From 7449cddfd99b83cbcb61ec193a046ccb521996a0 Mon Sep 17 00:00:00 2001 From: Hans Wennborg Date: Thu, 22 Feb 2018 13:24:27 +0000 Subject: 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 --- docs/ReleaseNotes.rst | 9 +++++++++ 1 file changed, 9 insertions(+) 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 ----------------------------- -- cgit v1.2.3