1 files changed, 78 insertions, 0 deletions
diff --git a/test/CodeGen/AArch64/fadd-combines.ll b/test/CodeGen/AArch64/fadd-combines.ll
new file mode 100644
index 000000000000..c106f293ccff
--- /dev/null
+++ b/test/CodeGen/AArch64/fadd-combines.ll
@@ -0,0 +1,78 @@
+; RUN: llc < %s -mtriple=aarch64-none-linux-gnu -verify-machineinstrs | FileCheck %s
+
+; CHECK-LABEL: test1:
+; CHECK: fadd d1, d1, d1
+; CHECK: fsub d0, d0, d1
+define double @test1(double %a, double %b) local_unnamed_addr #0 {
+entry:
+  %mul = fmul double %b, -2.000000e+00
+  %add1 = fadd double %a, %mul
+  ret double %add1
+}
+
+; DAGCombine will canonicalize 'a - 2.0*b' to 'a + -2.0*b'
+; CHECK-LABEL: test2:
+; CHECK: fadd d1, d1, d1
+; CHECK: fsub d0, d0, d1
+define double @test2(double %a, double %b) local_unnamed_addr #0 {
+entry:
+  %mul = fmul double %b, 2.000000e+00
+  %add1 = fsub double %a, %mul
+  ret double %add1
+}
+
+; CHECK-LABEL: test3:
+; CHECK: fmul d0, d0, d1
+; CHECK: fadd d1, d2, d2
+; CHECK: fsub d0, d0, d1
+define double @test3(double %a, double %b, double %c) local_unnamed_addr #0 {
+entry:
+  %mul = fmul double %a, %b
+  %mul1 = fmul double %c, 2.000000e+00
+  %sub = fsub double %mul, %mul1
+  ret double %sub
+}
+
+; CHECK-LABEL: test4:
+; CHECK: fmul d0, d0, d1
+; CHECK: fadd d1, d2, d2
+; CHECK: fsub d0, d0, d1
+define double @test4(double %a, double %b, double %c) local_unnamed_addr #0 {
+entry:
+  %mul = fmul double %a, %b
+  %mul1 = fmul double %c, -2.000000e+00
+  %add2 = fadd double %mul, %mul1
+  ret double %add2
+}
+
+; CHECK-LABEL: test5:
+; CHECK: fadd v1.4s, v1.4s, v1.4s
+; CHECK: fsub v0.4s, v0.4s, v1.4s
+define <4 x float> @test5(<4 x float> %a, <4 x float> %b) {
+  %mul = fmul <4 x float> %b, <float -2.0, float -2.0, float -2.0, float -2.0>
+  %add = fadd <4 x float> %a, %mul
+  ret <4 x float> %add
+}
+
+; CHECK-LABEL: test6:
+; CHECK: fadd v1.4s, v1.4s, v1.4s
+; CHECK: fsub v0.4s, v0.4s, v1.4s
+define <4 x float> @test6(<4 x float> %a, <4 x float> %b) {
+  %mul = fmul <4 x float> %b, <float 2.0, float 2.0, float 2.0, float 2.0>
+  %add = fsub <4 x float> %a, %mul
+  ret <4 x float> %add
+}
+
+; Don't fold (fadd A, (fmul B, -2.0)) -> (fsub A, (fadd B, B)) if the fmul has
+; multiple uses.
+; CHECK-LABEL: test7:
+; CHECK: fmul
+define double @test7(double %a, double %b) local_unnamed_addr #0 {
+entry:
+  %mul = fmul double %b, -2.000000e+00
+  %add1 = fadd double %a, %mul
+  call void @use(double %mul)
+  ret double %add1
+}
+
+declare void @use(double)