102 lines
3.0 KiB
C
102 lines
3.0 KiB
C
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/*
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* Tiny Code Generator for QEMU
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*
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* Copyright (c) 2008 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef TCG_COND_H
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#define TCG_COND_H
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/*
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* Conditions. Note that these are laid out for easy manipulation by
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* the functions below:
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* bit 0 is used for inverting;
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* bit 1 is signed,
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* bit 2 is unsigned,
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* bit 3 is used with bit 0 for swapping signed/unsigned.
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*/
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typedef enum {
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/* non-signed */
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TCG_COND_NEVER = 0 | 0 | 0 | 0,
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TCG_COND_ALWAYS = 0 | 0 | 0 | 1,
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TCG_COND_EQ = 8 | 0 | 0 | 0,
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TCG_COND_NE = 8 | 0 | 0 | 1,
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/* signed */
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TCG_COND_LT = 0 | 0 | 2 | 0,
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TCG_COND_GE = 0 | 0 | 2 | 1,
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TCG_COND_LE = 8 | 0 | 2 | 0,
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TCG_COND_GT = 8 | 0 | 2 | 1,
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/* unsigned */
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TCG_COND_LTU = 0 | 4 | 0 | 0,
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TCG_COND_GEU = 0 | 4 | 0 | 1,
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TCG_COND_LEU = 8 | 4 | 0 | 0,
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TCG_COND_GTU = 8 | 4 | 0 | 1,
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} TCGCond;
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/* Invert the sense of the comparison. */
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static inline TCGCond tcg_invert_cond(TCGCond c)
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{
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return (TCGCond)(c ^ 1);
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}
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/* Swap the operands in a comparison. */
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static inline TCGCond tcg_swap_cond(TCGCond c)
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{
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return c & 6 ? (TCGCond)(c ^ 9) : c;
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}
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/* Create an "unsigned" version of a "signed" comparison. */
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static inline TCGCond tcg_unsigned_cond(TCGCond c)
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{
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return c & 2 ? (TCGCond)(c ^ 6) : c;
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}
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/* Create a "signed" version of an "unsigned" comparison. */
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static inline TCGCond tcg_signed_cond(TCGCond c)
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{
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return c & 4 ? (TCGCond)(c ^ 6) : c;
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}
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/* Must a comparison be considered unsigned? */
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static inline bool is_unsigned_cond(TCGCond c)
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{
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return (c & 4) != 0;
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}
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/*
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* Create a "high" version of a double-word comparison.
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* This removes equality from a LTE or GTE comparison.
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*/
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static inline TCGCond tcg_high_cond(TCGCond c)
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{
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switch (c) {
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case TCG_COND_GE:
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case TCG_COND_LE:
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case TCG_COND_GEU:
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case TCG_COND_LEU:
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return (TCGCond)(c ^ 8);
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default:
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return c;
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}
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}
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#endif /* TCG_COND_H */
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