Regression test for PR#596: Make sure that negation of a minus doesn't

turn into a C predecrement operator.

llvm-svn: 22438

llvm/test/Regression/CodeGen/CBackend/2005-07-14-NegationToMinusMinus.ll

@@ -0,0 +1,19 @@
+; RUN: llvm-as < %s | llc -march=c | not grep "\-\-65535"
+; ModuleID = '<stdin>'
+target endian = little
+target pointersize = 32
+target triple = "i686-pc-linux-gnu"
+
+implementation   ; Functions:
+
+declare void %func(int)
+
+void %funcb() {
+entry:
+	%tmp.1 = sub int 0, -65535		; <int> [#uses=1]
+	call void %func( int %tmp.1 )
+	br label %return
+
+return:		; preds = %entry
+	ret void
+}