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diff --git a/test/CodeGen/ARM64/sincos.ll b/test/CodeGen/ARM64/sincos.ll
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+; RUN: llc < %s -mtriple=arm64-apple-ios7 | FileCheck %s --check-prefix CHECK-IOS
+; RUN: llc < %s -mtriple=arm64-linux-gnu | FileCheck %s --check-prefix CHECK-LINUX
+
+; Combine sin / cos into a single call.
+; rdar://12856873
+
+define float @test1(float %x) nounwind {
+entry:
+; CHECK-IOS-LABEL: test1:
+; CHECK-IOS: bl ___sincosf_stret
+; CHECK-IOS: fadd s0, s0, s1
+
+; CHECK-LINUX-LABEL: test1:
+; CHECK-LINUX: bl sinf
+; CHECK-LINUX: bl cosf
+
+ %call = tail call float @sinf(float %x) nounwind readnone
+ %call1 = tail call float @cosf(float %x) nounwind readnone
+ %add = fadd float %call, %call1
+ ret float %add
+}
+
+define double @test2(double %x) nounwind {
+entry:
+; CHECK-IOS-LABEL: test2:
+; CHECK-IOS: bl ___sincos_stret
+; CHECK-IOS: fadd d0, d0, d1
+
+; CHECK-LINUX-LABEL: test2:
+; CHECK-LINUX: bl sin
+; CHECK-LINUX: bl cos
+
+ %call = tail call double @sin(double %x) nounwind readnone
+ %call1 = tail call double @cos(double %x) nounwind readnone
+ %add = fadd double %call, %call1
+ ret double %add
+}
+
+declare float @sinf(float) readonly
+declare double @sin(double) readonly
+declare float @cosf(float) readonly
+declare double @cos(double) readonly