45 lines
1.2 KiB
ArmAsm
45 lines
1.2 KiB
ArmAsm
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "textflag.h"
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// Documentation is available in parameters.go.
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//
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// func muldiv64(value, multiplier, divisor uint64) (uint64, bool)
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TEXT ·muldiv64(SB),NOSPLIT,$40-33
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MOVD value+0(FP), R0
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MOVD multiplier+8(FP), R1
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MOVD divisor+16(FP), R2
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UMULH R0, R1, R3
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MUL R0, R1, R4
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CMP R2, R3
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BHS overflow
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MOVD R3, 8(RSP)
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MOVD R4, 16(RSP)
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MOVD R2, 24(RSP)
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CALL ·divWW(SB)
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MOVD 32(RSP), R0
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MOVD R0, result+24(FP)
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MOVD $1, R0
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MOVB R0, ok+32(FP)
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RET
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overflow:
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MOVD ZR, result+24(FP)
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MOVB ZR, ok+32(FP)
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RET
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