From: Reid Spencer <rspencer@reidspencer.com>
Date: Mon, 26 Mar 2007 05:32:16 +0000 (+0000)
Subject: Test case for PR1271 involving construction of a bad mask to replace a
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=c3a53f2720c6baf7fbc214a54e062ed517b732c3;p=oota-llvm.git

Test case for PR1271 involving construction of a bad mask to replace a
shift instruction.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35349 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/test/Transforms/InstCombine/2007-03-25-BadShiftMask.ll b/test/Transforms/InstCombine/2007-03-25-BadShiftMask.ll
new file mode 100644
index 00000000000..3a706a5686a
--- /dev/null
+++ b/test/Transforms/InstCombine/2007-03-25-BadShiftMask.ll
@@ -0,0 +1,28 @@
+; PR1271
+; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep 'br i1 %1'
+%struct..0anon = type { i32, i32 }
+%struct..1anon = type { double }
+
+define i32 @main() {
+entry:
+	%u = alloca %struct..1anon, align 8		; <%struct..1anon*> [#uses=4]
+	%tmp1 = getelementptr %struct..1anon* %u, i32 0, i32 0		; <double*> [#uses=1]
+	store double 0x7FF0000000000000, double* %tmp1
+	%tmp3 = getelementptr %struct..1anon* %u, i32 0, i32 0		; <double*> [#uses=1]
+	%tmp34 = bitcast double* %tmp3 to %struct..0anon*		; <%struct..0anon*> [#uses=1]
+	%tmp5 = getelementptr %struct..0anon* %tmp34, i32 0, i32 1		; <i32*> [#uses=1]
+	%tmp6 = load i32* %tmp5		; <i32> [#uses=1]
+	%tmp7 = shl i32 %tmp6, 1		; <i32> [#uses=1]
+	%tmp8 = lshr i32 %tmp7, 21		; <i32> [#uses=1]
+	%tmp89 = trunc i32 %tmp8 to i16		; <i16> [#uses=1]
+	icmp ne i16 %tmp89, 2047		; <i1>:0 [#uses=1]
+	zext i1 %0 to i8		; <i8>:1 [#uses=1]
+	icmp ne i8 %1, 0		; <i1>:2 [#uses=1]
+	br i1 %2, label %cond_true, label %cond_false
+
+cond_true:		; preds = %entry
+	ret i32 0
+
+cond_false:		; preds = %entry
+        ret i32 1
+}