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Minor documentation clarrification on the impact of ICC -fp-model except option.

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Jean-Luc Duprat
2012-08-01 10:24:35 -07:00
parent bda566d6a7
commit 52836aae87
1 changed files with 7 additions and 6 deletions
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docs/ispc.rst
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@@ -606,12 +606,13 @@ run on Xeon Phi, though there are a number of known limitations:
* When requesting that ICC generate code with strict floating point * When requesting that ICC generate code with strict floating point
precision compliance (using ICC option ``-fp-model strict``) or precision compliance (using ICC option ``-fp-model strict``) or
using of floating point exceptions (using ICC option ``-fp-model accurate reporting of floating point exceptions (using ICC option
except``) the compiler will generate code that uses the x87 unit ``-fp-model except``) the compiler will generate code that uses the
rather than KNC's vector unit. For similar reasons, the options x87 unit rather than KNC's vector unit. For similar reasons, the
``–ansi`` and ``–fmath-errno`` may result in calls to math functions options ``–ansi`` and ``–fmath-errno`` may result in calls to math
that are implemented in x87 rather than KNC instructions. This will functions that are implemented in x87 rather than KNC instructions.
have a significant performance impact. This will have a significant performance impact. See the ICC manual
for details on these compiler options.
All of these issues are currently actively being addressed and will be All of these issues are currently actively being addressed and will be
fixed in future releases. fixed in future releases.