Revision: 127367
Author: johannes
Date: 2007-05-17 16:47:22 -0700 (Thu, 17 May 2007)
Log Message:
-----------
Make ARM more aggressive about using target-dependent
memcpy expansion for aggregate copy.
Modified Paths:
--------------
apple-local/branches/llvm/gcc/config/arm/arm.h
apple-local/branches/llvm/gcc/llvm-convert.cpp
Modified: apple-local/branches/llvm/gcc/config/arm/arm.h
===================================================================
--- apple-local/branches/llvm/gcc/config/arm/arm.h 2007-05-17 21:04:42 UTC
(rev 127366)
+++ apple-local/branches/llvm/gcc/config/arm/arm.h 2007-05-17 23:47:22 UTC
(rev 127367)
@@ -2923,4 +2923,8 @@
#define LLVM_OVERRIDE_TARGET_ARCH() \
(TARGET_THUMB ? "thumb" : "")
+/* Doing struct copy by partial-word loads and stores is not a good idea on
ARM. */
+#define TARGET_LLVM_MIN_BYTES_COPY_BY_MEMCPY 4
+/* APPLE LOCAL end llvm */
+
#endif /* ! GCC_ARM_H */
Modified: apple-local/branches/llvm/gcc/llvm-convert.cpp
===================================================================
--- apple-local/branches/llvm/gcc/llvm-convert.cpp 2007-05-17 21:04:42 UTC
(rev 127366)
+++ apple-local/branches/llvm/gcc/llvm-convert.cpp 2007-05-17 23:47:22 UTC
(rev 127367)
@@ -1120,6 +1120,10 @@
}
}
+#ifndef TARGET_LLVM_MIN_BYTES_COPY_BY_MEMCPY
+#define TARGET_LLVM_MIN_BYTES_COPY_BY_MEMCPY 64
+#endif
+
/// EmitAggregateCopy - Copy the elements from SrcPtr to DestPtr, using the
/// GCC type specified by GCCType to know which elements to copy.
void TreeToLLVM::EmitAggregateCopy(Value *DestPtr, Value *SrcPtr, tree type,
@@ -1129,7 +1133,8 @@
// If the type is small, copy the elements instead of using a block copy.
if (TREE_CODE(TYPE_SIZE(type)) == INTEGER_CST &&
- TREE_INT_CST_LOW(TYPE_SIZE_UNIT(type)) < 64) {
+ TREE_INT_CST_LOW(TYPE_SIZE_UNIT(type)) <
+ TARGET_LLVM_MIN_BYTES_COPY_BY_MEMCPY) {
const Type *LLVMTy = ConvertType(type);
if (CountAggregateElements(LLVMTy) <= 8) {
DestPtr = CastToType(Instruction::BitCast, DestPtr,
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