| /* Macros to test for CPU features on ARM. Generic ARM version. |
| Copyright (C) 2012-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C 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 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C 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 the GNU C Library. If not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef _ARM_ARM_FEATURES_H |
| #define _ARM_ARM_FEATURES_H 1 |
| |
| /* An OS-specific arm-features.h file should define ARM_HAVE_VFP to |
| an appropriate expression for testing at runtime whether the VFP |
| hardware is present. We'll then redefine it to a constant if we |
| know at compile time that we can assume VFP. */ |
| |
| #ifndef __SOFTFP__ |
| /* The compiler is generating VFP instructions, so we're already |
| assuming the hardware exists. */ |
| # undef ARM_HAVE_VFP |
| # define ARM_HAVE_VFP 1 |
| #endif |
| |
| /* An OS-specific arm-features.h file may define ARM_ASSUME_NO_IWMMXT |
| to indicate at compile time that iWMMXt hardware is never present |
| at runtime (or that we never care about its state) and so need not |
| be checked for. */ |
| |
| /* A more-specific arm-features.h file may define ARM_ALWAYS_BX to indicate |
| that instructions using pc as a destination register must never be used, |
| so a "bx" (or "blx") instruction is always required. */ |
| |
| /* The log2 of the minimum alignment required for an address that |
| is the target of a computed branch (i.e. a "bx" instruction). |
| A more-specific arm-features.h file may define this to set a more |
| stringent requirement. |
| |
| Using this only makes sense for code in ARM mode (where instructions |
| always have a fixed size of four bytes), or for Thumb-mode code that is |
| specifically aligning all the related branch targets to match (since |
| Thumb instructions might be either two or four bytes). */ |
| #ifndef ARM_BX_ALIGN_LOG2 |
| # define ARM_BX_ALIGN_LOG2 2 |
| #endif |
| |
| /* An OS-specific arm-features.h file may define ARM_NO_INDEX_REGISTER to |
| indicate that the two-register addressing modes must never be used. */ |
| |
| #endif /* arm-features.h */ |
