1 files changed, 51 insertions, 0 deletions
diff --git a/test/CodeGen/X86/atom-fixup-lea3.ll b/test/CodeGen/X86/atom-fixup-lea3.ll
new file mode 100644
index 0000000..311b0b3
--- /dev/null
+++ b/test/CodeGen/X86/atom-fixup-lea3.ll
@@ -0,0 +1,51 @@
+; RUN: llc < %s -mcpu=atom -mtriple=i686-linux | FileCheck %s
+; CHECK: addl ([[reg:%[a-z]+]])
+; CHECK-NEXT: addl $4, [[reg]]
+
+; Test for the FixupLEAs pre-emit pass.
+; An LEA should NOT be substituted for the ADD instruction
+; that increments the array pointer if it is greater than 5 instructions
+; away from the memory reference that uses it.
+
+; Original C code: clang -m32 -S -O2
+;int test(int n, int * array, int * m, int * array2)
+;{
+;  int i, j = 0;
+;  int sum = 0;
+;  for (i = 0, j = 0; i < n;) {
+;    ++i;
+;    *m += array2[j++];
+;    sum += array[i];
+;  }
+;  return sum;
+;}
+
+define i32 @test(i32 %n, i32* nocapture %array, i32* nocapture %m, i32* nocapture %array2) #0 {
+entry:
+  %cmp7 = icmp sgt i32 %n, 0
+  br i1 %cmp7, label %for.body.lr.ph, label %for.end
+
+for.body.lr.ph:                                   ; preds = %entry
+  %.pre = load i32* %m, align 4
+  br label %for.body
+
+for.body:                                         ; preds = %for.body, %for.body.lr.ph
+  %0 = phi i32 [ %.pre, %for.body.lr.ph ], [ %add, %for.body ]
+  %sum.010 = phi i32 [ 0, %for.body.lr.ph ], [ %add3, %for.body ]
+  %j.09 = phi i32 [ 0, %for.body.lr.ph ], [ %inc1, %for.body ]
+  %inc1 = add nsw i32 %j.09, 1
+  %arrayidx = getelementptr inbounds i32* %array2, i32 %j.09
+  %1 = load i32* %arrayidx, align 4
+  %add = add nsw i32 %0, %1
+  store i32 %add, i32* %m, align 4
+  %arrayidx2 = getelementptr inbounds i32* %array, i32 %inc1
+  %2 = load i32* %arrayidx2, align 4
+  %add3 = add nsw i32 %2, %sum.010
+  %exitcond = icmp eq i32 %inc1, %n
+  br i1 %exitcond, label %for.end, label %for.body
+
+for.end:                                          ; preds = %for.body, %entry
+  %sum.0.lcssa = phi i32 [ 0, %entry ], [ %add3, %for.body ]
+  ret i32 %sum.0.lcssa
+}
+