[Git][ghc/ghc][wip/tsan/fixes-2] codeGen: More precise barriers for eager blackholing

[Ben Gamari (@bgamari)]

Ben Gamari pushed to branch wip/tsan/fixes-2 at Glasgow Haskell Compiler / GHC


Commits:
e10dfa47 by Ben Gamari at 2023-06-22T19:04:44-04:00
codeGen: More precise barriers for eager blackholing

- - - - -


1 changed file:

- compiler/GHC/StgToCmm/Bind.hs


Changes:

=====================================
compiler/GHC/StgToCmm/Bind.hs
=====================================
@@ -702,11 +702,11 @@ emitBlackHoleCode node = do
 
   when eager_blackholing $ do
     whenUpdRemSetEnabled $ emitUpdRemSetPushThunk node
-    emitAtomicStore platform MemOrderSeqCst
+    emitAtomicStore platform MemOrderRelease
         (cmmOffsetW platform node (fixedHdrSizeW profile))
         (currentTSOExpr platform)
     -- See Note [Heap memory barriers] in SMP.h.
-    emitAtomicStore platform MemOrderRelaxed
+    emitAtomicStore platform MemOrderRelease
         node
         (CmmReg (CmmGlobal $ GlobalRegUse EagerBlackholeInfo $ bWord platform))
 



View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/e10dfa4737d446b6cace5af9e0eefef689c4ca99

-- 
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/e10dfa4737d446b6cace5af9e0eefef689c4ca99
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