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author | Hans Wennborg <hans@hanshq.net> | 2018-02-22 13:24:27 +0000 |
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committer | Hans Wennborg <hans@hanshq.net> | 2018-02-22 13:24:27 +0000 |
commit | 7449cddfd99b83cbcb61ec193a046ccb521996a0 (patch) | |
tree | cfff0e5775741e10622b8aeef6526c5fac77e5c0 /docs | |
parent | 5d413c4a80edad74d83341b0c2568ce0411ce829 (diff) |
ReleaseNotes: The fast-math-flags changes
By Sanjay Patel!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_60@325776 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'docs')
-rw-r--r-- | docs/ReleaseNotes.rst | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/docs/ReleaseNotes.rst b/docs/ReleaseNotes.rst index a0df1890987..6dcca287fe1 100644 --- a/docs/ReleaseNotes.rst +++ b/docs/ReleaseNotes.rst @@ -74,6 +74,15 @@ Non-comprehensive list of changes in this release Changes to the LLVM IR ---------------------- +* The fast-math-flags (FMF) have been updated. Previously, the 'fast' flag + indicated that floating-point reassociation was allowed and all other flags + were set too. The 'fast' flag still exists, but there is a new flag called + 'reassoc' to indicate specifically that reassociation is allowed. A new bit + called 'afn' was also added to selectively allow approximations for common + mathlib functions like square-root. The new flags provide more flexibility + to enable/disable specific floating-point optimizations. Making the + optimizer respond appropriately to these flags is an ongoing effort. + Changes to the AArch64 Target ----------------------------- |