two simple testcases loopreduce should handle but does not yet currently

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22682 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/LoopStrengthReduce/exit_compare_live_range.ll b/test/Transforms/LoopStrengthReduce/exit_compare_live_range.ll
new file mode 100644 (file)
index 0000000..f60e7d6
--- /dev/null
+++ b/test/Transforms/LoopStrengthReduce/exit_compare_live_range.ll
@@ -0,0 +1,21 @@
+; Make sure that the compare instruction occurs after the increment to avoid
+; having overlapping live ranges that result in copies.  We want the setcc instruction
+; immediately before the conditional branch.
+;
+; RUN: llvm-as < %s | opt -loop-reduce | llvm-dis | %prcontext 'br bool' 1 | grep set
+; XFAIL: *
+
+void %foo(float* %D, uint %E) {
+entry:
+       br label %no_exit
+
+no_exit:
+       %indvar = phi uint [ 0, %entry ], [ %indvar.next, %no_exit ]
+       volatile store float 0.0, float* %D
+       %indvar.next = add uint %indvar, 1              ; <uint> [#uses=2]
+       %exitcond = seteq uint %indvar.next, %E         ; <bool> [#uses=1]
+       br bool %exitcond, label %loopexit, label %no_exit
+
+loopexit:
+       ret void
+}

diff --git a/test/Transforms/LoopStrengthReduce/related_indvars.ll b/test/Transforms/LoopStrengthReduce/related_indvars.ll
new file mode 100644 (file)
index 0000000..e331716
--- /dev/null
+++ b/test/Transforms/LoopStrengthReduce/related_indvars.ll
@@ -0,0 +1,29 @@
+; RUN: llvm-as < %s | opt -loop-reduce | llvm-dis | grep phi | wc -l | grep 1
+
+; This should only result in one PHI node!
+; XFAIL: *
+
+; void foo(double *D, double *E, double F) {
+;   while (D != E)
+;     *D++ = F;
+; }
+
+void %foo(double* %D, double* %E, double %F) {
+entry:
+       %tmp.24 = seteq double* %D, %E          ; <bool> [#uses=1]
+       br bool %tmp.24, label %return, label %no_exit
+
+no_exit:               ; preds = %no_exit, %entry
+       %indvar = phi uint [ 0, %entry ], [ %indvar.next, %no_exit ]            ; <uint> [#uses=3]
+       %D_addr.0.0.rec = cast uint %indvar to int              ; <int> [#uses=1]
+       %D_addr.0.0 = getelementptr double* %D, uint %indvar            ; <double*> [#uses=1]
+       %inc.rec = add int %D_addr.0.0.rec, 1           ; <int> [#uses=1]
+       %inc = getelementptr double* %D, int %inc.rec           ; <double*> [#uses=1]
+       store double %F, double* %D_addr.0.0
+       %tmp.2 = seteq double* %inc, %E         ; <bool> [#uses=1]
+       %indvar.next = add uint %indvar, 1              ; <uint> [#uses=1]
+       br bool %tmp.2, label %return, label %no_exit
+
+return:                ; preds = %no_exit, %entry
+       ret void
+}