Another test case for PR1271 where bad shift masks were generated.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35372 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/InstCombine/2007-03-26-BadShiftMask.ll b/test/Transforms/InstCombine/2007-03-26-BadShiftMask.ll
new file mode 100644 (file)
index 0000000..c63fe8d
--- /dev/null
+++ b/test/Transforms/InstCombine/2007-03-26-BadShiftMask.ll
@@ -0,0 +1,35 @@
+; PR1271
+; RUN: llvm-as < %s | opt -instcombine | llvm-dis | \
+; RUN:    grep 'ashr i32 %.mp137, 2'
+target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64"
+target triple = "i686-pc-linux-gnu"
+
+implementation   ; Functions:
+
+define i1 @test(i32* %tmp141, i32* %tmp145, 
+            i32 %b8, i32 %iftmp.430.0, i32* %tmp134.out, i32* %tmp137.out)
+{
+newFuncRoot:
+       %tmp133 = and i32 %b8, 1                ; <i32> [#uses=1]
+       %tmp134 = shl i32 %tmp133, 3            ; <i32> [#uses=3]
+       %tmp136 = ashr i32 %b8, 1               ; <i32> [#uses=1]
+       %tmp137 = shl i32 %tmp136, 3            ; <i32> [#uses=3]
+       %tmp139 = ashr i32 %tmp134, 2           ; <i32> [#uses=1]
+       store i32 %tmp139, i32* %tmp141
+       %tmp143 = ashr i32 %tmp137, 2           ; <i32> [#uses=1]
+       store i32 %tmp143, i32* %tmp145
+       icmp eq i32 %iftmp.430.0, 0             ; <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_true147.exitStub, label %cond_false252.exitStub
+
+cond_true147.exitStub:         ; preds = %newFuncRoot
+       store i32 %tmp134, i32* %tmp134.out
+       store i32 %tmp137, i32* %tmp137.out
+       ret i1 true
+
+cond_false252.exitStub:                ; preds = %newFuncRoot
+       store i32 %tmp134, i32* %tmp134.out
+       store i32 %tmp137, i32* %tmp137.out
+       ret i1 false
+}