Do not fold loads into instructions if it is used more than once. In particular
we do not want to fold the load in cases like this:
X = load
= add A, X
= add B, X
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14204 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/InstSelectSimple.cpp b/lib/Target/X86/InstSelectSimple.cpp
index 0c8b0a4..598a979 100644
--- a/lib/Target/X86/InstSelectSimple.cpp
+++ b/lib/Target/X86/InstSelectSimple.cpp
@@ -1964,11 +1964,12 @@
// Special case: op Reg, load [mem]
if (isa<LoadInst>(Op0) && !isa<LoadInst>(Op1) && Class != cLong &&
+ Op0->hasOneUse() &&
isSafeToFoldLoadIntoInstruction(*cast<LoadInst>(Op0), B))
if (!B.swapOperands())
std::swap(Op0, Op1); // Make sure any loads are in the RHS.
- if (isa<LoadInst>(Op1) && Class != cLong &&
+ if (isa<LoadInst>(Op1) && Class != cLong && Op1->hasOneUse() &&
isSafeToFoldLoadIntoInstruction(*cast<LoadInst>(Op1), B)) {
unsigned Opcode;