[AArch64] add tests for fake fneg; NFC
See comments in D73978 for background.
diff --git a/llvm/test/CodeGen/AArch64/arm64-fp.ll b/llvm/test/CodeGen/AArch64/arm64-fp.ll
index 85c5f25..0e40778 100644
--- a/llvm/test/CodeGen/AArch64/arm64-fp.ll
+++ b/llvm/test/CodeGen/AArch64/arm64-fp.ll
@@ -48,4 +48,27 @@
ret { double, double } %r1
}
+define <2 x float> @fake_fneg_splat_extract(<4 x float> %rhs) {
+; CHECK-LABEL: fake_fneg_splat_extract:
+; CHECK: // %bb.0:
+; CHECK-NEXT: fneg v0.4s, v0.4s
+; CHECK-NEXT: dup v0.2s, v0.s[3]
+; CHECK-NEXT: ret
+ %rhs_neg = fsub <4 x float> <float -0.0, float -0.0, float -0.0, float -0.0>, %rhs
+ %splat = shufflevector <4 x float> %rhs_neg, <4 x float> undef, <2 x i32> <i32 3, i32 3>
+ ret <2 x float> %splat
+}
+
+define <2 x float> @fake_fneg_splat_extract_undef(<4 x float> %rhs) {
+; CHECK-LABEL: fake_fneg_splat_extract_undef:
+; CHECK: // %bb.0:
+; CHECK-NEXT: ext v0.16b, v0.16b, v0.16b, #8
+; CHECK-NEXT: fneg v0.2s, v0.2s
+; CHECK-NEXT: dup v0.2s, v0.s[1]
+; CHECK-NEXT: ret
+ %rhs_neg = fsub <4 x float> <float undef, float -0.0, float -0.0, float -0.0>, %rhs
+ %splat = shufflevector <4 x float> %rhs_neg, <4 x float> undef, <2 x i32> <i32 3, i32 3>
+ ret <2 x float> %splat
+}
+
attributes #0 = { "no-signed-zeros-fp-math"="true" }
