1 // Copyright 2016 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 // +build !math_big_pure_go,ppc64le 6 7 #include "textflag.h" 8 9 // This file provides fast assembly versions for the elementary 10 // arithmetic operations on vectors implemented in arith.go. 11 12 // func divWW(x1, x0, y Word) (q, r Word) 13 TEXT divWW(SB), NOSPLIT, $0 14 MOVD x1+0(FP), R4 15 MOVD x0+8(FP), R5 16 MOVD y+16(FP), R6 17 18 CMPU R4, R6 19 BGE divbigger 20 21 // from the programmer's note in ch. 3 of the ISA manual, p.74 22 DIVDEU R6, R4, R3 23 DIVDU R6, R5, R7 24 MULLD R6, R3, R8 25 MULLD R6, R7, R20 26 SUB R20, R5, R10 27 ADD R7, R3, R3 28 SUB R8, R10, R4 29 CMPU R4, R10 30 BLT adjust 31 CMPU R4, R6 32 BLT end 33 34 adjust: 35 MOVD $1, R21 36 ADD R21, R3, R3 37 SUB R6, R4, R4 38 39 end: 40 MOVD R3, q+24(FP) 41 MOVD R4, r+32(FP) 42 43 RET 44 45 divbigger: 46 MOVD $-1, R7 47 MOVD R7, q+24(FP) 48 MOVD R7, r+32(FP) 49 RET 50 51
