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clang-p2996/llvm/test/CodeGen/ARM/ParallelDSP/smladx-1.ll
Sam Parker a33e311a3b [ARM][ParallelDSP] Relax alias checks 
When deciding the safety of generating smlad, we checked for any
writes within the block that may alias with any of the loads that
need to be widened. This is overly conservative because it only
matters when there's a potential aliasing write to a location
accessed by a pair of loads.

Now we check for aliasing writes only once, during setup. If two
loads are found to have an aliasing write between them, we don't add
these loads to LoadPairs. This means that later during the transform,
we can safely widened a pair without worrying about aliasing.

However, to maintain correctness, we also need to change the way that
wide loads are inserted because the order is now important.

The MatchSMLAD method has also been changed, absorbing
MatchReductions and AddMACCandidate to hopefully improve readability.

Differential Revision: https://reviews.llvm.org/D6102

llvm-svn: 360567
2019-05-13 09:23:32 +00:00

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; RUN: opt -mtriple=thumbv8m.main -mcpu=cortex-m33 -arm-parallel-dsp %s -S -o - | FileCheck %s
; RUN: opt -mtriple=arm-arm-eabi -mcpu=cortex-m0 < %s -arm-parallel-dsp -S | FileCheck %s --check-prefix=CHECK-UNSUPPORTED
; RUN: opt -mtriple=arm-arm-eabi -mcpu=cortex-m33 -mattr=-dsp < %s -arm-parallel-dsp -S | FileCheck %s --check-prefix=CHECK-UNSUPPORTED
; RUN: opt -mtriple=armeb-arm-eabi -mcpu=cortex-m33 < %s -arm-parallel-dsp -S | FileCheck %s --check-prefix=CHECK-UNSUPPORTED
define i32 @smladx(i16* nocapture readonly %pIn1, i16* nocapture readonly %pIn2, i32 %j, i32 %limit) {
; CHECK-LABEL: smladx
; CHECK: = phi i32 [ 0, %for.body.preheader.new ],
; CHECK: [[ACC0:%[^ ]+]] = phi i32 [ 0, %for.body.preheader.new ], [ [[ACC2:%[^ ]+]], %for.body ]
; CHECK: [[PIN21:%[^ ]+]] = bitcast i16* %pIn2.1 to i32*
; CHECK: [[IN21:%[^ ]+]] = load i32, i32* [[PIN21]], align 2
; CHECK: [[PIN10:%[^ ]+]] = bitcast i16* %pIn1.0 to i32*
; CHECK: [[IN10:%[^ ]+]] = load i32, i32* [[PIN10]], align 2
; CHECK: [[PIN23:%[^ ]+]] = bitcast i16* %pIn2.3 to i32*
; CHECK: [[IN23:%[^ ]+]] = load i32, i32* [[PIN23]], align 2
; CHECK: [[PIN12:%[^ ]+]] = bitcast i16* %pIn1.2 to i32*
; CHECK: [[IN12:%[^ ]+]] = load i32, i32* [[PIN12]], align 2
; CHECK: [[ACC1:%[^ ]+]] = call i32 @llvm.arm.smladx(i32 [[IN23]], i32 [[IN12]], i32 [[ACC0]])
; CHECK: [[ACC2]] = call i32 @llvm.arm.smladx(i32 [[IN21]], i32 [[IN10]], i32 [[ACC1]])
; CHECK-NOT: call i32 @llvm.arm.smlad
; CHECK-UNSUPPORTED-NOT: call i32 @llvm.arm.smlad
entry:
%cmp9 = icmp eq i32 %limit, 0
br i1 %cmp9, label %for.cond.cleanup, label %for.body.preheader
for.body.preheader:
%0 = add i32 %limit, -1
%xtraiter = and i32 %limit, 3
%1 = icmp ult i32 %0, 3
br i1 %1, label %for.cond.cleanup.loopexit.unr-lcssa, label %for.body.preheader.new
for.body.preheader.new:
%unroll_iter = sub i32 %limit, %xtraiter
br label %for.body
for.cond.cleanup.loopexit.unr-lcssa:
%add.lcssa.ph = phi i32 [ undef, %for.body.preheader ], [ %add.3, %for.body ]
%i.011.unr = phi i32 [ 0, %for.body.preheader ], [ %inc.3, %for.body ]
%sum.010.unr = phi i32 [ 0, %for.body.preheader ], [ %add.3, %for.body ]
%lcmp.mod = icmp eq i32 %xtraiter, 0
br i1 %lcmp.mod, label %for.cond.cleanup, label %for.body.epil
for.body.epil:
%i.011.epil = phi i32 [ %inc.epil, %for.body.epil ], [ %i.011.unr, %for.cond.cleanup.loopexit.unr-lcssa ]
%sum.010.epil = phi i32 [ %add.epil, %for.body.epil ], [ %sum.010.unr, %for.cond.cleanup.loopexit.unr-lcssa ]
%epil.iter = phi i32 [ %epil.iter.sub, %for.body.epil ], [ %xtraiter, %for.cond.cleanup.loopexit.unr-lcssa ]
%sub.epil = sub i32 %j, %i.011.epil
%arrayidx.epil = getelementptr inbounds i16, i16* %pIn2, i32 %sub.epil
%2 = load i16, i16* %arrayidx.epil, align 2
%conv.epil = sext i16 %2 to i32
%arrayidx1.epil = getelementptr inbounds i16, i16* %pIn1, i32 %i.011.epil
%3 = load i16, i16* %arrayidx1.epil, align 2
%conv2.epil = sext i16 %3 to i32
%mul.epil = mul nsw i32 %conv2.epil, %conv.epil
%add.epil = add nsw i32 %mul.epil, %sum.010.epil
%inc.epil = add nuw i32 %i.011.epil, 1
%epil.iter.sub = add i32 %epil.iter, -1
%epil.iter.cmp = icmp eq i32 %epil.iter.sub, 0
br i1 %epil.iter.cmp, label %for.cond.cleanup, label %for.body.epil
for.cond.cleanup:
%sum.0.lcssa = phi i32 [ 0, %entry ], [ %add.lcssa.ph, %for.cond.cleanup.loopexit.unr-lcssa ], [ %add.epil, %for.body.epil ]
ret i32 %sum.0.lcssa
for.body:
%i.011 = phi i32 [ 0, %for.body.preheader.new ], [ %inc.3, %for.body ]
%sum.010 = phi i32 [ 0, %for.body.preheader.new ], [ %add.3, %for.body ]
%niter = phi i32 [ %unroll_iter, %for.body.preheader.new ], [ %niter.nsub.3, %for.body ]
%pIn2Base = phi i16* [ %pIn2, %for.body.preheader.new ], [ %pIn2.4, %for.body ]
%pIn2.0 = getelementptr inbounds i16, i16* %pIn2Base, i32 0
%In2 = load i16, i16* %pIn2.0, align 2
%pIn1.0 = getelementptr inbounds i16, i16* %pIn1, i32 %i.011
%In1 = load i16, i16* %pIn1.0, align 2
%inc = or i32 %i.011, 1
%pIn2.1 = getelementptr inbounds i16, i16* %pIn2Base, i32 -1
%In2.1 = load i16, i16* %pIn2.1, align 2
%pIn1.1 = getelementptr inbounds i16, i16* %pIn1, i32 %inc
%In1.1 = load i16, i16* %pIn1.1, align 2
%inc.1 = or i32 %i.011, 2
%pIn2.2 = getelementptr inbounds i16, i16* %pIn2Base, i32 -2
%In2.2 = load i16, i16* %pIn2.2, align 2
%pIn1.2 = getelementptr inbounds i16, i16* %pIn1, i32 %inc.1
%In1.2 = load i16, i16* %pIn1.2, align 2
%inc.2 = or i32 %i.011, 3
%pIn2.3 = getelementptr inbounds i16, i16* %pIn2Base, i32 -3
%In2.3 = load i16, i16* %pIn2.3, align 2
%pIn1.3 = getelementptr inbounds i16, i16* %pIn1, i32 %inc.2
%In1.3 = load i16, i16* %pIn1.3, align 2
%sextIn1 = sext i16 %In1 to i32
%sextIn1.1 = sext i16 %In1.1 to i32
%sextIn1.2 = sext i16 %In1.2 to i32
%sextIn1.3 = sext i16 %In1.3 to i32
%sextIn2 = sext i16 %In2 to i32
%sextIn2.1 = sext i16 %In2.1 to i32
%sextIn2.2 = sext i16 %In2.2 to i32
%sextIn2.3 = sext i16 %In2.3 to i32
%mul = mul nsw i32 %sextIn1, %sextIn2
%mul.1 = mul nsw i32 %sextIn1.1, %sextIn2.1
%mul.2 = mul nsw i32 %sextIn1.2, %sextIn2.2
%mul.3 = mul nsw i32 %sextIn1.3, %sextIn2.3
%add = add nsw i32 %mul, %sum.010
%add.1 = add nsw i32 %mul.1, %add
%add.2 = add nsw i32 %mul.2, %add.1
%add.3 = add nsw i32 %mul.3, %add.2
%inc.3 = add i32 %i.011, 4
%pIn2.4 = getelementptr inbounds i16, i16* %pIn2Base, i32 -4
%niter.nsub.3 = add i32 %niter, -4
%niter.ncmp.3 = icmp eq i32 %niter.nsub.3, 0
br i1 %niter.ncmp.3, label %for.cond.cleanup.loopexit.unr-lcssa, label %for.body
}
define i32 @smladx_swap(i16* nocapture readonly %pIn1, i16* nocapture readonly %pIn2, i32 %j, i32 %limit) {
; CHECK-LABEL: smladx_swap
; CHECK: for.body.preheader.new:
; CHECK: [[PIN1Base:[^ ]+]] = getelementptr i16, i16* %pIn1
; CHECK: [[PIN2Base:[^ ]+]] = getelementptr i16, i16* %pIn2
; CHECK: for.body:
; CHECK: [[PIN2:%[^ ]+]] = phi i16* [ [[PIN2_NEXT:%[^ ]+]], %for.body ], [ [[PIN2Base]], %for.body.preheader.new ]
; CHECK: [[PIN1:%[^ ]+]] = phi i16* [ [[PIN1_NEXT:%[^ ]+]], %for.body ], [ [[PIN1Base]], %for.body.preheader.new ]
; CHECK: [[IV:%[^ ]+]] = phi i32
; CHECK: [[ACC0:%[^ ]+]] = phi i32 [ 0, %for.body.preheader.new ], [ [[ACC2:%[^ ]+]], %for.body ]
; CHECK: [[PIN2_CAST:%[^ ]+]] = bitcast i16* [[PIN2]] to i32*
; CHECK: [[IN2:%[^ ]+]] = load i32, i32* [[PIN2_CAST]], align 2
; CHECK: [[PIN1_2:%[^ ]+]] = getelementptr i16, i16* [[PIN1]], i32 -2
; CHECK: [[PIN1_2_CAST:%[^ ]+]] = bitcast i16* [[PIN1_2]] to i32*
; CHECK: [[IN1_2:%[^ ]+]] = load i32, i32* [[PIN1_2_CAST]], align 2
; CHECK: [[PIN2_2:%[^ ]+]] = getelementptr i16, i16* [[PIN2]], i32 -2
; CHECK: [[PIN2_2_CAST:%[^ ]+]] = bitcast i16* [[PIN2_2]] to i32*
; CHECK: [[IN2_2:%[^ ]+]] = load i32, i32* [[PIN2_2_CAST]], align 2
; CHECK: [[PIN1_CAST:%[^ ]+]] = bitcast i16* [[PIN1]] to i32*
; CHECK: [[IN1:%[^ ]+]] = load i32, i32* [[PIN1_CAST]], align 2
; CHECK: [[ACC1:%[^ ]+]] = call i32 @llvm.arm.smladx(i32 [[IN2_2]], i32 [[IN1]], i32 [[ACC0]])
; CHECK: [[ACC2]] = call i32 @llvm.arm.smladx(i32 [[IN2]], i32 [[IN1_2]], i32 [[ACC1]])
; CHECK: [[PIN1_NEXT]] = getelementptr i16, i16* [[PIN1]], i32 4
; CHECK: [[PIN2_NEXT]] = getelementptr i16, i16* [[PIN2]], i32 -4
; CHECK-NOT: call i32 @llvm.arm.smlad
; CHECK-UNSUPPORTED-NOT: call i32 @llvm.arm.smlad
entry:
%cmp9 = icmp eq i32 %limit, 0
br i1 %cmp9, label %for.cond.cleanup, label %for.body.preheader
for.body.preheader:
%0 = add i32 %limit, -1
%xtraiter = and i32 %limit, 3
%1 = icmp ult i32 %0, 3
br i1 %1, label %for.cond.cleanup.loopexit.unr-lcssa, label %for.body.preheader.new
for.body.preheader.new:
%unroll_iter = sub i32 %limit, %xtraiter
%scevgep6 = getelementptr i16, i16* %pIn1, i32 2
%2 = add i32 %j, -1
%scevgep11 = getelementptr i16, i16* %pIn2, i32 %2
br label %for.body
for.cond.cleanup.loopexit.unr-lcssa:
%add.lcssa.ph = phi i32 [ undef, %for.body.preheader ], [ %add.3, %for.body ]
%i.011.unr = phi i32 [ 0, %for.body.preheader ], [ %inc.3, %for.body ]
%sum.010.unr = phi i32 [ 0, %for.body.preheader ], [ %add.3, %for.body ]
%lcmp.mod = icmp eq i32 %xtraiter, 0
br i1 %lcmp.mod, label %for.cond.cleanup, label %for.body.epil.preheader
for.body.epil.preheader:
%scevgep = getelementptr i16, i16* %pIn1, i32 %i.011.unr
%3 = sub i32 %j, %i.011.unr
%scevgep2 = getelementptr i16, i16* %pIn2, i32 %3
%4 = sub i32 0, %xtraiter
br label %for.body.epil
for.body.epil:
%lsr.iv5 = phi i32 [ %4, %for.body.epil.preheader ], [ %lsr.iv.next, %for.body.epil ]
%lsr.iv3 = phi i16* [ %scevgep2, %for.body.epil.preheader ], [ %scevgep4, %for.body.epil ]
%lsr.iv = phi i16* [ %scevgep, %for.body.epil.preheader ], [ %scevgep1, %for.body.epil ]
%sum.010.epil = phi i32 [ %add.epil, %for.body.epil ], [ %sum.010.unr, %for.body.epil.preheader ]
%5 = load i16, i16* %lsr.iv3, align 2
%conv.epil = sext i16 %5 to i32
%6 = load i16, i16* %lsr.iv, align 2
%conv2.epil = sext i16 %6 to i32
%mul.epil = mul nsw i32 %conv2.epil, %conv.epil
%add.epil = add nsw i32 %mul.epil, %sum.010.epil
%scevgep1 = getelementptr i16, i16* %lsr.iv, i32 1
%scevgep4 = getelementptr i16, i16* %lsr.iv3, i32 -1
%lsr.iv.next = add nsw i32 %lsr.iv5, 1
%epil.iter.cmp = icmp eq i32 %lsr.iv.next, 0
br i1 %epil.iter.cmp, label %for.cond.cleanup, label %for.body.epil
for.cond.cleanup:
%sum.0.lcssa = phi i32 [ 0, %entry ], [ %add.lcssa.ph, %for.cond.cleanup.loopexit.unr-lcssa ], [ %add.epil, %for.body.epil ]
ret i32 %sum.0.lcssa
for.body:
%pin2 = phi i16* [ %pin2_sub4, %for.body ], [ %scevgep11, %for.body.preheader.new ]
%pin1 = phi i16* [ %pin1_add4, %for.body ], [ %scevgep6, %for.body.preheader.new ]
%i.011 = phi i32 [ 0, %for.body.preheader.new ], [ %inc.3, %for.body ]
%sum.010 = phi i32 [ 0, %for.body.preheader.new ], [ %add.3, %for.body ]
%pin2_add1 = getelementptr i16, i16* %pin2, i32 1
%In2 = load i16, i16* %pin2_add1, align 2
%pin1_sub2 = getelementptr i16, i16* %pin1, i32 -2
%In1 = load i16, i16* %pin1_sub2, align 2
%In2.1 = load i16, i16* %pin2, align 2
%pin1_sub1 = getelementptr i16, i16* %pin1, i32 -1
%In1.1 = load i16, i16* %pin1_sub1, align 2
%pin2_sub1 = getelementptr i16, i16* %pin2, i32 -1
%In2.2 = load i16, i16* %pin2_sub1, align 2
%In1.2 = load i16, i16* %pin1, align 2
%pin2_sub2 = getelementptr i16, i16* %pin2, i32 -2
%In2.3 = load i16, i16* %pin2_sub2, align 2
%pin1_add1 = getelementptr i16, i16* %pin1, i32 1
%In1.3 = load i16, i16* %pin1_add1, align 2
%sextIn2 = sext i16 %In2 to i32
%sextIn1 = sext i16 %In1 to i32
%sextIn2.1 = sext i16 %In2.1 to i32
%sextIn1.1 = sext i16 %In1.1 to i32
%sextIn2.2 = sext i16 %In2.2 to i32
%sextIn1.2 = sext i16 %In1.2 to i32
%sextIn2.3 = sext i16 %In2.3 to i32
%sextIn1.3 = sext i16 %In1.3 to i32
%mul = mul nsw i32 %sextIn2, %sextIn1
%add = add nsw i32 %mul, %sum.010
%mul.1 = mul nsw i32 %sextIn2.1, %sextIn1.1
%add.1 = add nsw i32 %mul.1, %add
%mul.2 = mul nsw i32 %sextIn2.2, %sextIn1.2
%add.2 = add nsw i32 %mul.2, %add.1
%mul.3 = mul nsw i32 %sextIn2.3, %sextIn1.3
%add.3 = add nsw i32 %mul.3, %add.2
%inc.3 = add i32 %i.011, 4
%pin1_add4 = getelementptr i16, i16* %pin1, i32 4
%pin2_sub4 = getelementptr i16, i16* %pin2, i32 -4
%niter.ncmp.3 = icmp eq i32 %unroll_iter, %inc.3
br i1 %niter.ncmp.3, label %for.cond.cleanup.loopexit.unr-lcssa, label %for.body
}
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