D16532.diff
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	Index: lib/CodeGen/SelectionDAG/DAGCombiner.cpp
	===================================================================
	--- lib/CodeGen/SelectionDAG/DAGCombiner.cpp
	+++ lib/CodeGen/SelectionDAG/DAGCombiner.cpp
	@@ -9022,7 +9022,8 @@
	return DAG.getNode(ISD::FABS, SDLoc(N), VT, N0);

	// copysign(x, copysign(y,z)) -> copysign(x, z)
	- if (N1.getOpcode() == ISD::FCOPYSIGN)
	+ if (DAG.getTarget().Options.UnsafeFPMath &&
	+ N1.getOpcode() == ISD::FCOPYSIGN)
	return DAG.getNode(ISD::FCOPYSIGN, SDLoc(N), VT,
	N0, N1.getOperand(1));

	Index: test/CodeGen/X86/sse-fcopysign.ll
	===================================================================
	--- test/CodeGen/X86/sse-fcopysign.ll
	+++ test/CodeGen/X86/sse-fcopysign.ll
	@@ -152,3 +152,19 @@

	declare float @llvm.copysign.f32(float %Mag, float %Sgn)
	declare double @llvm.copysign.f64(double %Mag, double %Sgn)
	+
	+;
	+; Unsafe transformations
	+;
	+
	+define double @safe(float %a, double %b) "unsafe-fp-math"="false" {
	+; CHECK-LABEL: safe:
	+; CHECK: andps
	+; CHECK-NEXT: orps
	+; CHECK: cvtss2sd
	+
	+ %r1 = call float @llvm.copysign.f32(float 1.000000e+00, float %a)
	+ %r2 = fpext float %r1 to double
	+ %r3 = call double @llvm.copysign.f64(double %b, double %r2)
	+ ret double %r3
	+}