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

The code fix for this was checked in at r269797. llvm-svn: 269803
2016-05-17 19:25:55 +00:00 · 2016-05-17 19:25:55 +00:00 · de96f39392
parent c6e0502997
commit de96f39392
1 changed files with 12 additions and 0 deletions
--- a/llvm/test/Transforms/InstCombine/icmp.ll
+++ b/llvm/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
+}
+