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| author | Herbert Valerio Riedel <hvr@gnu.org> | 2016-03-24 20:35:42 +0100 |
|---|---|---|
| committer | Herbert Valerio Riedel <hvr@gnu.org> | 2016-03-24 20:43:59 +0100 |
| commit | 343349df1f19f21899818d647bf570e489d0cf8f (patch) | |
| tree | 28e2c1b134cc2c9e3519d55be9966166e9eae45d /includes | |
| parent | cb08f8da37ff5fb99e1d02b8afdcb802d23e9a8d (diff) | |
| download | haskell-343349df1f19f21899818d647bf570e489d0cf8f.tar.gz | |
Avoid local label syntax for assembler on AIX
Unfortunately (for inline `__asm__()` uses), IBM's `as` doesn't seem to support
local labels[1] like GNU `as` does so we need to workaround this when on AIX.
[1]: https://sourceware.org/binutils/docs/as/Symbol-Names.html#Symbol-Names
Turns out this also addresses the long-standing bug #485
Reviewed By: bgamari, trommler
Differential Revision: https://phabricator.haskell.org/D2029
Diffstat (limited to 'includes')
| -rw-r--r-- | includes/stg/SMP.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/includes/stg/SMP.h b/includes/stg/SMP.h index 756f0401ab..21f05edad3 100644 --- a/includes/stg/SMP.h +++ b/includes/stg/SMP.h @@ -121,9 +121,18 @@ xchg(StgPtr p, StgWord w) ); #elif powerpc_HOST_ARCH __asm__ __volatile__ ( +# if aix_HOST_OS + /* IBM's assembler doesn't seem to support local labels so we use + * explicit relative numeric offsets to workaround this limitation + */ + " lwarx %0, 0, %2\n" + " stwcx. %1, 0, %2\n" + " bne- $-8" +# else // aix_HOST_OS "1: lwarx %0, 0, %2\n" " stwcx. %1, 0, %2\n" " bne- 1b" +# endif :"=&r" (result) :"r" (w), "r" (p) ); @@ -205,12 +214,23 @@ cas(StgVolatilePtr p, StgWord o, StgWord n) #elif powerpc_HOST_ARCH StgWord result; __asm__ __volatile__ ( +# if aix_HOST_OS + /* IBM's assembler doesn't seem to support local labels so we use + * explicit relative numeric offsets to workaround this limitation + */ + " lwarx %0, 0, %3\n" + " cmpw %0, %1\n" + " bne $+12\n" + " stwcx. %2, 0, %3\n" + " bne- $-16\n" +# else // aix_HOST_OS "1: lwarx %0, 0, %3\n" " cmpw %0, %1\n" " bne 2f\n" " stwcx. %2, 0, %3\n" " bne- 1b\n" "2:" +# endif // !aix_HOST_OS :"=&r" (result) :"r" (o), "r" (n), "r" (p) :"cc", "memory" |