1//===----------------------Hexagon builtin routine ------------------------===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8 9 10 .macro FUNCTION_BEGIN name 11 .text 12 .p2align 5 13 .globl \name 14 .type \name, @function 15\name: 16 .endm 17 18 .macro FUNCTION_END name 19 .size \name, . - \name 20 .endm 21 22 23FUNCTION_BEGIN __hexagon_udivmoddi4 24 { 25 r6 = cl0(r1:0) // count leading 0's of dividend (numerator) 26 r7 = cl0(r3:2) // count leading 0's of divisor (denominator) 27 r5:4 = r3:2 // divisor moved into working registers 28 r3:2 = r1:0 // dividend is the initial remainder, r3:2 contains remainder 29 } 30 { 31 r10 = sub(r7,r6) // left shift count for bit & divisor 32 r1:0 = #0 // initialize quotient to 0 33 r15:14 = #1 // initialize bit to 1 34 } 35 { 36 r11 = add(r10,#1) // loop count is 1 more than shift count 37 r13:12 = lsl(r5:4,r10) // shift divisor msb into same bit position as dividend msb 38 r15:14 = lsl(r15:14,r10) // shift the bit left by same amount as divisor 39 } 40 { 41 p0 = cmp.gtu(r5:4,r3:2) // check if divisor > dividend 42 loop0(1f,r11) // register loop 43 } 44 { 45 if (p0) jumpr r31 // if divisor > dividend, we're done, so return 46 } 47 .falign 481: 49 { 50 p0 = cmp.gtu(r13:12,r3:2) // set predicate reg if shifted divisor > current remainder 51 } 52 { 53 r7:6 = sub(r3:2, r13:12) // subtract shifted divisor from current remainder 54 r9:8 = add(r1:0, r15:14) // save current quotient to temp (r9:8) 55 } 56 { 57 r1:0 = vmux(p0, r1:0, r9:8) // choose either current quotient or new quotient (r9:8) 58 r3:2 = vmux(p0, r3:2, r7:6) // choose either current remainder or new remainder (r7:6) 59 } 60 { 61 r15:14 = lsr(r15:14, #1) // shift bit right by 1 for next iteration 62 r13:12 = lsr(r13:12, #1) // shift "shifted divisor" right by 1 for next iteration 63 }:endloop0 64 { 65 jumpr r31 // return 66 } 67FUNCTION_END __hexagon_udivmoddi4 68 69 .globl __qdsp_udivmoddi4 70 .set __qdsp_udivmoddi4, __hexagon_udivmoddi4 71