| # contrib/arm/neon.dfa |
| # |
| # This is a dfa fragment that is added to DFA_HARDWARE in Makefile.am and |
| # consequently is inserted after scripts/pnglibconf.dfa to define extra, |
| # hardware, options. |
| # |
| # The following are required in any fragment to record the copyright holder of |
| # the *changes* and the appropriate email for bug reports. Note that the |
| # copyright here is just for the specific configuration; additional files may |
| # have additional and/or different copyrights. |
| # |
| # Later settings (e.g. in user.dfa) will override these settings. |
| # |
| setting USER_PRIVATEBUILD default "John Bowler" |
| setting USER_BUG_REPORTS default "jbowler@acm.org" |
| # |
| # These options are specific to the ARM NEON hardware optimizations. At present |
| # these optimizations depend on GCC specific pre-processing of an assembler (.S) |
| # file so they probably won't work with other compilers. |
| # |
| # ARM_NEON_OPT: unset: check at compile time (__ARM_NEON__ must be defined by |
| # the compiler, typically as a result of specifying |
| # CC="gcc -mfpu=neon".) |
| # 0: disable (even if the CPU has a NEON FPU.) |
| # 1: check at run time (via ARM_NEON_{API,CHECK}) |
| # 2: switch on unconditionally (inadvisable - instead pass |
| # -mfpu=neon to GCC in CC) |
| # When building libpng avoid using any setting other than '0'; '1' is |
| # set automatically when either 'API' or 'CHECK' are configured in, |
| # '2' should not be necessary as -mfpu=neon will achieve the same |
| # effect as well as applying NEON optimizations to the rest of the |
| # libpng code. |
| # NOTE: any setting other than '0' requires ALIGNED_MEMORY |
| # ARM_NEON_API: (PNG_ARM_NEON == 1) allow the optimization to be switched on |
| # with png_set_option |
| # ARM_NEON_CHECK: (PNG_ARM_NEON == 1) compile a run-time check to see if Neon |
| # extensions are supported. This is poorly supported and |
| # deprecated - use the png_set_option API. |
| setting ARM_NEON_OPT |
| option ARM_NEON_API disabled enables SET_OPTION sets ARM_NEON_OPT 1 |
| option ARM_NEON_CHECK disabled sets ARM_NEON_OPT 1 |
