[InstCombine] replace test that no longer works as intended

This is step 1 of refactoring to solve PR26760:
https://llvm.org/bugs/show_bug.cgi?id=26760

llvm-svn: 265946

1 files changed, 22 insertions, 0 deletions

diff --git a/llvm/test/Transforms/InstCombine/shift-shift.ll b/llvm/test/Transforms/InstCombine/shift-shift.ll
new file mode 100644
index 00000000000..23a45e0967f
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/shift-shift.ll
@@ -0,0 +1,22 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+; This would crash if we didn't check for a negative shift.
+
+define void @pr12967() {
+; CHECK-LABEL: @pr12967(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br label %loop
+; CHECK:       loop:
+; CHECK-NEXT:    br label %loop
+;
+entry:
+  br label %loop
+
+loop:
+  %c = phi i32 [ %shl, %loop ], [ undef, %entry ]
+  %shr = shl i32 %c, 7
+  %shl = lshr i32 %shr, -2
+  br label %loop
+}
+