Do not shrink wrap live interval in a mbb if it's livein any of its successor blocks. The mbb can be revisited again after all of the successors are processed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58184 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 36 insertions, 0 deletions

diff --git a/test/CodeGen/X86/pre-split6.ll b/test/CodeGen/X86/pre-split6.ll
new file mode 100644
index 0000000000..c075b2a39e
--- /dev/null
+++ b/test/CodeGen/X86/pre-split6.ll
@@ -0,0 +1,36 @@
+; RUN: llvm-as < %s | llc -march=x86 -mattr=+sse2 -pre-alloc-split
+
+@current_surfaces.b = external global i1		; <i1*> [#uses=1]
+
+declare double @sin(double) nounwind readonly
+
+declare double @asin(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.nph, label %return
+
+bb.nph:		; preds = %entry
+	%0 = load double* null, align 8		; <double> [#uses=1]
+	%1 = load double* null, align 8		; <double> [#uses=2]
+	%2 = fcmp une double %0, 0.000000e+00		; <i1> [#uses=1]
+	br i1 %2, label %bb9.i, label %bb13.i
+
+bb9.i:		; preds = %bb.nph
+	%3 = tail call double @asin(double 0.000000e+00) nounwind readonly		; <double> [#uses=0]
+	%4 = fdiv double 1.000000e+00, %1		; <double> [#uses=1]
+	%5 = mul double %4, 0.000000e+00		; <double> [#uses=1]
+	%6 = tail call double @asin(double %5) nounwind readonly		; <double> [#uses=0]
+	unreachable
+
+bb13.i:		; preds = %bb.nph
+	%7 = fdiv double 1.000000e+00, %1		; <double> [#uses=1]
+	%8 = tail call double @sin(double 0.000000e+00) nounwind readonly		; <double> [#uses=1]
+	%9 = mul double %7, %8		; <double> [#uses=1]
+	%10 = tail call double @asin(double %9) nounwind readonly		; <double> [#uses=0]
+	unreachable
+
+return:		; preds = %entry
+	ret void
+}