCG_COND_TSTEQ = 8 | 4 | 0 | 0,
TCG_COND_TSTNE = 8 | 4 | 0 | 1,
/* signed */
TCG_COND_LT = 0 | 0 | 2 | 0,
TCG_COND_GE = 0 | 0 | 2 | 1,
TCG_COND_GT = 0 | 4 | 2 | 0,
TCG_COND_LE = 0 | 4 | 2 | 1,
/* unsigned */
TCG_COND_LTU = 8 | 0 | 2 | 0,
TCG_COND_GEU = 8 | 0 | 2 | 1,
TCG_COND_GTU = 8 | 4 | 2 | 0,
TCG_COND_LEU = 8 | 4 | 2 | 1,
} TCGCond;
/* Invert the sense of the comparison. */
static inline TCGCond tcg_invert_cond(TCGCond c)
{
return (TCGCond)(c ^ 1);
}
/* Swap the operands in a comparison. */
static inline TCGCond tcg_swap_cond(TCGCond c)
{
return (TCGCond)(c ^ ((c & 2) << 1));
}
/* Must a comparison be considered signed? */
static inline bool is_signed_cond(TCGCond c)
{
return (c & (8 | 2)) == 2;
}
/* Must a comparison be considered unsigned? */
static inline bool is_unsigned_cond(TCGCond c)
{
return (c & (8 | 2)) == (8 | 2);
}
/* Must a comparison be considered a test? */
static inline bool is_tst_cond(TCGCond c)
{
return (c | 1) == TCG_COND_TSTNE;
}
/* Create an "unsigned" version of a "signed" comparison. */
static inline TCGCond tcg_unsigned_cond(TCGCond c)
{
return is_signed_cond(c) ? (TCGCond)(c + 8) : c;
}
/* Create a "signed" version of an "unsigned" comparison. */
static inline TCGCond tcg_signed_cond(TCGCond c)
{
return is_unsigned_cond(c) ? (TCGCond)(c - 8) : c;
}
/* Create the eq/ne version of a tsteq/tstne comparison. */
static inline TCGCond tcg_tst_eqne_cond(TCGCond c)
{
return is_tst_cond(c) ? (TCGCond)(c - 4) : c;
}
/* Create the lt/ge version of a tstne/tsteq comparison of the sign. */
static inline TCGCond tcg_tst_ltge_cond(TCGCond c)
{
return is_tst_cond(c) ? (TCGCond)(c ^ 0xf) : c;
}
/*
* Create a "high" version of a double-word comparison.
* This removes equality from a LTE or GTE comparison.
*/
static inline TCGCond tcg_high_cond(TCGCond c)
{
switch (c) {
case TCG_COND_GE:
case TCG_COND_LE:
case TCG_COND_GEU:
case TCG_COND_LEU:
return (TCGCond)(c ^ (4 | 1));
default:
return c;
}
}
#endif /* TCG_COND_H */
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