[llvm-branch-commits] [llvm-branch] r325776 - ReleaseNotes: The fast-math-flags changes
Hans Wennborg via llvm-branch-commits
llvm-branch-commits at lists.llvm.org
Thu Feb 22 05:24:28 PST 2018
Author: hans
Date: Thu Feb 22 05:24:27 2018
New Revision: 325776
URL: http://llvm.org/viewvc/llvm-project?rev=325776&view=rev
Log:
ReleaseNotes: The fast-math-flags changes
By Sanjay Patel!
Modified:
llvm/branches/release_60/docs/ReleaseNotes.rst
Modified: llvm/branches/release_60/docs/ReleaseNotes.rst
URL: http://llvm.org/viewvc/llvm-project/llvm/branches/release_60/docs/ReleaseNotes.rst?rev=325776&r1=325775&r2=325776&view=diff
==============================================================================
--- llvm/branches/release_60/docs/ReleaseNotes.rst (original)
+++ llvm/branches/release_60/docs/ReleaseNotes.rst Thu Feb 22 05:24:27 2018
@@ -74,6 +74,15 @@ Non-comprehensive list of changes in thi
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
-----------------------------
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