Merge 64364 from mainline.

Fix a nasty bug (PR3550) where the inline pass could incorrectly mark 
calls with the tail marker when inlining them through an invoke.  Patch,
testcase, and perfect analysis by Jay Foad!

llvm-svn: 64520

Author: tlattner

llvm/lib/Transforms/Utils/InlineFunction.cpp

@@ -203,10 +203,10 @@ bool llvm::InlineFunction(CallSite CS, CallGraph *CG, const TargetData *TD) {
       CalledFunc->getFunctionType()->isVarArg()) return false;
 
 
-  // If the call to the callee is a non-tail call, we must clear the 'tail'
+  // If the call to the callee is not a tail call, we must clear the 'tail'
   // flags on any calls that we inline.
   bool MustClearTailCallFlags =
-    isa<CallInst>(TheCall) && !cast<CallInst>(TheCall)->isTailCall();
+    !(isa<CallInst>(TheCall) && cast<CallInst>(TheCall)->isTailCall());
 
   // If the call to the callee cannot throw, set the 'nounwind' flag on any
   // calls that we inline.

llvm/test/Transforms/Inline/inline-invoke-tail.ll

@@ -0,0 +1,35 @@
+; RUN: llvm-as < %s | opt -inline | llvm-dis | not grep {tail call void @llvm.memcpy.i32}
+; PR3550
+
+define internal void @foo(i32* %p, i32* %q) {
+	%pp = bitcast i32* %p to i8*
+	%qq = bitcast i32* %q to i8*
+	tail call void @llvm.memcpy.i32(i8* %pp, i8* %qq, i32 4, i32 1)
+	ret void
+}
+
+declare void @llvm.memcpy.i32(i8* nocapture, i8* nocapture, i32, i32) nounwind
+
+define i32 @main() {
+	%a = alloca i32		; <i32*> [#uses=3]
+	%b = alloca i32		; <i32*> [#uses=2]
+	store i32 1, i32* %a, align 4
+	store i32 0, i32* %b, align 4
+	invoke void @foo(i32* %a, i32* %b)
+			to label %invcont unwind label %lpad
+
+invcont:
+	%retval = load i32* %a, align 4
+	ret i32 %retval
+
+lpad:
+	%eh_ptr = call i8* @llvm.eh.exception()
+	%eh_select = call i32 (i8*, i8*, ...)* @llvm.eh.selector.i32(i8* %eh_ptr, i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*), i8* null)
+	unreachable
+}
+
+declare i8* @llvm.eh.exception() nounwind
+
+declare i32 @llvm.eh.selector.i32(i8*, i8*, ...) nounwind
+
+declare i32 @__gxx_personality_v0(...)