Avoid putting a split past the end of the live range; always shrink wrap live interval in the barrier mbb.

llvm-svn: 58309

1 files changed, 38 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/X86/pre-split9.ll b/llvm/test/CodeGen/X86/pre-split9.ll
new file mode 100644
index 00000000000..bfafe85b8c6
--- /dev/null
+++ b/llvm/test/CodeGen/X86/pre-split9.ll
@@ -0,0 +1,38 @@
+; 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
+
+@current_surfaces.b = external global i1		; <i1*> [#uses=1]
+
+declare double @sin(double) nounwind readonly
+
+declare double @asin(double) nounwind readonly
+
+declare double @tan(double) nounwind readonly
+
+define fastcc void @trace_line(i32 %line) nounwind {
+entry:
+	%.b3 = load i1* @current_surfaces.b		; <i1> [#uses=1]
+	br i1 %.b3, label %bb, label %return
+
+bb:		; preds = %bb9.i, %entry
+	%.rle4 = phi double [ %8, %bb9.i ], [ 0.000000e+00, %entry ]		; <double> [#uses=1]
+	%0 = load double* null, align 8		; <double> [#uses=3]
+	%1 = fcmp une double %0, 0.000000e+00		; <i1> [#uses=1]
+	br i1 %1, label %bb9.i, label %bb13.i
+
+bb9.i:		; preds = %bb
+	%2 = sub double %.rle4, %0		; <double> [#uses=0]
+	%3 = tail call double @asin(double 0.000000e+00) nounwind readonly		; <double> [#uses=0]
+	%4 = tail call double @sin(double 0.000000e+00) nounwind readonly		; <double> [#uses=1]
+	%5 = mul double %4, %0		; <double> [#uses=1]
+	%6 = tail call double @tan(double 0.000000e+00) nounwind readonly		; <double> [#uses=0]
+	%7 = mul double %5, 0.000000e+00		; <double> [#uses=1]
+	%8 = add double %7, 0.000000e+00		; <double> [#uses=1]
+	br i1 false, label %return, label %bb
+
+bb13.i:		; preds = %bb
+	unreachable
+
+return:		; preds = %bb9.i, %entry
+	ret void
+}