2 files changed, 9 insertions, 0 deletions
diff --git a/llvm/lib/Target/AArch64/AArch64FastISel.cpp b/llvm/lib/Target/AArch64/AArch64FastISel.cpp
index 371accb5829..d80f34ca2d3 100644
--- a/llvm/lib/Target/AArch64/AArch64FastISel.cpp
+++ b/llvm/lib/Target/AArch64/AArch64FastISel.cpp
@@ -1280,6 +1280,10 @@ bool AArch64FastISel::ProcessCallArgs(CallLoweringInfo &CLI,
     } else {
       assert(VA.isMemLoc() && "Assuming store on stack.");
 
+      // Don't emit stores for undef values.
+      if (isa<UndefValue>(ArgVal))
+        continue;
+
       // Need to store on the stack.
       unsigned ArgSize = (ArgVT.getSizeInBits() + 7) / 8;
 
diff --git a/llvm/lib/Target/X86/X86FastISel.cpp b/llvm/lib/Target/X86/X86FastISel.cpp
index 52e65670a50..0938eda9dad 100644
--- a/llvm/lib/Target/X86/X86FastISel.cpp
+++ b/llvm/lib/Target/X86/X86FastISel.cpp
@@ -2831,6 +2831,11 @@ bool X86FastISel::FastLowerCall(CallLoweringInfo &CLI) {
       OutRegs.push_back(VA.getLocReg());
     } else {
       assert(VA.isMemLoc());
+
+      // Don't emit stores for undef values.
+      if (isa<UndefValue>(ArgVal))
+        continue;
+
       unsigned LocMemOffset = VA.getLocMemOffset();
       X86AddressMode AM;
       AM.Base.Reg = RegInfo->getStackRegister();