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-rw-r--r--test/Transforms/IndVarSimplify/ult-sub-to-eq.ll42
1 files changed, 42 insertions, 0 deletions
diff --git a/test/Transforms/IndVarSimplify/ult-sub-to-eq.ll b/test/Transforms/IndVarSimplify/ult-sub-to-eq.ll
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+++ b/test/Transforms/IndVarSimplify/ult-sub-to-eq.ll
@@ -0,0 +1,42 @@
+; RUN: opt -S -indvars < %s | FileCheck %s
+
+define void @test1(float* nocapture %autoc, float* nocapture %data, float %d, i32 %data_len, i32 %sample) nounwind {
+entry:
+ %sub = sub i32 %data_len, %sample
+ %cmp4 = icmp eq i32 %data_len, %sample
+ br i1 %cmp4, label %for.end, label %for.body
+
+for.body: ; preds = %entry, %for.body
+ %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
+ %0 = trunc i64 %indvars.iv to i32
+ %add = add i32 %0, %sample
+ %idxprom = zext i32 %add to i64
+ %arrayidx = getelementptr inbounds float* %data, i64 %idxprom
+ %1 = load float* %arrayidx, align 4
+ %mul = fmul float %1, %d
+ %arrayidx2 = getelementptr inbounds float* %autoc, i64 %indvars.iv
+ %2 = load float* %arrayidx2, align 4
+ %add3 = fadd float %2, %mul
+ store float %add3, float* %arrayidx2, align 4
+ %indvars.iv.next = add i64 %indvars.iv, 1
+ %3 = trunc i64 %indvars.iv.next to i32
+ %cmp = icmp ult i32 %3, %sub
+ br i1 %cmp, label %for.body, label %for.end
+
+for.end: ; preds = %for.body, %entry
+ ret void
+
+; CHECK: @test1
+
+; First check that we move the sub into the preheader, it doesn't have to be
+; executed if %cmp4 == false
+; CHECK: for.body.preheader:
+; CHECK: sub i32 %data_len, %sample
+; CHECK: br label %for.body
+
+; Second, check that we turn the IV test into an eq.
+; CHECK: %lftr.wideiv = trunc i64 %indvars.iv.next to i32
+; CHECK: %exitcond = icmp ne i32 %lftr.wideiv, %0
+; CHECK: br i1 %exitcond, label %for.body, label %for.end.loopexit
+}
+