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Document hpux-parisc2-cc problems, probably due to optimizer bug.

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PR: 426
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Lutz Jänicke 2003-01-14 13:57:06 +00:00
parent c653b56937
commit 52e5e5c2ba
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PROBLEMS
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@ -70,3 +70,22 @@ if compiled with WorkShop 6 compiler and -xarch=v9. The cause for
this seems to be the fact that compiler emits multiplication to
perform shift operations:-( To work the problem around configure
with './Configure solaris64-sparcv9-cc -DMD32_REG_T=int'.
* Problems with hp-parisc2-cc target when used with "no-asm" flag
When using the hp-parisc2-cc target, wrong bignum code is generated.
This is due to the SIXTY_FOUR_BIT build being compiled with the +O3
aggressive optimization.
The problem manifests itself by the BN_kronecker test hanging in an
endless loop. Reason: the BN_kronecker test calls BN_generate_prime()
which itself hangs. The reason could be tracked down to the bn_mul_comba8()
function in bn_asm.c. At some occasions the higher 32bit value of r[7]
is off by 1 (meaning: calculated=shouldbe+1). Further analysis failed,
as no debugger support possible at +O3 and additional fprintf()'s
introduced fixed the bug, therefore it is most likely a bug in the
optimizer.
The bug was found in the BN_kronecker test but may also lead to
failures in other parts of the code.
(See Ticket #426.)
Workaround: modify the target to +O2 when building with no-asm.