1 files changed, 38 insertions, 0 deletions
diff --git a/test/CodeGen/X86/atom-fixup-lea1.ll b/test/CodeGen/X86/atom-fixup-lea1.ll
new file mode 100644
index 0000000..4651bf2
--- /dev/null
+++ b/test/CodeGen/X86/atom-fixup-lea1.ll
@@ -0,0 +1,38 @@
+; RUN: llc < %s -mcpu=atom -mtriple=i686-linux | FileCheck %s
+; CHECK: addl
+; CHECK-NEXT:leal
+; CHECK-NEXT:decl
+; CHECK-NEXT:jne
+
+; Test for the FixupLEAs pre-emit pass. An LEA should be substituted for the ADD
+; that increments the array pointer because it is within 5 instructions of the
+; corresponding load. The ADD precedes the load by following the loop back edge.
+
+; Original C code
+;int test(int n, int * array)
+;{
+;  int sum = 0;
+;  for(int i = 0; i < n; i++)
+;    sum += array[i];
+;  return sum;
+;}
+
+define i32 @test(i32 %n, i32* nocapture %array) {
+entry:
+  %cmp4 = icmp sgt i32 %n, 0
+  br i1 %cmp4, label %for.body, label %for.end
+
+for.body:
+  %i.06 = phi i32 [ %inc, %for.body ], [ 0, %entry ]
+  %sum.05 = phi i32 [ %add, %for.body ], [ 0, %entry ]
+  %arrayidx = getelementptr inbounds i32* %array, i32 %i.06
+  %0 = load i32* %arrayidx, align 4
+  %add = add nsw i32 %0, %sum.05
+  %inc = add nsw i32 %i.06, 1
+  %exitcond = icmp eq i32 %inc, %n
+  br i1 %exitcond, label %for.end, label %for.body
+
+for.end:
+  %sum.0.lcssa = phi i32 [ 0, %entry ], [ %add, %for.body ]
+  ret i32 %sum.0.lcssa
+}