fix PR6623: when optimizing for size, don't inline memcpy/memsets
that are too large. This causes the freebsd bootloader to be too
large apparently.
It's unclear if this should be an -Os or -Oz thing. Thoughts welcome.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105228 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 86e00ce..c1b5ec2 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -3266,6 +3266,15 @@
if (VT.bitsGT(LVT))
VT = LVT;
}
+
+ // If we're optimizing for size, and there is a limit, bump the maximum number
+ // of operations inserted down to 4. This is a wild guess that approximates
+ // the size of a call to memcpy or memset (3 arguments + call).
+ if (Limit != ~0U) {
+ const Function *F = DAG.getMachineFunction().getFunction();
+ if (F->hasFnAttr(Attribute::OptimizeForSize))
+ Limit = 4;
+ }
unsigned NumMemOps = 0;
while (Size != 0) {