From: Sjoerd Meijer <sjoerd.meijer@arm.com>
Date: Fri, 16 Sep 2016 13:16:52 +0000 (+0000)
Subject: Reverting r281719, this is causing buildbot failures and timeouts again.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=ea7e0cd04b413b9ecf4d3356a5e5c57eadbe4c5a;p=llvm

Reverting r281719, this is causing buildbot failures and timeouts again.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@281722 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index 619264f7548..8a864c27962 100644
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -12434,24 +12434,6 @@ SDValue ARMTargetLowering::LowerDivRem(SDValue Op, SelectionDAG &DAG) const {
   bool isSigned = (Opcode == ISD::SDIVREM);
   EVT VT = Op->getValueType(0);
   Type *Ty = VT.getTypeForEVT(*DAG.getContext());
-  SDLoc dl(Op);
-
-  // If the target has hardware divide, use divide + multiply + subtract:
-  //     div = a / b
-  //     rem = a - b * div
-  //     return {div, rem}
-  // This should be lowered into UDIV/SDIV + MLS later on.
-  if (Subtarget->hasDivide()) {
-    unsigned DivOpcode = isSigned ? ISD::SDIV : ISD::UDIV;
-    const SDValue Dividend = Op->getOperand(0);
-    const SDValue Divisor = Op->getOperand(1);
-    SDValue Div = DAG.getNode(DivOpcode, dl, VT, Dividend, Divisor);
-    SDValue Mul = DAG.getNode(ISD::MUL, dl, VT, Div, Divisor);
-    SDValue Rem = DAG.getNode(ISD::SUB, dl, VT, Dividend, Mul);
-
-    SDValue Values[2] = {Div, Rem};
-    return DAG.getNode(ISD::MERGE_VALUES, dl, DAG.getVTList(VT, VT), Values);
-  }
 
   RTLIB::Libcall LC = getDivRemLibcall(Op.getNode(),
                                        VT.getSimpleVT().SimpleTy);
@@ -12465,6 +12447,7 @@ SDValue ARMTargetLowering::LowerDivRem(SDValue Op, SelectionDAG &DAG) const {
 
   Type *RetTy = (Type*)StructType::get(Ty, Ty, nullptr);
 
+  SDLoc dl(Op);
   TargetLowering::CallLoweringInfo CLI(DAG);
   CLI.setDebugLoc(dl).setChain(InChain)
     .setCallee(getLibcallCallingConv(LC), RetTy, Callee, std::move(Args))
diff --git a/test/CodeGen/ARM/urem-opt-size.ll b/test/CodeGen/ARM/urem-opt-size.ll
index b9c2188accd..7f1cd43bc4e 100644
--- a/test/CodeGen/ARM/urem-opt-size.ll
+++ b/test/CodeGen/ARM/urem-opt-size.ll
@@ -3,12 +3,7 @@
 ; expanded to a sequence of umull, lsrs, muls and sub instructions, but
 ; just a call to __aeabi_uidivmod.
 ;
-; When the processor features hardware division, UDIV + UREM can be turned
-; into UDIV + MLS. This prevents the library function __aeabi_uidivmod to be
-; pulled into the binary. The test uses ARMv7-M.
-;
 ; RUN: llc -mtriple=armv7a-eabi -mattr=-neon -verify-machineinstrs %s -o - | FileCheck %s
-; RUN: llc -mtriple=thumbv7m-eabi -verify-machineinstrs %s -o - | FileCheck %s -check-prefix=V7M
 
 target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
 target triple = "thumbv7m-arm-none-eabi"
@@ -33,16 +28,11 @@ entry:
   ret i32 %div
 }
 
-; Test for unsigned remainder
 define i32 @foo3() local_unnamed_addr #0 {
 entry:
 ; CHECK-LABEL: foo3:
 ; CHECK: __aeabi_uidivmod
 ; CHECK-NOT: umull
-; V7M-LABEL: foo3:
-; V7M: udiv [[R2:r[0-9]+]], [[R0:r[0-9]+]], [[R1:r[0-9]+]]
-; V7M: mls {{r[0-9]+}}, [[R2]], [[R1]], [[R0]]
-; V7M-NOT: __aeabi_uidivmod
   %call = tail call i32 bitcast (i32 (...)* @GetValue to i32 ()*)()
   %rem = urem i32 %call, 1000000
   %cmp = icmp eq i32 %rem, 0
@@ -50,39 +40,6 @@ entry:
   ret i32 %conv
 }
 
-; Test for signed remainder
-define i32 @foo4() local_unnamed_addr #0 {
-entry:
-; CHECK-LABEL: foo4:
-; CHECK:__aeabi_idivmod
-; V7M-LABEL: foo4:
-; V7M: sdiv [[R2:r[0-9]+]], [[R0:r[0-9]+]], [[R1:r[0-9]+]]
-; V7M: mls {{r[0-9]+}}, [[R2]], [[R1]], [[R0]]
-; V7M-NOT: __aeabi_idivmod
-  %call = tail call i32 bitcast (i32 (...)* @GetValue to i32 ()*)()
-  %rem = srem i32 %call, 1000000
-  ret i32 %rem
-}
-
-; Check that doing a sdiv+srem has the same effect as only the srem,
-; as the division needs to be computed anyway in order to calculate
-; the remainder (i.e. make sure we don't end up with two divisions).
-define i32 @foo5() local_unnamed_addr #0 {
-entry:
-; CHECK-LABEL: foo5:
-; CHECK:__aeabi_idivmod
-; V7M-LABEL: foo5:
-; V7M: sdiv [[R2:r[0-9]+]], [[R0:r[0-9]+]], [[R1:r[0-9]+]]
-; V7M-NOT: sdiv
-; V7M: mls {{r[0-9]+}}, [[R2]], [[R1]], [[R0]]
-; V7M-NOT: __aeabi_idivmod
-  %call = tail call i32 bitcast (i32 (...)* @GetValue to i32 ()*)()
-  %div = sdiv i32 %call, 1000000
-  %rem = srem i32 %call, 1000000
-  %add = add i32 %div, %rem
-  ret i32 %add
-}
-
 declare i32 @GetValue(...) local_unnamed_addr
 
 attributes #0 = { minsize nounwind optsize }