--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/CodeGen/X86/copysign-constant-magnitude.ll	Wed Feb 18 14:55:36 2015 +0900
@@ -0,0 +1,105 @@
+; RUN: llc < %s | FileCheck %s
+
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx10.10.0"
+
+define void @test_copysign_const_magnitude_d(double %X) {
+; CHECK: [[SIGNMASK:L.+]]:
+; CHECK-NEXT:   .quad -9223372036854775808    ## double -0.000000e+00
+; CHECK-NEXT:   .quad 0                       ## double 0.000000e+00
+; CHECK: [[ZERO:L.+]]:
+; CHECK-NEXT:   .space 16
+; CHECK: [[ONE:L.+]]:
+; CHECK-NEXT:   .quad 4607182418800017408     ## double 1.000000e+00
+; CHECK-NEXT:   .quad 0                       ## double 0.000000e+00
+; CHECK-LABEL: test_copysign_const_magnitude_d:
+
+; CHECK: id
+  %iX = call double @id_d(double %X)
+
+; CHECK-NEXT: andpd [[SIGNMASK]](%rip), %xmm0
+  %d0 = call double @copysign(double 0.000000e+00, double %iX)
+
+; CHECK-NEXT: id
+  %id0 = call double @id_d(double %d0)
+
+; CHECK-NEXT: andpd [[SIGNMASK]](%rip), %xmm0
+; CHECK-NEXT: orpd [[ZERO]](%rip), %xmm0
+  %dn0 = call double @copysign(double -0.000000e+00, double %id0)
+
+; CHECK-NEXT: id
+  %idn0 = call double @id_d(double %dn0)
+
+; CHECK-NEXT: andpd [[SIGNMASK]](%rip), %xmm0
+; CHECK-NEXT: orpd [[ONE]](%rip), %xmm0
+  %d1 = call double @copysign(double 1.000000e+00, double %idn0)
+
+; CHECK-NEXT: id
+  %id1 = call double @id_d(double %d1)
+
+; CHECK-NEXT: andpd [[SIGNMASK]](%rip), %xmm0
+; CHECK-NEXT: orpd [[ONE]](%rip), %xmm0
+  %dn1 = call double @copysign(double -1.000000e+00, double %id1)
+
+; CHECK-NEXT: id
+  %idn1 = call double @id_d(double %dn1)
+
+; CHECK: retq
+  ret void
+}
+
+define void @test_copysign_const_magnitude_f(float %X) {
+; CHECK: [[SIGNMASK:L.+]]:
+; CHECK-NEXT:   .long	2147483648              ## float -0.000000e+00
+; CHECK-NEXT:   .long	0                       ## float 0.000000e+00
+; CHECK-NEXT:   .long	0                       ## float 0.000000e+00
+; CHECK-NEXT:   .long	0                       ## float 0.000000e+00
+; CHECK: [[ZERO:L.+]]:
+; CHECK-NEXT:   .space 16
+; CHECK: [[ONE:L.+]]:
+; CHECK-NEXT:   .long	1065353216              ## float 1.000000e+00
+; CHECK-NEXT:   .long	0                       ## float 0.000000e+00
+; CHECK-NEXT:   .long	0                       ## float 0.000000e+00
+; CHECK-NEXT:   .long	0                       ## float 0.000000e+00
+; CHECK-LABEL: test_copysign_const_magnitude_f:
+
+; CHECK: id
+  %iX = call float @id_f(float %X)
+
+; CHECK-NEXT: andps [[SIGNMASK]](%rip), %xmm0
+  %d0 = call float @copysignf(float 0.000000e+00, float %iX)
+
+; CHECK-NEXT: id
+  %id0 = call float @id_f(float %d0)
+
+; CHECK-NEXT: andps [[SIGNMASK]](%rip), %xmm0
+; CHECK-NEXT: orps [[ZERO]](%rip), %xmm0
+  %dn0 = call float @copysignf(float -0.000000e+00, float %id0)
+
+; CHECK-NEXT: id
+  %idn0 = call float @id_f(float %dn0)
+
+; CHECK-NEXT: andps [[SIGNMASK]](%rip), %xmm0
+; CHECK-NEXT: orps [[ONE]](%rip), %xmm0
+  %d1 = call float @copysignf(float 1.000000e+00, float %idn0)
+
+; CHECK-NEXT: id
+  %id1 = call float @id_f(float %d1)
+
+; CHECK-NEXT: andps [[SIGNMASK]](%rip), %xmm0
+; CHECK-NEXT: orps [[ONE]](%rip), %xmm0
+  %dn1 = call float @copysignf(float -1.000000e+00, float %id1)
+
+; CHECK-NEXT: id
+  %idn1 = call float @id_f(float %dn1)
+
+; CHECK: retq
+  ret void
+}
+
+declare double @copysign(double, double) nounwind readnone
+declare float @copysignf(float, float) nounwind readnone
+
+; Dummy identity functions, so we always have xmm0, and prevent optimizations.
+declare double @id_d(double)
+declare float @id_f(float)