Displaying 2 results from an estimated 2 matches for "floationg".
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2016 Mar 29
1
NEON FP flags
...specified. This is because
NEON hardware does not fully implement the IEEE 754 standard for
floating-point arithmetic (in particular denormal values are treated
as zero), so the use of NEON instructions may lead to a loss of
precision.
That is to say, GCC will only auto-vectorize floationg-point arithmetic
if both -mfpu=neon AND -funsafe-math-optimizations are given. -mfpu=neon
by itself does not imply that it is OK for GCC to generate non-IEEE
compliant code. The default is safe until explicitly told otherwise.
> Clang defaults to -mfpu=neon when we choose -mcpu=cortex-a* or
>...
2016 Mar 25
3
NEON FP flags
On 25 March 2016 at 04:11, Hal Finkel <hfinkel at anl.gov> wrote:
> As I understand it, the fundamental property being addresses here is: Are the semantics of scalar FP math the same as vector FP math? TTI seems like a good place to expose that information. If the semantics are indeed different, then the vectorizer would require fast-math flags in order to vectorize FP operations