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author | Maxim Yurchuk <maxim-yurchuk@ydb.tech> | 2024-10-18 20:31:38 +0300 |
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committer | GitHub <noreply@github.com> | 2024-10-18 20:31:38 +0300 |
commit | 2a74bac2d2d3bccb4e10120f1ead805640ec9dd0 (patch) | |
tree | 047e4818ced5aaf73f58517629e5260b5291f9f0 /contrib/libs/cxxsupp/builtins/hexagon/divdi3.S | |
parent | 2d9656823e9521d8c29ea4c9a1d0eab78391abfc (diff) | |
parent | 3d834a1923bbf9403cd4a448e7f32b670aa4124f (diff) | |
download | ydb-2a74bac2d2d3bccb4e10120f1ead805640ec9dd0.tar.gz |
Merge pull request #10502 from ydb-platform/mergelibs-241016-1210
Library import 241016-1210
Diffstat (limited to 'contrib/libs/cxxsupp/builtins/hexagon/divdi3.S')
-rw-r--r-- | contrib/libs/cxxsupp/builtins/hexagon/divdi3.S | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/contrib/libs/cxxsupp/builtins/hexagon/divdi3.S b/contrib/libs/cxxsupp/builtins/hexagon/divdi3.S new file mode 100644 index 0000000000..770601a470 --- /dev/null +++ b/contrib/libs/cxxsupp/builtins/hexagon/divdi3.S @@ -0,0 +1,84 @@ +//===----------------------Hexagon builtin routine ------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + + .macro FUNCTION_BEGIN name + .text + .p2align 5 + .globl \name + .type \name, @function +\name: + .endm + + .macro FUNCTION_END name + .size \name, . - \name + .endm + + +FUNCTION_BEGIN __hexagon_divdi3 + { + p2 = tstbit(r1,#31) + p3 = tstbit(r3,#31) + } + { + r1:0 = abs(r1:0) + r3:2 = abs(r3:2) + } + { + r6 = cl0(r1:0) // count leading 0's of dividend (numerator) + r7 = cl0(r3:2) // count leading 0's of divisor (denominator) + r5:4 = r3:2 // divisor moved into working registers + r3:2 = r1:0 // dividend is the initial remainder, r3:2 contains remainder + } + { + p3 = xor(p2,p3) + r10 = sub(r7,r6) // left shift count for bit & divisor + r1:0 = #0 // initialize quotient to 0 + r15:14 = #1 // initialize bit to 1 + } + { + r11 = add(r10,#1) // loop count is 1 more than shift count + r13:12 = lsl(r5:4,r10) // shift divisor msb into same bit position as dividend msb + r15:14 = lsl(r15:14,r10) // shift the bit left by same amount as divisor + } + { + p0 = cmp.gtu(r5:4,r3:2) // check if divisor > dividend + loop0(1f,r11) // register loop + } + { + if (p0) jump .hexagon_divdi3_return // if divisor > dividend, we're done, so return + } + .falign +1: + { + p0 = cmp.gtu(r13:12,r3:2) // set predicate reg if shifted divisor > current remainder + } + { + r7:6 = sub(r3:2, r13:12) // subtract shifted divisor from current remainder + r9:8 = add(r1:0, r15:14) // save current quotient to temp (r9:8) + } + { + r1:0 = vmux(p0, r1:0, r9:8) // choose either current quotient or new quotient (r9:8) + r3:2 = vmux(p0, r3:2, r7:6) // choose either current remainder or new remainder (r7:6) + } + { + r15:14 = lsr(r15:14, #1) // shift bit right by 1 for next iteration + r13:12 = lsr(r13:12, #1) // shift "shifted divisor" right by 1 for next iteration + }:endloop0 + +.hexagon_divdi3_return: + { + r3:2 = neg(r1:0) + } + { + r1:0 = vmux(p3,r3:2,r1:0) + jumpr r31 + } +FUNCTION_END __hexagon_divdi3 + + .globl __qdsp_divdi3 + .set __qdsp_divdi3, __hexagon_divdi3 |