New Loop Distribution pass

[oota-llvm.git] / test / Transforms / LoopDistribute / basic-with-memchecks.ll

diff --git a/test/Transforms/LoopDistribute/basic-with-memchecks.ll b/test/Transforms/LoopDistribute/basic-with-memchecks.ll
new file mode 100644 (file)
index 0000000..4c1c1b8
--- /dev/null
+++ b/test/Transforms/LoopDistribute/basic-with-memchecks.ll
@@ -0,0 +1,112 @@
+; RUN: opt -basicaa -loop-distribute -verify-loop-info -verify-dom-info -S \
+; RUN:   < %s | FileCheck %s
+
+; RUN: opt -basicaa -loop-distribute -loop-vectorize -force-vector-width=4 \
+; RUN:   -verify-loop-info -verify-dom-info -S < %s | \
+; RUN:   FileCheck --check-prefix=VECTORIZE %s
+
+; The memcheck version of basic.ll.  We should distribute and vectorize the
+; second part of this loop with 5 memchecks (A+1 x {C, D, E} + C x {A, B})
+;
+;   for (i = 0; i < n; i++) {
+;     A[i + 1] = A[i] * B[i];
+; -------------------------------
+;     C[i] = D[i] * E[i];
+;   }
+
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx10.10.0"
+
+@B = common global i32* null, align 8
+@A = common global i32* null, align 8
+@C = common global i32* null, align 8
+@D = common global i32* null, align 8
+@E = common global i32* null, align 8
+
+define void @f() {
+entry:
+  %a = load i32*, i32** @A, align 8
+  %b = load i32*, i32** @B, align 8
+  %c = load i32*, i32** @C, align 8
+  %d = load i32*, i32** @D, align 8
+  %e = load i32*, i32** @E, align 8
+  br label %for.body
+
+; We have two compares for each array overlap check which is a total of 10
+; compares.
+;
+; CHECK: for.body.ldist.memcheck:
+; CHECK:     = icmp
+; CHECK:     = icmp
+
+; CHECK:     = icmp
+; CHECK:     = icmp
+
+; CHECK:     = icmp
+; CHECK:     = icmp
+
+; CHECK:     = icmp
+; CHECK:     = icmp
+
+; CHECK:     = icmp
+; CHECK:     = icmp
+
+; CHECK-NOT: = icmp
+; CHECK:     br i1 %memcheck.conflict, label %for.body.ph.ldist.nondist, label %for.body.ph.ldist1
+
+; The non-distributed loop that the memchecks fall back on.
+
+; CHECK: for.body.ph.ldist.nondist:
+; CHECK:     br label %for.body.ldist.nondist
+; CHECK: for.body.ldist.nondist:
+; CHECK:    br i1 %exitcond.ldist.nondist, label %for.end, label %for.body.ldist.nondist
+
+; Verify the two distributed loops.
+
+; CHECK: for.body.ph.ldist1:
+; CHECK:     br label %for.body.ldist1
+; CHECK: for.body.ldist1:
+; CHECK:    %mulA.ldist1 = mul i32 %loadB.ldist1, %loadA.ldist1
+; CHECK:    br i1 %exitcond.ldist1, label %for.body.ph, label %for.body.ldist1
+
+; CHECK: for.body.ph:
+; CHECK:    br label %for.body
+; CHECK: for.body:
+; CHECK:    %mulC = mul i32 %loadD, %loadE
+; CHECK: for.end:
+
+
+; VECTORIZE: mul <4 x i32>
+
+for.body:                                         ; preds = %for.body, %entry
+  %ind = phi i64 [ 0, %entry ], [ %add, %for.body ]
+
+  %arrayidxA = getelementptr inbounds i32, i32* %a, i64 %ind
+  %loadA = load i32, i32* %arrayidxA, align 4
+
+  %arrayidxB = getelementptr inbounds i32, i32* %b, i64 %ind
+  %loadB = load i32, i32* %arrayidxB, align 4
+
+  %mulA = mul i32 %loadB, %loadA
+
+  %add = add nuw nsw i64 %ind, 1
+  %arrayidxA_plus_4 = getelementptr inbounds i32, i32* %a, i64 %add
+  store i32 %mulA, i32* %arrayidxA_plus_4, align 4
+
+  %arrayidxD = getelementptr inbounds i32, i32* %d, i64 %ind
+  %loadD = load i32, i32* %arrayidxD, align 4
+
+  %arrayidxE = getelementptr inbounds i32, i32* %e, i64 %ind
+  %loadE = load i32, i32* %arrayidxE, align 4
+
+  %mulC = mul i32 %loadD, %loadE
+
+  %arrayidxC = getelementptr inbounds i32, i32* %c, i64 %ind
+  store i32 %mulC, i32* %arrayidxC, align 4
+
+  %exitcond = icmp eq i64 %add, 20
+  br i1 %exitcond, label %for.end, label %for.body
+
+for.end:                                          ; preds = %for.body
+  ret void
+}