new testcase miscompiled by instcombine

llvm-svn: 28018
2006-04-28 22:17:20 +00:00 · 2006-04-28 22:17:20 +00:00 · 00aaa76da3
parent 84b49d51be
commit 00aaa76da3
1 changed files with 10 additions and 0 deletions
--- a/llvm/test/Regression/Transforms/InstCombine/2006-04-28-ShiftShiftLongLong.ll
+++ b/llvm/test/Regression/Transforms/InstCombine/2006-04-28-ShiftShiftLongLong.ll
@ -0,0 +1,10 @@
+; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep shl &&
+; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep cast
+
+; This cannot be turned into a sign extending cast!
+
+long %test(long %X) {
+	%Y = shl long %X, ubyte 16
+	%Z = shr long %Y, ubyte 16
+	ret long %Z
+}