1 files changed, 43 insertions, 0 deletions
diff --git a/test/CodeGen/X86/sink-hoist.ll b/test/CodeGen/X86/sink-hoist.ll
new file mode 100644
index 0000000..0f4e63f
--- /dev/null
+++ b/test/CodeGen/X86/sink-hoist.ll
@@ -0,0 +1,43 @@
+; RUN: llc < %s -march=x86-64 -asm-verbose=false | FileCheck %s
+
+; Currently, floating-point selects are lowered to CFG triangles.
+; This means that one side of the select is always unconditionally
+; evaluated, however with MachineSink we can sink the other side so
+; that it's conditionally evaluated.
+
+; CHECK: foo:
+; CHECK-NEXT: divsd
+; CHECK:      testb $1, %dil
+; CHECK-NEXT: jne
+; CHECK:      divsd
+
+define double @foo(double %x, double %y, i1 %c) nounwind {
+  %a = fdiv double %x, 3.2
+  %b = fdiv double %y, 3.3
+  %z = select i1 %c, double %a, double %b
+  ret double %z
+}
+
+; Hoist floating-point constant-pool loads out of loops.
+
+; CHECK: bar:
+; CHECK: movsd
+; CHECK: align
+define void @bar(double* nocapture %p, i64 %n) nounwind {
+entry:
+  %0 = icmp sgt i64 %n, 0
+  br i1 %0, label %bb, label %return
+
+bb:
+  %i.03 = phi i64 [ 0, %entry ], [ %3, %bb ]
+  %scevgep = getelementptr double* %p, i64 %i.03
+  %1 = load double* %scevgep, align 8
+  %2 = fdiv double 3.200000e+00, %1
+  store double %2, double* %scevgep, align 8
+  %3 = add nsw i64 %i.03, 1
+  %exitcond = icmp eq i64 %3, %n
+  br i1 %exitcond, label %return, label %bb
+
+return:
+  ret void
+}