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doc improvements and a pragma, which probably does nothing

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This commit is contained in:
Martin Reinecke 2019-02-27 10:44:38 +01:00
parent 5a010d3970
commit 540e7e44f8
2 changed files with 8 additions and 3 deletions
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6
COMPILE
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@ -15,7 +15,7 @@ flags.
Fast math
---------
Specifying "-ffast-math" is important for all compilers, since it allows the
Specifying "-ffast-math" or "-ffp-contract=fast" is important for all compilers, since it allows the
compiler to fuse multiplications and additions into FMA instructions, which is
forbidden by the C99 standard. Since FMAs are a central aspect of the algorithm,
they are needed for optimum performance.
@ -25,8 +25,8 @@ to the C99 standard, you should still be able to compile libsharp with
"-ffast-math" without any problems.
Runtime CPU selection with gcc
------------------------------
Runtime CPU selection with gcc and clang
----------------------------------------
When using a recent gcc (6.0 and newer) or a recent clang (successfully tested
with versions 6 and 7) on an x86_64 platform, the build machinery can compile