new testcase

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24099 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/LoopStrengthReduce/nested-reduce.ll b/test/Transforms/LoopStrengthReduce/nested-reduce.ll
new file mode 100644 (file)
index 0000000..ebef2f0
--- /dev/null
+++ b/test/Transforms/LoopStrengthReduce/nested-reduce.ll
@@ -0,0 +1,57 @@
+; RUN: llvm-as < %s | opt -loop-reduce &&
+; RUN: llvm-as < %s | opt -loop-reduce | llvm-dis | not grep mul
+
+; Make sure we don't get a multiply by 6 in this loop.
+
+int %foo(int %A, int %B, int %C, int %D) {
+entry:
+       %tmp.5 = setgt int %C, 0                ; <bool> [#uses=1]
+       %tmp.25 = and int %A, 1         ; <int> [#uses=1]
+       br label %loopentry.1
+
+loopentry.1:           ; preds = %loopexit.1, %entry
+       %indvar20 = phi uint [ 0, %entry ], [ %indvar.next21, %loopexit.1 ]             ; <uint> [#uses=2]
+       %k.1 = phi int [ 0, %entry ], [ %k.1.3, %loopexit.1 ]           ; <int> [#uses=2]
+       br bool %tmp.5, label %no_exit.1.preheader, label %loopexit.1
+
+no_exit.1.preheader:           ; preds = %loopentry.1
+       %i.0.0 = cast uint %indvar20 to int             ; <int> [#uses=1]
+       %tmp.9 = mul int %i.0.0, 6              ; <int> [#uses=1]
+       br label %no_exit.1.outer
+
+no_exit.1.outer:               ; preds = %cond_true, %no_exit.1.preheader
+       %k.1.2.ph = phi int [ %k.1, %no_exit.1.preheader ], [ %k.09, %cond_true ]               ; <int> [#uses=2]
+       %j.1.2.ph = phi int [ 0, %no_exit.1.preheader ], [ %inc.1, %cond_true ]         ; <int> [#uses=1]
+       br label %no_exit.1
+
+no_exit.1:             ; preds = %cond_continue, %no_exit.1.outer
+       %indvar = phi uint [ 0, %no_exit.1.outer ], [ %indvar.next, %cond_continue ]            ; <uint> [#uses=2]
+       %indvar = cast uint %indvar to int              ; <int> [#uses=1]
+       %j.1.2 = add int %indvar, %j.1.2.ph             ; <int> [#uses=2]
+       %tmp.11 = add int %j.1.2, %tmp.9                ; <int> [#uses=1]
+       %tmp.12 = cast int %tmp.11 to ubyte             ; <ubyte> [#uses=1]
+       %tmp.13 = shl int %D, ubyte %tmp.12             ; <int> [#uses=2]
+       %tmp.15 = seteq int %tmp.13, %B         ; <bool> [#uses=1]
+       %inc.1 = add int %j.1.2, 1              ; <int> [#uses=3]
+       br bool %tmp.15, label %cond_true, label %cond_continue
+
+cond_true:             ; preds = %no_exit.1
+       %tmp.26 = and int %tmp.25, %tmp.13              ; <int> [#uses=1]
+       %k.09 = add int %tmp.26, %k.1.2.ph              ; <int> [#uses=2]
+       %tmp.517 = setlt int %inc.1, %C         ; <bool> [#uses=1]
+       br bool %tmp.517, label %no_exit.1.outer, label %loopexit.1
+
+cond_continue:         ; preds = %no_exit.1
+       %tmp.519 = setlt int %inc.1, %C         ; <bool> [#uses=1]
+       %indvar.next = add uint %indvar, 1              ; <uint> [#uses=1]
+       br bool %tmp.519, label %no_exit.1, label %loopexit.1
+
+loopexit.1:            ; preds = %cond_continue, %cond_true, %loopentry.1
+       %k.1.3 = phi int [ %k.1, %loopentry.1 ], [ %k.09, %cond_true ], [ %k.1.2.ph, %cond_continue ]           ; <int> [#uses=2]
+       %indvar.next21 = add uint %indvar20, 1          ; <uint> [#uses=2]
+       %exitcond = seteq uint %indvar.next21, 4                ; <bool> [#uses=1]
+       br bool %exitcond, label %loopexit.0, label %loopentry.1
+
+loopexit.0:            ; preds = %loopexit.1
+       ret int %k.1.3
+}