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authorHans Wennborg <hans@hanshq.net>2018-02-22 13:24:27 +0000
committerHans Wennborg <hans@hanshq.net>2018-02-22 13:24:27 +0000
commit7449cddfd99b83cbcb61ec193a046ccb521996a0 (patch)
treecfff0e5775741e10622b8aeef6526c5fac77e5c0 /docs
parent5d413c4a80edad74d83341b0c2568ce0411ce829 (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
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@@ -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
-----------------------------