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comparison spandsp-0.0.6pre17/config/ax_misaligned_access_fails.m4 @ 4:26cd8f1ef0b1
import spandsp-0.0.6pre17
| author | Peter Meerwald <pmeerw@cosy.sbg.ac.at> |
|---|---|
| date | Fri, 25 Jun 2010 15:50:58 +0200 |
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| children |
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| 3:c6c5a16ce2f2 | 4:26cd8f1ef0b1 |
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| 1 # AX_MISALIGNED_ACCESS_FAILS(MACHINE, [ACTION-IF-MISALIGNED-FAILS], [ACTION-IF-MISALIGNED-OK]) | |
| 2 # ------------------------------------------------------------------------------------- | |
| 3 # | |
| 4 # Check if a specified machine type cannot handle misaligned data. That is, multi-byte data | |
| 5 # types which are not properly aligned in memory fail. Many machines are happy to work with | |
| 6 # misaligned data, but slowing down a bit. Other machines just won't tolerate such data. | |
| 7 # | |
| 8 # This is a simple lookup amongst machines known to the current autotools. So far we only deal | |
| 9 # with the ARM and sparc. | |
| 10 # A lookup is used, as many of the devices which cannot handled misaligned access are embedded | |
| 11 # processors, for which the code normally be cross-compiled. | |
| 12 # | |
| 13 AC_DEFUN([AX_MISALIGNED_ACCESS_FAILS], | |
| 14 [AS_VAR_PUSHDEF([ac_MisalignedAccessFails], [ac_cv_misaligned_access_fails_$1])dnl | |
| 15 AC_CACHE_CHECK([if $1 fails on misaligned memory access], ac_MisalignedAccessFails, | |
| 16 [case $1 in | |
| 17 arc | arm | arm[bl]e | arme[lb] | armv[2345] | armv[345][lb] \ | |
| 18 | bfin \ | |
| 19 | sparc \ | |
| 20 | xscale | xscalee[bl] \ | |
| 21 | arm-* | armbe-* | armle-* | armeb-* | armv*-* \ | |
| 22 | bfin-* \ | |
| 23 | sparc-* \ | |
| 24 | xscale-* | xscalee[bl]-* ) | |
| 25 AS_VAR_SET(ac_MisalignedAccessFails, yes) | |
| 26 ;; | |
| 27 *) | |
| 28 AS_VAR_SET(ac_MisalignedAccessFails, no) | |
| 29 ;; | |
| 30 esac]) | |
| 31 AS_IF([test AS_VAR_GET(ac_MisalignedAccessFails) = yes], [$2], [$3])[]dnl | |
| 32 AS_VAR_POPDEF([ac_MisalignedAccessFails])dnl | |
| 33 ])# MISALIGNED_ACCESS_FAILS |