1 files changed, 39 insertions, 0 deletions
diff --git a/test/CodeGen/AArch64/eliminate-trunc.ll b/test/CodeGen/AArch64/eliminate-trunc.ll
new file mode 100644
index 0000000..ea86a08
--- /dev/null
+++ b/test/CodeGen/AArch64/eliminate-trunc.ll
@@ -0,0 +1,39 @@
+; RUN: llc -verify-machineinstrs -o - %s -mtriple=aarch64-none-apple-ios7.0 -mcpu=cyclone | FileCheck %s
+
+; Check  trunc i64 operation is translated as a subregister access
+; eliminating an i32 induction varible.
+
+; CHECK-NOT: add {{x[0-9]+}}, {{x[0-9]+}}, #1
+; CHECK: add {{w[0-9]+}}, {{w[0-9]+}}, #1
+; CHECK-NEXT: cmp {{w[0-9]+}}, {{w[0-9]+}}
+define void @test1_signed([8 x i8]* nocapture %a, i8* nocapture readonly %box, i8 %limit) minsize {
+entry:
+  %conv = zext i8 %limit to i32
+  %cmp223 = icmp eq i8 %limit, 0
+  br i1 %cmp223, label %for.end15, label %for.body4.lr.ph.us
+
+for.body4.us:
+  %indvars.iv = phi i64 [ 0, %for.body4.lr.ph.us ], [ %indvars.iv.next, %for.body4.us ]
+  %arrayidx6.us = getelementptr inbounds [8 x i8]* %a, i64 %indvars.iv26, i64 %indvars.iv
+  %0 = load i8* %arrayidx6.us, align 1
+  %idxprom7.us = zext i8 %0 to i64
+  %arrayidx8.us = getelementptr inbounds i8* %box, i64 %idxprom7.us
+  %1 = load i8* %arrayidx8.us, align 1
+  store i8 %1, i8* %arrayidx6.us, align 1
+  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
+  %2 = trunc i64 %indvars.iv.next to i32
+  %cmp2.us = icmp slt i32 %2, %conv
+  br i1 %cmp2.us, label %for.body4.us, label %for.cond1.for.inc13_crit_edge.us
+
+for.body4.lr.ph.us:
+  %indvars.iv26 = phi i64 [ %indvars.iv.next27, %for.cond1.for.inc13_crit_edge.us ], [ 0, %entry ]
+  br label %for.body4.us
+
+for.cond1.for.inc13_crit_edge.us:
+  %indvars.iv.next27 = add nuw nsw i64 %indvars.iv26, 1
+  %exitcond28 = icmp eq i64 %indvars.iv26, 3
+  br i1 %exitcond28, label %for.end15, label %for.body4.lr.ph.us
+
+for.end15:
+  ret void
+}