[llvm] r281323 - [Thumb] Teach ISel how to lower compares of AND bitmasks efficiently
Renato Golin via llvm-commits
llvm-commits at lists.llvm.org
Tue Sep 13 16:29:38 PDT 2016
Hi James,
This one looks yours, again...
http://lab.llvm.org:8011/builders/clang-cmake-thumbv7-a15-full-sh/builds/4073
Cheers,
Renato
On 13 Sep 2016 1:21 p.m., "James Molloy via llvm-commits" <
llvm-commits at lists.llvm.org> wrote:
> Author: jamesm
> Date: Tue Sep 13 07:12:32 2016
> New Revision: 281323
>
> URL: http://llvm.org/viewvc/llvm-project?rev=281323&view=rev
> Log:
> [Thumb] Teach ISel how to lower compares of AND bitmasks efficiently
>
> For the common pattern (CMPZ (AND x, #bitmask), #0), we can do some more
> efficient instruction selection if the bitmask is one consecutive sequence
> of set bits (32 - clz(bm) - ctz(bm) == popcount(bm)).
>
> 1) If the bitmask touches the LSB, then we can remove all the upper bits
> and set the flags by doing one LSLS.
> 2) If the bitmask touches the MSB, then we can remove all the lower bits
> and set the flags with one LSRS.
> 3) If the bitmask has popcount == 1 (only one set bit), we can shift that
> bit into the sign bit with one LSLS and change the condition query from
> NE/EQ to MI/PL (we could also implement this by shifting into the carry bit
> and branching on BCC/BCS).
> 4) Otherwise, we can emit a sequence of LSLS+LSRS to remove the upper and
> lower zero bits of the mask.
>
> 1-3 require only one 16-bit instruction and can elide the CMP. 4 requires
> two 16-bit instructions but can elide the CMP and doesn't require
> materializing a complex immediate, so is also a win.
>
> Added:
> llvm/trunk/test/CodeGen/ARM/and-cmpz.ll
> Modified:
> llvm/trunk/lib/Target/ARM/ARMBaseInstrInfo.cpp
> llvm/trunk/lib/Target/ARM/ARMISelDAGToDAG.cpp
> llvm/trunk/test/CodeGen/ARM/arm-and-tst-peephole.ll
> llvm/trunk/test/CodeGen/ARM/arm-shrink-wrapping.ll
> llvm/trunk/test/CodeGen/ARM/call-tc.ll
> llvm/trunk/test/CodeGen/ARM/debug-info-branch-folding.ll
> llvm/trunk/test/CodeGen/Thumb/thumb-shrink-wrapping.ll
> llvm/trunk/test/CodeGen/Thumb2/float-ops.ll
>
> Modified: llvm/trunk/lib/Target/ARM/ARMBaseInstrInfo.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/
> ARM/ARMBaseInstrInfo.cpp?rev=281323&r1=281322&r2=281323&view=diff
> ============================================================
> ==================
> --- llvm/trunk/lib/Target/ARM/ARMBaseInstrInfo.cpp (original)
> +++ llvm/trunk/lib/Target/ARM/ARMBaseInstrInfo.cpp Tue Sep 13 07:12:32
> 2016
> @@ -2528,7 +2528,11 @@ bool ARMBaseInstrInfo::optimizeCompareIn
> case ARM::EORrr:
> case ARM::EORri:
> case ARM::t2EORrr:
> - case ARM::t2EORri: {
> + case ARM::t2EORri:
> + case ARM::t2LSRri:
> + case ARM::t2LSRrr:
> + case ARM::t2LSLri:
> + case ARM::t2LSLrr: {
> // Scan forward for the use of CPSR
> // When checking against MI: if it's a conditional code that requires
> // checking of the V bit or C bit, then this is not safe to do.
>
> Modified: llvm/trunk/lib/Target/ARM/ARMISelDAGToDAG.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/
> ARM/ARMISelDAGToDAG.cpp?rev=281323&r1=281322&r2=281323&view=diff
> ============================================================
> ==================
> --- llvm/trunk/lib/Target/ARM/ARMISelDAGToDAG.cpp (original)
> +++ llvm/trunk/lib/Target/ARM/ARMISelDAGToDAG.cpp Tue Sep 13 07:12:32 2016
> @@ -244,7 +244,8 @@ private:
> bool tryInlineAsm(SDNode *N);
>
> void SelectConcatVector(SDNode *N);
> -
> + void SelectCMPZ(SDNode *N, bool &SwitchEQNEToPLMI);
> +
> bool trySMLAWSMULW(SDNode *N);
>
> void SelectCMP_SWAP(SDNode *N);
> @@ -2693,6 +2694,83 @@ void ARMDAGToDAGISel::SelectConcatVector
> ReplaceNode(N, createDRegPairNode(VT, N->getOperand(0),
> N->getOperand(1)));
> }
>
> +static Optional<std::pair<unsigned, unsigned>>
> +getContiguousRangeOfSetBits(const APInt &A) {
> + unsigned FirstOne = A.getBitWidth() - A.countLeadingZeros() - 1;
> + unsigned LastOne = A.countTrailingZeros();
> + if (A.countPopulation() != (FirstOne - LastOne + 1))
> + return Optional<std::pair<unsigned,unsigned>>();
> + return std::make_pair(FirstOne, LastOne);
> +}
> +
> +void ARMDAGToDAGISel::SelectCMPZ(SDNode *N, bool &SwitchEQNEToPLMI) {
> + assert(N->getOpcode() == ARMISD::CMPZ);
> + SwitchEQNEToPLMI = false;
> +
> + if (!Subtarget->isThumb())
> + // FIXME: Work out whether it is profitable to do this in A32 mode -
> LSL and
> + // LSR don't exist as standalone instructions - they need the barrel
> shifter.
> + return;
> + // select (cmpz (and X, C), #0) -> (LSLS X) or (LSRS X) or (LSRS (LSLS
> X))
> + SDValue And = N->getOperand(0);
> + SDValue Zero = N->getOperand(1);
> + if (!isa<ConstantSDNode>(Zero) || !cast<ConstantSDNode>(Zero)->isNullValue()
> ||
> + And->getOpcode() != ISD::AND)
> + return;
> + SDValue X = And.getOperand(0);
> + auto C = dyn_cast<ConstantSDNode>(And.getOperand(1));
> +
> + if (!C || !X->hasOneUse())
> + return;
> + auto Range = getContiguousRangeOfSetBits(C->getAPIntValue());
> + if (!Range)
> + return;
> +
> + // There are several ways to lower this:
> + SDNode *NewN;
> + SDLoc dl(N);
> +
> + auto EmitShift = [&](unsigned Opc, SDValue Src, unsigned Imm) ->
> SDNode* {
> + if (Subtarget->isThumb2()) {
> + Opc = (Opc == ARM::tLSLri) ? ARM::t2LSLri : ARM::t2LSRri;
> + SDValue Ops[] = { Src, CurDAG->getTargetConstant(Imm, dl, MVT::i32),
> + getAL(CurDAG, dl), CurDAG->getRegister(0,
> MVT::i32),
> + CurDAG->getRegister(0, MVT::i32) };
> + return CurDAG->getMachineNode(Opc, dl, MVT::i32, Ops);
> + } else {
> + SDValue Ops[] = {CurDAG->getRegister(ARM::CPSR, MVT::i32), Src,
> + CurDAG->getTargetConstant(Imm, dl, MVT::i32),
> + getAL(CurDAG, dl), CurDAG->getRegister(0,
> MVT::i32)};
> + return CurDAG->getMachineNode(Opc, dl, MVT::i32, Ops);
> + }
> + };
> +
> + if (Range->second == 0) {
> + // 1. Mask includes the LSB -> Simply shift the top N bits off
> + NewN = EmitShift(ARM::tLSLri, X, 31 - Range->first);
> + ReplaceNode(And.getNode(), NewN);
> + } else if (Range->first == 31) {
> + // 2. Mask includes the MSB -> Simply shift the bottom N bits off
> + NewN = EmitShift(ARM::tLSRri, X, Range->second);
> + ReplaceNode(And.getNode(), NewN);
> + } else if (Range->first == Range->second) {
> + // 3. Only one bit is set. We can shift this into the sign bit and
> use a
> + // PL/MI comparison.
> + NewN = EmitShift(ARM::tLSLri, X, 31 - Range->first);
> + ReplaceNode(And.getNode(), NewN);
> +
> + SwitchEQNEToPLMI = true;
> + } else if (!Subtarget->hasV6T2Ops()) {
> + // 4. Do a double shift to clear bottom and top bits, but only in
> + // thumb-1 mode as in thumb-2 we can use UBFX.
> + NewN = EmitShift(ARM::tLSLri, X, 31 - Range->first);
> + NewN = EmitShift(ARM::tLSRri, SDValue(NewN, 0),
> + Range->second + (31 - Range->first));
> + ReplaceNode(And.getNode(), NewN);
> + }
> +
> +}
> +
> void ARMDAGToDAGISel::Select(SDNode *N) {
> SDLoc dl(N);
>
> @@ -2920,6 +2998,7 @@ void ARMDAGToDAGISel::Select(SDNode *N)
> return;
> }
> }
> +
> break;
> }
> case ARMISD::VMOVRRD:
> @@ -3110,9 +3189,27 @@ void ARMDAGToDAGISel::Select(SDNode *N)
> assert(N2.getOpcode() == ISD::Constant);
> assert(N3.getOpcode() == ISD::Register);
>
> - SDValue Tmp2 = CurDAG->getTargetConstant(((unsigned)
> - cast<ConstantSDNode>(N2)->getZExtValue()),
> dl,
> - MVT::i32);
> + unsigned CC = (unsigned) cast<ConstantSDNode>(N2)->getZExtValue();
> +
> + if (InFlag.getOpcode() == ARMISD::CMPZ) {
> + bool SwitchEQNEToPLMI;
> + SelectCMPZ(InFlag.getNode(), SwitchEQNEToPLMI);
> + InFlag = N->getOperand(4);
> +
> + if (SwitchEQNEToPLMI) {
> + switch ((ARMCC::CondCodes)CC) {
> + default: llvm_unreachable("CMPZ must be either NE or EQ!");
> + case ARMCC::NE:
> + CC = (unsigned)ARMCC::MI;
> + break;
> + case ARMCC::EQ:
> + CC = (unsigned)ARMCC::PL;
> + break;
> + }
> + }
> + }
> +
> + SDValue Tmp2 = CurDAG->getTargetConstant(CC, dl, MVT::i32);
> SDValue Ops[] = { N1, Tmp2, N3, Chain, InFlag };
> SDNode *ResNode = CurDAG->getMachineNode(Opc, dl, MVT::Other,
> MVT::Glue, Ops);
> @@ -3166,6 +3263,38 @@ void ARMDAGToDAGISel::Select(SDNode *N)
> }
> // Other cases are autogenerated.
> break;
> + }
> +
> + case ARMISD::CMOV: {
> + SDValue InFlag = N->getOperand(4);
> +
> + if (InFlag.getOpcode() == ARMISD::CMPZ) {
> + bool SwitchEQNEToPLMI;
> + SelectCMPZ(InFlag.getNode(), SwitchEQNEToPLMI);
> +
> + if (SwitchEQNEToPLMI) {
> + SDValue ARMcc = N->getOperand(2);
> + ARMCC::CondCodes CC =
> + (ARMCC::CondCodes)cast<ConstantSDNode>(ARMcc)->getZExtValue();
> +
> + switch (CC) {
> + default: llvm_unreachable("CMPZ must be either NE or EQ!");
> + case ARMCC::NE:
> + CC = ARMCC::MI;
> + break;
> + case ARMCC::EQ:
> + CC = ARMCC::PL;
> + break;
> + }
> + SDValue NewARMcc = CurDAG->getConstant((unsigned)CC, dl,
> MVT::i32);
> + SDValue Ops[] = {N->getOperand(0), N->getOperand(1), NewARMcc,
> + N->getOperand(3), N->getOperand(4)};
> + CurDAG->MorphNodeTo(N, ARMISD::CMOV, N->getVTList(), Ops);
> + }
> +
> + }
> + // Other cases are autogenerated.
> + break;
> }
>
> case ARMISD::VZIP: {
>
> Added: llvm/trunk/test/CodeGen/ARM/and-cmpz.ll
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/
> CodeGen/ARM/and-cmpz.ll?rev=281323&view=auto
> ============================================================
> ==================
> --- llvm/trunk/test/CodeGen/ARM/and-cmpz.ll (added)
> +++ llvm/trunk/test/CodeGen/ARM/and-cmpz.ll Tue Sep 13 07:12:32 2016
> @@ -0,0 +1,71 @@
> +; RUN: llc -mtriple=thumbv7m-linux-gnu < %s | FileCheck %s
> --check-prefix=CHECK --check-prefix=T2
> +; RUN: llc -mtriple=thumbv6m-linux-gnu < %s | FileCheck %s
> --check-prefix=CHECK --check-prefix=T1
> +
> +; CHECK-LABEL: single_bit:
> +; CHECK: lsls r0, r0, #23
> +; T2-NEXT: mov
> +; T2-NEXT: it
> +; T1-NEXT: bmi
> +define i32 @single_bit(i32 %p) {
> + %a = and i32 %p, 256
> + %b = icmp eq i32 %a, 0
> + br i1 %b, label %true, label %false
> +
> +true:
> + ret i32 1
> +
> +false:
> + ret i32 2
> +}
> +
> +; CHECK-LABEL: multi_bit_lsb_ubfx:
> +; CHECK: lsls r0, r0, #24
> +; T2-NEXT: mov
> +; T2-NEXT: it
> +; T1-NEXT: beq
> +define i32 @multi_bit_lsb_ubfx(i32 %p) {
> + %a = and i32 %p, 255
> + %b = icmp eq i32 %a, 0
> + br i1 %b, label %true, label %false
> +
> +true:
> + ret i32 1
> +
> +false:
> + ret i32 2
> +}
> +
> +; CHECK-LABEL: multi_bit_msb:
> +; CHECK: lsrs r0, r0, #24
> +; T2-NEXT: mov
> +; T2-NEXT: it
> +; T1-NEXT: beq
> +define i32 @multi_bit_msb(i32 %p) {
> + %a = and i32 %p, 4278190080 ; 0xff000000
> + %b = icmp eq i32 %a, 0
> + br i1 %b, label %true, label %false
> +
> +true:
> + ret i32 1
> +
> +false:
> + ret i32 2
> +}
> +
> +; CHECK-LABEL: multi_bit_nosb:
> +; T1: lsls r0, r0, #8
> +; T1-NEXT: lsrs r0, r0, #24
> +; T2: tst.w
> +; T2-NEXT: it
> +; T1-NEXT: beq
> +define i32 @multi_bit_nosb(i32 %p) {
> + %a = and i32 %p, 16711680 ; 0x00ff0000
> + %b = icmp eq i32 %a, 0
> + br i1 %b, label %true, label %false
> +
> +true:
> + ret i32 1
> +
> +false:
> + ret i32 2
> +}
>
> Modified: llvm/trunk/test/CodeGen/ARM/arm-and-tst-peephole.ll
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/
> CodeGen/ARM/arm-and-tst-peephole.ll?rev=281323&r1=
> 281322&r2=281323&view=diff
> ============================================================
> ==================
> --- llvm/trunk/test/CodeGen/ARM/arm-and-tst-peephole.ll (original)
> +++ llvm/trunk/test/CodeGen/ARM/arm-and-tst-peephole.ll Tue Sep 13
> 07:12:32 2016
> @@ -28,12 +28,10 @@ tailrecurse:
> ; ARM: ands {{r[0-9]+}}, {{r[0-9]+}}, #3
> ; ARM-NEXT: beq
>
> -; THUMB: movs r[[R0:[0-9]+]], #3
> -; THUMB-NEXT: ands r[[R0]], r
> -; THUMB-NEXT: cmp r[[R0]], #0
> +; THUMB: lsls r[[R0:[0-9]+]], r{{.*}}, #30
> ; THUMB-NEXT: beq
>
> -; T2: ands {{r[0-9]+}}, {{r[0-9]+}}, #3
> +; T2: lsls r[[R0:[0-9]+]], r{{.*}}, #30
> ; T2-NEXT: beq
>
> %and = and i32 %0, 3
> @@ -93,7 +91,7 @@ entry:
> %1 = load i8, i8* %0, align 1
> %2 = zext i8 %1 to i32
> ; ARM: ands
> -; THUMB: ands
> +; THUMB: lsls
> ; T2: ands
> ; V8: ands
> ; V8-NEXT: beq
> @@ -150,10 +148,9 @@ define i32 @test_tst_assessment(i1 %lhs,
> %rhs32 = zext i1 %rhs to i32
> %diff = sub nsw i32 %lhs32, %rhs32
> ; ARM: tst r1, #1
> -; THUMB: movs [[RTMP:r[0-9]+]], #1
> -; THUMB: tst r1, [[RTMP]]
> -; T2: tst.w r1, #1
> -; V8: tst.w r1, #1
> +; THUMB: lsls r1, r1, #31
> +; T2: lsls r1, r1, #31
> +; V8: lsls r1, r1, #31
> ret i32 %diff
> }
>
>
> Modified: llvm/trunk/test/CodeGen/ARM/arm-shrink-wrapping.ll
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/
> CodeGen/ARM/arm-shrink-wrapping.ll?rev=281323&r1=
> 281322&r2=281323&view=diff
> ============================================================
> ==================
> --- llvm/trunk/test/CodeGen/ARM/arm-shrink-wrapping.ll (original)
> +++ llvm/trunk/test/CodeGen/ARM/arm-shrink-wrapping.ll Tue Sep 13
> 07:12:32 2016
> @@ -638,12 +638,12 @@ declare double @llvm.pow.f64(double, dou
> ; during PEI with shrink-wrapping enable.
> ; CHECK-LABEL: debug_info:
> ;
> -; ENABLE: tst{{(\.w)?}} r2, #1
> +; ENABLE: {{tst r2, #1|lsls r1, r2, #31}}
> ; ENABLE-NEXT: beq [[BB13:LBB[0-9_]+]]
> ;
> ; CHECK: push
> ;
> -; DISABLE: tst{{(\.w)?}} r2, #1
> +; DISABLE: {{tst r2, #1|lsls r1, r2, #31}}
> ; DISABLE-NEXT: beq [[BB13:LBB[0-9_]+]]
> ;
> ; CHECK: bl{{x?}} _pow
>
> Modified: llvm/trunk/test/CodeGen/ARM/call-tc.ll
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/
> CodeGen/ARM/call-tc.ll?rev=281323&r1=281322&r2=281323&view=diff
> ============================================================
> ==================
> --- llvm/trunk/test/CodeGen/ARM/call-tc.ll (original)
> +++ llvm/trunk/test/CodeGen/ARM/call-tc.ll Tue Sep 13 07:12:32 2016
> @@ -120,7 +120,7 @@ if.end:
> br i1 %tobool2, label %if.end5, label %if.then3
>
> if.then3: ; preds = %if.end
> -; CHECKT2D: bne.w _b
> +; CHECKT2D: bmi.w _b
> %call4 = tail call i32 @b(i32 %x) nounwind
> br label %return
>
>
> Modified: llvm/trunk/test/CodeGen/ARM/debug-info-branch-folding.ll
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/
> CodeGen/ARM/debug-info-branch-folding.ll?rev=281323&r1=
> 281322&r2=281323&view=diff
> ============================================================
> ==================
> --- llvm/trunk/test/CodeGen/ARM/debug-info-branch-folding.ll (original)
> +++ llvm/trunk/test/CodeGen/ARM/debug-info-branch-folding.ll Tue Sep 13
> 07:12:32 2016
> @@ -3,7 +3,7 @@ target datalayout = "e-p:32:32:32-i1:8:3
> target triple = "thumbv7-apple-macosx10.6.7"
>
> ;CHECK: vadd.f32 q4, q8, q8
> -;CHECK-NEXT: Ltmp1
> +;CHECK-NEXT: Ltmp
> ;CHECK-NEXT: LBB0_1
>
> ;CHECK:@DEBUG_VALUE: x <- %Q4{{$}}
>
> Modified: llvm/trunk/test/CodeGen/Thumb/thumb-shrink-wrapping.ll
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/
> CodeGen/Thumb/thumb-shrink-wrapping.ll?rev=281323&r1=
> 281322&r2=281323&view=diff
> ============================================================
> ==================
> --- llvm/trunk/test/CodeGen/Thumb/thumb-shrink-wrapping.ll (original)
> +++ llvm/trunk/test/CodeGen/Thumb/thumb-shrink-wrapping.ll Tue Sep 13
> 07:12:32 2016
> @@ -650,11 +650,14 @@ define i1 @beq_to_bx(i32* %y, i32 %head)
>
> ; CHECK: tst r3, r4
> ; ENABLE-NEXT: pop {r4}
> -; ENABLE-NEXT: pop {r3}
> -; ENABLE-NEXT: mov lr, r3
> +; ENABLE-NEXT: mov r12, r{{.*}}
> +; ENABLE-NEXT: pop {r0}
> +; ENABLE-NEXT: mov lr, r0
> +; ENABLE-NEXT: mov r0, r12
> ; CHECK-NEXT: beq [[EXIT_LABEL]]
>
> ; CHECK: str r1, [r2]
> +; CHECK: str r3, [r2]
> ; CHECK-NEXT: movs r0, #0
> ; CHECK-NEXT: [[EXIT_LABEL]]: @ %cleanup
> ; ENABLE-NEXT: bx lr
> @@ -675,6 +678,7 @@ if.end:
>
> if.end4:
> store i32 %head, i32* %y, align 4
> + store volatile i32 %z, i32* %y, align 4
> br label %cleanup
>
> cleanup:
>
> Modified: llvm/trunk/test/CodeGen/Thumb2/float-ops.ll
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/
> CodeGen/Thumb2/float-ops.ll?rev=281323&r1=281322&r2=281323&view=diff
> ============================================================
> ==================
> --- llvm/trunk/test/CodeGen/Thumb2/float-ops.ll (original)
> +++ llvm/trunk/test/CodeGen/Thumb2/float-ops.ll Tue Sep 13 07:12:32 2016
> @@ -259,9 +259,9 @@ define i64 @bitcast_d_to_i(double %a) {
>
> define float @select_f(float %a, float %b, i1 %c) {
> ; CHECK-LABEL: select_f:
> -; NONE: tst.w r2, #1
> +; NONE: lsls r2, r2, #31
> ; NONE: moveq r0, r1
> -; HARD: tst.w r0, #1
> +; HARD: lsls r0, r0, #31
> ; VFP4-ALL: vmovne.f32 s1, s0
> ; VFP4-ALL: vmov.f32 s0, s1
> ; FP-ARMv8: vseleq.f32 s0, s1, s0
> @@ -271,18 +271,18 @@ define float @select_f(float %a, float %
>
> define double @select_d(double %a, double %b, i1 %c) {
> ; CHECK-LABEL: select_d:
> -; NONE: ldr.w [[REG:r[0-9]+]], [sp]
> -; NONE: ands [[REG]], [[REG]], #1
> +; NONE: ldr{{(.w)?}} [[REG:r[0-9]+]], [sp]
> +; NONE: lsls{{(.w)?}} [[REG]], [[REG]], #31
> ; NONE: moveq r0, r2
> ; NONE: moveq r1, r3
> -; SP: ands r0, r0, #1
> +; SP: lsls r0, r0, #31
> ; SP-DAG: vmov [[ALO:r[0-9]+]], [[AHI:r[0-9]+]], d0
> ; SP-DAG: vmov [[BLO:r[0-9]+]], [[BHI:r[0-9]+]], d1
> ; SP: itt ne
> ; SP-DAG: movne [[BLO]], [[ALO]]
> ; SP-DAG: movne [[BHI]], [[AHI]]
> ; SP: vmov d0, [[BLO]], [[BHI]]
> -; DP: tst.w r0, #1
> +; DP: lsls r0, r0, #31
> ; VFP4-DP: vmovne.f64 d1, d0
> ; VFP4-DP: vmov.f64 d0, d1
> ; FP-ARMV8: vseleq.f64 d0, d1, d0
>
>
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