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llvm-mirror/test/CodeGen/ARM/lsr-setupcost.ll

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[LSR] Attempt to increase the accuracy of LSR's setup cost In some loops, we end up generating loop induction variables that look like: {(-1 * (zext i16 (%i0 * %i1) to i32))<nsw>,+,1} As opposed to the simpler: {(zext i16 (%i0 * %i1) to i32),+,-1} i.e we count up from -limit to 0, not the simpler counting down from limit to 0. This is because the scores, as LSR calculates them, are the same and the second is filtered in place of the first. We end up with a redundant SUB from 0 in the code. This patch tries to make the calculation of the setup cost a little more thoroughly, recursing into the scev members to better approximate the setup required. The cost function for comparing LSR costs is: return std::tie(C1.NumRegs, C1.AddRecCost, C1.NumIVMuls, C1.NumBaseAdds, C1.ScaleCost, C1.ImmCost, C1.SetupCost) < std::tie(C2.NumRegs, C2.AddRecCost, C2.NumIVMuls, C2.NumBaseAdds, C2.ScaleCost, C2.ImmCost, C2.SetupCost); So this will only alter results if none of the other variables turn out to be different. Differential Revision: https://reviews.llvm.org/D58770 llvm-svn: 355597
2019-03-07 14:44:40 +01:00
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -mtriple=thumbv6m-none-eabi -loop-reduce %s -S -o - | FileCheck %s
target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
%struct.arm_matrix_instance_q15 = type { i16, i16, i16* }
define i32 @arm_mat_add_q15(%struct.arm_matrix_instance_q15* nocapture readonly %pSrcA, %struct.arm_matrix_instance_q15* nocapture readonly %pSrcB, %struct.arm_matrix_instance_q15* nocapture readonly %pDst) {
; CHECK-LABEL: @arm_mat_add_q15(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[NUMROWS:%.*]] = getelementptr inbounds [[STRUCT_ARM_MATRIX_INSTANCE_Q15:%.*]], %struct.arm_matrix_instance_q15* [[PSRCA:%.*]], i32 0, i32 0
; CHECK-NEXT: [[I0:%.*]] = load i16, i16* [[NUMROWS]], align 4
; CHECK-NEXT: [[NUMCOLS:%.*]] = getelementptr inbounds [[STRUCT_ARM_MATRIX_INSTANCE_Q15]], %struct.arm_matrix_instance_q15* [[PSRCA]], i32 0, i32 1
; CHECK-NEXT: [[I1:%.*]] = load i16, i16* [[NUMCOLS]], align 2
; CHECK-NEXT: [[MUL:%.*]] = mul i16 [[I1]], [[I0]]
; CHECK-NEXT: [[CMP22:%.*]] = icmp eq i16 [[MUL]], 0
; CHECK-NEXT: br i1 [[CMP22]], label [[WHILE_END:%.*]], label [[WHILE_BODY_PREHEADER:%.*]]
; CHECK: while.body.preheader:
; CHECK-NEXT: [[CONV5:%.*]] = zext i16 [[MUL]] to i32
; CHECK-NEXT: [[PDATA2:%.*]] = getelementptr inbounds [[STRUCT_ARM_MATRIX_INSTANCE_Q15]], %struct.arm_matrix_instance_q15* [[PDST:%.*]], i32 0, i32 2
; CHECK-NEXT: [[I2:%.*]] = load i16*, i16** [[PDATA2]], align 4
; CHECK-NEXT: [[PDATA1:%.*]] = getelementptr inbounds [[STRUCT_ARM_MATRIX_INSTANCE_Q15]], %struct.arm_matrix_instance_q15* [[PSRCB:%.*]], i32 0, i32 2
; CHECK-NEXT: [[I3:%.*]] = load i16*, i16** [[PDATA1]], align 4
; CHECK-NEXT: [[PDATA:%.*]] = getelementptr inbounds [[STRUCT_ARM_MATRIX_INSTANCE_Q15]], %struct.arm_matrix_instance_q15* [[PSRCA]], i32 0, i32 2
; CHECK-NEXT: [[I4:%.*]] = load i16*, i16** [[PDATA]], align 4
; CHECK-NEXT: br label [[WHILE_BODY:%.*]]
; CHECK: while.body:
; CHECK-NEXT: [[PINA_026:%.*]] = phi i16* [ [[INCDEC_PTR:%.*]], [[WHILE_BODY]] ], [ [[I4]], [[WHILE_BODY_PREHEADER]] ]
; CHECK-NEXT: [[BLKCNT_025:%.*]] = phi i32 [ [[DEC:%.*]], [[WHILE_BODY]] ], [ [[CONV5]], [[WHILE_BODY_PREHEADER]] ]
; CHECK-NEXT: [[PINB_024:%.*]] = phi i16* [ [[INCDEC_PTR8:%.*]], [[WHILE_BODY]] ], [ [[I3]], [[WHILE_BODY_PREHEADER]] ]
; CHECK-NEXT: [[POUT_023:%.*]] = phi i16* [ [[INCDEC_PTR11:%.*]], [[WHILE_BODY]] ], [ [[I2]], [[WHILE_BODY_PREHEADER]] ]
; CHECK-NEXT: [[INCDEC_PTR]] = getelementptr inbounds i16, i16* [[PINA_026]], i32 1
; CHECK-NEXT: [[I5:%.*]] = load i16, i16* [[PINA_026]], align 2
; CHECK-NEXT: [[CONV7:%.*]] = sext i16 [[I5]] to i32
; CHECK-NEXT: [[INCDEC_PTR8]] = getelementptr inbounds i16, i16* [[PINB_024]], i32 1
; CHECK-NEXT: [[I6:%.*]] = load i16, i16* [[PINB_024]], align 2
; CHECK-NEXT: [[CONV9:%.*]] = sext i16 [[I6]] to i32
; CHECK-NEXT: [[ADD:%.*]] = add nsw i32 [[CONV9]], [[CONV7]]
; CHECK-NEXT: [[I7:%.*]] = icmp sgt i32 [[ADD]], -32768
; CHECK-NEXT: [[SPEC_SELECT_I:%.*]] = select i1 [[I7]], i32 [[ADD]], i32 -32768
; CHECK-NEXT: [[I8:%.*]] = icmp slt i32 [[SPEC_SELECT_I]], 32767
; CHECK-NEXT: [[CALL21:%.*]] = select i1 [[I8]], i32 [[SPEC_SELECT_I]], i32 32767
; CHECK-NEXT: [[CONV10:%.*]] = trunc i32 [[CALL21]] to i16
; CHECK-NEXT: [[INCDEC_PTR11]] = getelementptr inbounds i16, i16* [[POUT_023]], i32 1
; CHECK-NEXT: store i16 [[CONV10]], i16* [[POUT_023]], align 2
; CHECK-NEXT: [[DEC]] = add nsw i32 [[BLKCNT_025]], -1
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[DEC]], 0
; CHECK-NEXT: br i1 [[CMP]], label [[WHILE_END_LOOPEXIT:%.*]], label [[WHILE_BODY]]
; CHECK: while.end.loopexit:
; CHECK-NEXT: br label [[WHILE_END]]
; CHECK: while.end:
; CHECK-NEXT: ret i32 0
;
entry:
%numRows = getelementptr inbounds %struct.arm_matrix_instance_q15, %struct.arm_matrix_instance_q15* %pSrcA, i32 0, i32 0
%i0 = load i16, i16* %numRows, align 4
%numCols = getelementptr inbounds %struct.arm_matrix_instance_q15, %struct.arm_matrix_instance_q15* %pSrcA, i32 0, i32 1
%i1 = load i16, i16* %numCols, align 2
%mul = mul i16 %i1, %i0
%cmp22 = icmp eq i16 %mul, 0
br i1 %cmp22, label %while.end, label %while.body.preheader
while.body.preheader: ; preds = %entry
%conv5 = zext i16 %mul to i32
%pData2 = getelementptr inbounds %struct.arm_matrix_instance_q15, %struct.arm_matrix_instance_q15* %pDst, i32 0, i32 2
%i2 = load i16*, i16** %pData2, align 4
%pData1 = getelementptr inbounds %struct.arm_matrix_instance_q15, %struct.arm_matrix_instance_q15* %pSrcB, i32 0, i32 2
%i3 = load i16*, i16** %pData1, align 4
%pData = getelementptr inbounds %struct.arm_matrix_instance_q15, %struct.arm_matrix_instance_q15* %pSrcA, i32 0, i32 2
%i4 = load i16*, i16** %pData, align 4
br label %while.body
while.body: ; preds = %while.body.preheader, %while.body
%pInA.026 = phi i16* [ %incdec.ptr, %while.body ], [ %i4, %while.body.preheader ]
%blkCnt.025 = phi i32 [ %dec, %while.body ], [ %conv5, %while.body.preheader ]
%pInB.024 = phi i16* [ %incdec.ptr8, %while.body ], [ %i3, %while.body.preheader ]
%pOut.023 = phi i16* [ %incdec.ptr11, %while.body ], [ %i2, %while.body.preheader ]
%incdec.ptr = getelementptr inbounds i16, i16* %pInA.026, i32 1
%i5 = load i16, i16* %pInA.026, align 2
%conv7 = sext i16 %i5 to i32
%incdec.ptr8 = getelementptr inbounds i16, i16* %pInB.024, i32 1
%i6 = load i16, i16* %pInB.024, align 2
%conv9 = sext i16 %i6 to i32
%add = add nsw i32 %conv9, %conv7
%i7 = icmp sgt i32 %add, -32768
%spec.select.i = select i1 %i7, i32 %add, i32 -32768
%i8 = icmp slt i32 %spec.select.i, 32767
%call21 = select i1 %i8, i32 %spec.select.i, i32 32767
%conv10 = trunc i32 %call21 to i16
%incdec.ptr11 = getelementptr inbounds i16, i16* %pOut.023, i32 1
store i16 %conv10, i16* %pOut.023, align 2
%dec = add nsw i32 %blkCnt.025, -1
%cmp = icmp eq i32 %dec, 0
br i1 %cmp, label %while.end, label %while.body
while.end: ; preds = %while.body, %entry
ret i32 0
}
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