From b84f3d427c2f301f2836a743547e6a20bd8ee8a4 Mon Sep 17 00:00:00 2001
From: David Goodwin <david_goodwin@apple.com>
Date: Tue, 4 Aug 2009 18:44:29 +0000
Subject: [PATCH] Match common pattern for FNMAC. Add NEON SP support.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78085 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/ARMInstrNEON.td | 1 +
 lib/Target/ARM/ARMInstrVFP.td  | 5 +++++
 test/CodeGen/ARM/fnmacs.ll     | 1 -
 3 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/lib/Target/ARM/ARMInstrNEON.td b/lib/Target/ARM/ARMInstrNEON.td
index ec4702f5d69..147490c7843 100644
--- a/lib/Target/ARM/ARMInstrNEON.td
+++ b/lib/Target/ARM/ARMInstrNEON.td
@@ -953,6 +953,7 @@ defm VQDMLSL  : N3VLInt3_HS<0, 1, 0b1011, 0, "vqdmlsl.s", int_arm_neon_vqdmlsl>;
 
 // Vector Multiply-Accumulate/Subtract used for single-precision FP
 def : N3VDMulOps<fmul, fadd, VMLAfd>;
+def : N3VDMulOps<fmul, fsub, VMLSfd>;
 
 // Vector Subtract Operations.
 
diff --git a/lib/Target/ARM/ARMInstrVFP.td b/lib/Target/ARM/ARMInstrVFP.td
index 2ecf5f3a420..923606d9772 100644
--- a/lib/Target/ARM/ARMInstrVFP.td
+++ b/lib/Target/ARM/ARMInstrVFP.td
@@ -346,6 +346,11 @@ def FNMACS : ASbIn<0b11100000, (outs SPR:$dst), (ins SPR:$dstin, SPR:$a, SPR:$b)
   let Inst{6} = 1;
 }
 
+def : Pat<(fsub DPR:$dstin, (fmul DPR:$a, DPR:$b)),
+          (FNMACD DPR:$dstin, DPR:$a, DPR:$b)>, Requires<[DontUseNEONForFP]>;
+def : Pat<(fsub SPR:$dstin, (fmul SPR:$a, SPR:$b)),
+          (FNMACS SPR:$dstin, SPR:$a, SPR:$b)>, Requires<[DontUseNEONForFP]>;
+
 def FNMSCD : ADbI<0b11100001, (outs DPR:$dst), (ins DPR:$dstin, DPR:$a, DPR:$b),
                  "fnmscd", " $dst, $a, $b",
              [(set DPR:$dst, (fsub (fneg (fmul DPR:$a, DPR:$b)), DPR:$dstin))]>,
diff --git a/test/CodeGen/ARM/fnmacs.ll b/test/CodeGen/ARM/fnmacs.ll
index 537c4110ba4..4b0b2ed20a5 100644
--- a/test/CodeGen/ARM/fnmacs.ll
+++ b/test/CodeGen/ARM/fnmacs.ll
@@ -1,4 +1,3 @@
-; XFAIL: *
 ; RUN: llvm-as < %s | llc -march=arm -mattr=+vfp2 | grep -E {fnmacs\\W*s\[0-9\]+,\\W*s\[0-9\]+,\\W*s\[0-9\]+} | count 1
 ; RUN: llvm-as < %s | llc -march=arm -mattr=+neon,+neonfp | grep -E {vmls.f32\\W*d\[0-9\]+,\\W*d\[0-9\]+,\\W*d\[0-9\]+} | count 1
 ; RUN: llvm-as < %s | llc -march=arm -mattr=+neon,-neonfp | grep -E {fnmacs\\W*s\[0-9\]+,\\W*s\[0-9\]+,\\W*s\[0-9\]+} | count 1