Author: Armin Rigo <[email protected]>
Branch:
Changeset: r1062:57aa8f49c843
Date: 2014-03-18 09:32 +0100
http://bitbucket.org/pypy/stmgc/changeset/57aa8f49c843/
Log: Add a README for the llvmfix directory
diff --git a/c7/llvmfix/README.txt b/c7/llvmfix/README.txt
new file mode 100644
--- /dev/null
+++ b/c7/llvmfix/README.txt
@@ -0,0 +1,24 @@
+
+no-introduce-bogus-cast-in-combine.diff
+
+ This is just fixes for a couple of bugs.
+
+
+no-memset-creation-with-addrspace.diff
+
+ This is a workaround for the fact that llvm.memset doesn't support
+ the address_space 256. It's a workaround, because it also prevents
+ some useful optimizations: for example replacing "x->a = 0; x->b =
+ 0;" with a single larger zeroing instruction. In other words, it
+ crashes only if an unpatched llvm introduce llvm.memset *and* this
+ memset remains as a real function call in the end.
+
+
+addrspacecast-in-constant.diff
+
+ This is a workaround for (what we believe to be) clang producing
+ incorrectly the addrspacecast operation for this kind of code:
+
+ static __attribute__((address_space(256))) long a = 42;
+ struct s1 { void *a; };
+ struct s1 fofo = { (void *)(long)&a };
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