[Git][ghc/ghc][wip/andreask/aarch_fma] Aarch64: Enable -mfma by default.

[Andreas Klebinger (@AndreasK)]

Andreas Klebinger pushed to branch wip/andreask/aarch_fma at Glasgow Haskell Compiler / GHC


Commits:
5ebac014 by Andreas Klebinger at 2024-01-11T15:10:44+01:00
Aarch64: Enable -mfma by default.

Fixes #24311

- - - - -


2 changed files:

- compiler/GHC/Driver/DynFlags.hs
- docs/users_guide/using.rst


Changes:

=====================================
compiler/GHC/Driver/DynFlags.hs
=====================================
@@ -699,7 +699,8 @@ defaultDynFlags mySettings =
         avx512er = False,
         avx512f = False,
         avx512pf = False,
-        fma = False,
+        -- Use FMA by default on AArch64
+        fma = (platformArch . sTargetPlatform $ mySettings) == ArchAArch64,
 
         maxInlineAllocSize = 128,
         maxInlineMemcpyInsns = 32,


=====================================
docs/users_guide/using.rst
=====================================
@@ -1415,7 +1415,7 @@ messages and in GHCi:
 
     The structure of the output is described by a `JSON Schema <https://json-schema.org/>`_.
     The schema can be downloaded :download:`here <diagnostics-as-json-schema-1_0.json>`.
-    
+
 .. ghc-flag:: -fdiagnostics-color=⟨always|auto|never⟩
     :shortdesc: Use colors in error messages
     :type: dynamic
@@ -1761,6 +1761,8 @@ Some flags only make sense for particular target platforms.
     :type: dynamic
     :category: platform-options
 
+    :default: off by default, except for Aarch64 where it's on by default.
+
     :since: 9.8.1
 
     Use native FMA instructions to implement the fused multiply-add floating-point



View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/5ebac0143686d56b5d57a372a2b859159bb48e89

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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/5ebac0143686d56b5d57a372a2b859159bb48e89
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