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authorJoseph Myers <joseph@codesourcery.com>2015-02-06 15:41:49 +0000
committerJoseph Myers <joseph@codesourcery.com>2015-02-06 15:41:49 +0000
commit61f006c12d8ff3a80a95a36fed81c908a2e39650 (patch)
treeb669c8f9c4ef70907f386bf034f5567fcded7ba7 /math
parent639e42eb901b69d3a4d6414751c60fab0ca25119 (diff)
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soft-fp: Refine FP_EX_DENORM handling for comparisons.
In <https://sourceware.org/ml/libc-alpha/2014-09/msg00488.html>, I noted that comparisons in soft-fp did not set FP_EX_DENORM unless denormal operands were flushed to zero. This patch fixes soft-fp to check for denormal operands for comparisons and set that exception whenever FP_EX_DENORM is not zero. In particular, for the one architecture for which the Linux kernel defines FP_EX_DENORM (alpha), this corresponds to the existing logic for comparisons and so allows that logic to be replaced by a simple call to FP_CMP_D when soft-fp is updated in the kernel. Tested for powerpc (e500) that installed stripped shared libraries are unchanged by this patch. * soft-fp/op-common.h (_FP_CMP_CHECK_DENORM): New macro. (_FP_CMP_CHECK_FLUSH_ZERO): Likewise. (_FP_CMP): Use_FP_CMP_CHECK_DENORM and _FP_CMP_CHECK_FLUSH_ZERO. (_FP_CMP_EQ): Likewise. (_FP_CMP_UNORD): Use _FP_CMP_CHECK_DENORM.
Diffstat (limited to 'math')
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