[InstCombine] add test for wrong icmp constant (PR27792)

The code fix for this was checked in at r269797.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@269803 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/InstCombine/icmp.ll b/test/Transforms/InstCombine/icmp.ll
index 24a539b..099d159 100644 (file)
--- a/test/Transforms/InstCombine/icmp.ll
+++ b/test/Transforms/InstCombine/icmp.ll
@@ -2097,3 +2097,15 @@ if.then3:                                         ; preds = %if.end
 return:                                           ; preds = %if.end, %entry, %if.then3
   ret void
 }
+
+; When canonicalizing to 'sgt', make sure the constant is correct.
+
+define i1 @PR27792(i128 %a) {
+; CHECK-LABEL: @PR27792(
+; CHECK-NEXT:    [[CMP:%.*]] = icmp sgt i128 %a, -1
+; CHECK-NEXT:    ret i1 [[CMP]]
+;
+  %cmp = icmp sge i128 %a, 0
+  ret i1 %cmp
+}
+