Avoid splitting an interval multiple times; avoid splitting re-materializable val# (for now).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58068 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/X86/pre-split1.ll b/test/CodeGen/X86/pre-split1.ll
new file mode 100644
index 0000000..f99ac89
--- /dev/null
+++ b/test/CodeGen/X86/pre-split1.ll
@@ -0,0 +1,23 @@
+; RUN: llvm-as < %s | llc -march=x86 -mattr=+sse2 -pre-alloc-split -stats |& \
+; RUN: grep {pre-alloc-split} | grep {Number of intervals split} | grep 1
+
+define void @test(double* %P, i32 %cond) nounwind {
+entry:
+ %0 = load double* %P, align 8 ; <double> [#uses=1]
+ %1 = add double %0, 4.000000e+00 ; <double> [#uses=2]
+ %2 = icmp eq i32 %cond, 0 ; <i1> [#uses=1]
+ br i1 %2, label %bb1, label %bb
+
+bb: ; preds = %entry
+ %3 = add double %1, 4.000000e+00 ; <double> [#uses=1]
+ br label %bb1
+
+bb1: ; preds = %bb, %entry
+ %A.0 = phi double [ %3, %bb ], [ %1, %entry ] ; <double> [#uses=1]
+ %4 = mul double %A.0, 4.000000e+00 ; <double> [#uses=1]
+ %5 = tail call i32 (...)* @bar() nounwind ; <i32> [#uses=0]
+ store double %4, double* %P, align 8
+ ret void
+}
+
+declare i32 @bar(...)