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

turn into a C predecrement operator.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22438 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/CBackend/2005-07-14-NegationToMinusMinus.ll b/test/CodeGen/CBackend/2005-07-14-NegationToMinusMinus.ll
new file mode 100644 (file)
index 0000000..9880456
--- /dev/null
+++ b/test/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
+}