Implement initial support for return values from call instructions
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4924 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/InstSelectSimple.cpp b/lib/Target/X86/InstSelectSimple.cpp
index 55bf65b..2f701ed 100644
--- a/lib/Target/X86/InstSelectSimple.cpp
+++ b/lib/Target/X86/InstSelectSimple.cpp
@@ -430,6 +430,20 @@
// Adjust the stack by `bytesPushed' amount if non-zero
if (bytesPushed > 0)
BuildMI (BB, X86::ADDri32, 2).addReg(X86::ESP).addZImm(bytesPushed);
+
+ // If there is a return value, scavenge the result from the location the call
+ // leaves it in...
+ //
+ switch (getClass(CI.getType())) {
+ case cInt:
+ BuildMI(BB, X86::MOVrr32, 1, getReg(CI)).addReg(X86::EAX);
+ break;
+
+ default:
+ std::cerr << "Cannot get return value for call of type '"
+ << *CI.getType() << "'\n";
+ visitInstruction(CI);
+ }
}
/// visitSimpleBinary - Implement simple binary operators for integral types...