Author: Armin Rigo <[email protected]>
Branch: c7-refactor
Changeset: r777:b5c61f587a33
Date: 2014-02-19 09:44 +0100
http://bitbucket.org/pypy/stmgc/changeset/b5c61f587a33/
Log: Add an LLVM patch. It might not be needed on simple examples, but I
fear that it will be needed to compile large programs.
diff --git a/c7/llvmfix/no-memset-creation-with-addrspace.diff
b/c7/llvmfix/no-memset-creation-with-addrspace.diff
new file mode 100644
--- /dev/null
+++ b/c7/llvmfix/no-memset-creation-with-addrspace.diff
@@ -0,0 +1,16 @@
+Index: lib/Transforms/Scalar/MemCpyOptimizer.cpp
+===================================================================
+--- lib/Transforms/Scalar/MemCpyOptimizer.cpp (revision 201645)
++++ lib/Transforms/Scalar/MemCpyOptimizer.cpp (working copy)
+@@ -368,6 +368,11 @@
+ Value *StartPtr, Value *ByteVal)
{
+ if (TD == 0) return 0;
+
++ // We have to check for address space < 256, since llvm.memset only supports
++ // user defined address spaces.
++ if (cast<PointerType>(StartPtr->getType())->getAddressSpace() >= 256)
++ return 0;
++
+ // Okay, so we now have a single store that can be splatable. Scan to find
+ // all subsequent stores of the same value to offset from the same pointer.
+ // Join these together into ranges, so we can decide whether contiguous
blocks
diff --git a/c7/stm/core.h b/c7/stm/core.h
--- a/c7/stm/core.h
+++ b/c7/stm/core.h
@@ -123,6 +123,8 @@
static inline void _duck(void) {
/* put a call to _duck() between two instructions that set 0 into
a %gs-prefixed address and that may otherwise be replaced with
- llvm.memset --- it fails later because of the prefix... */
+ llvm.memset --- it fails later because of the prefix...
+ This is not needed any more after applying the patch
+ llvmfix/no-memset-creation-with-addrspace.diff. */
asm("/* workaround for llvm bug */");
}
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