CallingConv::ID CallerCC = CallerF->getCallingConv();
bool CCMatch = CallerCC == CalleeCC;
+ // Disable tailcall for CXX_FAST_TLS when callee and caller have different
+ // calling conventions, given that CXX_FAST_TLS has a bigger CSR set.
+ if (!CCMatch &&
+ (CallerCC == CallingConv::CXX_FAST_TLS ||
+ CalleeCC == CallingConv::CXX_FAST_TLS))
+ return false;
+
// Byval parameters hand the function a pointer directly into the stack area
// we want to reuse during a tail call. Working around this *is* possible (see
// X86) but less efficient and uglier in LowerCall.
CallingConv::ID CallerCC = CallerF->getCallingConv();
bool CCMatch = CallerCC == CalleeCC;
+ // Disable tailcall for CXX_FAST_TLS when callee and caller have different
+ // calling conventions, given that CXX_FAST_TLS has a bigger CSR set.
+ if (!CCMatch &&
+ (CallerCC == CallingConv::CXX_FAST_TLS ||
+ CalleeCC == CallingConv::CXX_FAST_TLS))
+ return false;
+
assert(Subtarget->supportsTailCall());
// Look for obvious safe cases to perform tail call optimization that do not
if (IsCalleeWin64 != IsCallerWin64)
return false;
+ // Disable tailcall for CXX_FAST_TLS when callee and caller have different
+ // calling conventions, given that CXX_FAST_TLS has a bigger CSR set.
+ if (!CCMatch &&
+ (CallerCC == CallingConv::CXX_FAST_TLS ||
+ CalleeCC == CallingConv::CXX_FAST_TLS))
+ return false;
+
if (DAG.getTarget().Options.GuaranteedTailCallOpt) {
if (canGuaranteeTCO(CalleeCC) && CCMatch)
return true;
call cxx_fast_tlscc void @tls_helper()
ret %class.C* @tC
}
+
+; Make sure we do not allow tail call when caller and callee have different
+; calling conventions.
+declare %class.C* @_ZN1CD1Ev(%class.C* readnone returned %this)
+; CHECK-LABEL: tls_test
+; CHECK: bl __tlv_atexit
+define cxx_fast_tlscc void @__tls_test() {
+entry:
+ store i32 0, i32* getelementptr inbounds (%class.C, %class.C* @tC, i64 0, i32 0), align 4
+ %0 = tail call i32 @_tlv_atexit(void (i8*)* bitcast (%class.C* (%class.C*)* @_ZN1CD1Ev to void (i8*)*), i8* bitcast (%class.C* @tC to i8*), i8* nonnull @__dso_handle) #1
+ ret void
+}
+
attributes #0 = { nounwind "no-frame-pointer-elim"="true" }
attributes #1 = { nounwind }
call cxx_fast_tlscc void @tls_helper()
ret %class.C* @tC
}
+
+; Make sure we do not allow tail call when caller and callee have different
+; calling conventions.
+declare %class.C* @_ZN1CD1Ev(%class.C* readnone returned %this)
+; CHECK-LABEL: tls_test
+; CHECK: bl __tlv_atexit
+define cxx_fast_tlscc void @__tls_test() {
+entry:
+ store i32 0, i32* getelementptr inbounds (%class.C, %class.C* @tC, i64 0, i32 0), align 4
+ %0 = tail call i32 @_tlv_atexit(void (i8*)* bitcast (%class.C* (%class.C*)* @_ZN1CD1Ev to void (i8*)*), i8* bitcast (%class.C* @tC to i8*), i8* nonnull @__dso_handle) #1
+ ret void
+}
+
attributes #0 = { nounwind "no-frame-pointer-elim"="true" }
attributes #1 = { nounwind }
call cxx_fast_tlscc void @tls_helper()
ret %class.C* @tC
}
+
+; Make sure we do not allow tail call when caller and callee have different
+; calling conventions.
+declare %class.C* @_ZN1CD1Ev(%class.C* readnone returned %this)
+; CHECK-LABEL: tls_test
+; CHECK: callq {{.*}}tlv_atexit
+define cxx_fast_tlscc void @tls_test() {
+entry:
+ store i32 0, i32* getelementptr inbounds (%class.C, %class.C* @tC, i64 0, i32 0), align 4
+ %0 = tail call i32 @_tlv_atexit(void (i8*)* bitcast (%class.C* (%class.C*)* @_ZN1CD1Ev to void (i8*)*), i8* bitcast (%class.C* @tC to i8*), i8* nonnull @__dso_handle) #1
+ ret void
+}
+
attributes #0 = { nounwind "no-frame-pointer-elim"="true" }
attributes #1 = { nounwind }