Convert -indvars tests that rely on SCEV expansion to -loop-reduce tests.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153259 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 124 insertions, 0 deletions

diff --git a/test/Transforms/LoopStrengthReduce/addrec-gep.ll b/test/Transforms/LoopStrengthReduce/addrec-gep.ll
new file mode 100644
index 0000000000..3e4e369657
--- /dev/null
+++ b/test/Transforms/LoopStrengthReduce/addrec-gep.ll
@@ -0,0 +1,82 @@
+; RUN: opt < %s -loop-reduce -S | FileCheck %s
+; CHECK: bb1:
+; CHECK: load double* [[IV:%[^,]+]]
+; CHECK: store double {{.*}}, double* [[IV]]
+; CHECK: getelementptr double*
+; CHECK-NOT: cast
+; CHECK: br {{.*}} label %bb1
+
+; This test tests several things. The load and store should use the
+; same address instead of having it computed twice, and SCEVExpander should
+; be able to reconstruct the full getelementptr, despite it having a few
+; obstacles set in its way.
+; We only check that the inner loop (bb1-bb2) is "reduced" because LSR
+; currently only operates on inner loops.
+
+target datalayout = "e-p:64:64:64-n32:64"
+
+define void @foo(i64 %n, i64 %m, i64 %o, i64 %q, double* nocapture %p) nounwind {
+entry:
+	%tmp = icmp sgt i64 %n, 0		; <i1> [#uses=1]
+	br i1 %tmp, label %bb.nph3, label %return
+
+bb.nph:		; preds = %bb2.preheader
+	%tmp1 = mul i64 %tmp16, %i.02		; <i64> [#uses=1]
+	%tmp2 = mul i64 %tmp19, %i.02		; <i64> [#uses=1]
+	br label %bb1
+
+bb1:		; preds = %bb2, %bb.nph
+	%j.01 = phi i64 [ %tmp9, %bb2 ], [ 0, %bb.nph ]		; <i64> [#uses=3]
+	%tmp3 = add i64 %j.01, %tmp1		; <i64> [#uses=1]
+	%tmp4 = add i64 %j.01, %tmp2		; <i64> [#uses=1]
+        %z0 = add i64 %tmp3, 5203
+	%tmp5 = getelementptr double* %p, i64 %z0		; <double*> [#uses=1]
+	%tmp6 = load double* %tmp5, align 8		; <double> [#uses=1]
+	%tmp7 = fdiv double %tmp6, 2.100000e+00		; <double> [#uses=1]
+        %z1 = add i64 %tmp4, 5203
+	%tmp8 = getelementptr double* %p, i64 %z1		; <double*> [#uses=1]
+	store double %tmp7, double* %tmp8, align 8
+	%tmp9 = add i64 %j.01, 1		; <i64> [#uses=2]
+	br label %bb2
+
+bb2:		; preds = %bb1
+	%tmp10 = icmp slt i64 %tmp9, %m		; <i1> [#uses=1]
+	br i1 %tmp10, label %bb1, label %bb2.bb3_crit_edge
+
+bb2.bb3_crit_edge:		; preds = %bb2
+	br label %bb3
+
+bb3:		; preds = %bb2.preheader, %bb2.bb3_crit_edge
+	%tmp11 = add i64 %i.02, 1		; <i64> [#uses=2]
+	br label %bb4
+
+bb4:		; preds = %bb3
+	%tmp12 = icmp slt i64 %tmp11, %n		; <i1> [#uses=1]
+	br i1 %tmp12, label %bb2.preheader, label %bb4.return_crit_edge
+
+bb4.return_crit_edge:		; preds = %bb4
+	br label %bb4.return_crit_edge.split
+
+bb4.return_crit_edge.split:		; preds = %bb.nph3, %bb4.return_crit_edge
+	br label %return
+
+bb.nph3:		; preds = %entry
+	%tmp13 = icmp sgt i64 %m, 0		; <i1> [#uses=1]
+	%tmp14 = mul i64 %n, 37		; <i64> [#uses=1]
+	%tmp15 = mul i64 %tmp14, %o		; <i64> [#uses=1]
+	%tmp16 = mul i64 %tmp15, %q		; <i64> [#uses=1]
+	%tmp17 = mul i64 %n, 37		; <i64> [#uses=1]
+	%tmp18 = mul i64 %tmp17, %o		; <i64> [#uses=1]
+	%tmp19 = mul i64 %tmp18, %q		; <i64> [#uses=1]
+	br i1 %tmp13, label %bb.nph3.split, label %bb4.return_crit_edge.split
+
+bb.nph3.split:		; preds = %bb.nph3
+	br label %bb2.preheader
+
+bb2.preheader:		; preds = %bb.nph3.split, %bb4
+	%i.02 = phi i64 [ %tmp11, %bb4 ], [ 0, %bb.nph3.split ]		; <i64> [#uses=3]
+	br i1 true, label %bb.nph, label %bb3
+
+return:		; preds = %bb4.return_crit_edge.split, %entry
+	ret void
+}
diff --git a/test/Transforms/LoopStrengthReduce/preserve-gep-loop-variant.ll b/test/Transforms/LoopStrengthReduce/preserve-gep-loop-variant.ll
new file mode 100644
index 0000000000..f90d030800
--- /dev/null
+++ b/test/Transforms/LoopStrengthReduce/preserve-gep-loop-variant.ll
@@ -0,0 +1,42 @@
+; RUN: opt < %s -loop-reduce -S | FileCheck %s
+; CHECK-NOT: {{inttoptr|ptrtoint}}
+; CHECK: scevgep
+; CHECK-NOT: {{inttoptr|ptrtoint}}
+target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128-n32:64"
+
+; Indvars shouldn't need inttoptr/ptrtoint to expand an address here.
+
+define void @foo(i8* %p) nounwind {
+entry:
+  br i1 true, label %bb.nph, label %for.end
+
+for.cond:
+  %phitmp = icmp slt i64 %inc, 20
+  br i1 %phitmp, label %for.body, label %for.cond.for.end_crit_edge
+
+for.cond.for.end_crit_edge:
+  br label %for.end
+
+bb.nph:
+  br label %for.body
+
+for.body:
+  %storemerge1 = phi i64 [ %inc, %for.cond ], [ 0, %bb.nph ]
+  %call = tail call i64 @bar() nounwind
+  %call2 = tail call i64 @car() nounwind
+  %conv = trunc i64 %call2 to i8
+  %conv3 = sext i8 %conv to i64
+  %add = add nsw i64 %call, %storemerge1
+  %add4 = add nsw i64 %add, %conv3
+  %arrayidx = getelementptr inbounds i8* %p, i64 %add4
+  store i8 0, i8* %arrayidx
+  %inc = add nsw i64 %storemerge1, 1
+  br label %for.cond
+
+for.end:
+  ret void
+}
+
+declare i64 @bar()
+
+declare i64 @car()