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Eliminate ToArray bounds checks#81001

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stephentoub merged 2 commits into
dotnet:mainfrom
xtqqczze:patch-1
Jan 23, 2023
Merged

Eliminate ToArray bounds checks#81001
stephentoub merged 2 commits into
dotnet:mainfrom
xtqqczze:patch-1

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@xtqqczze xtqqczze commented Jan 22, 2023 •
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See #80633 (comment):

// crossgen2 8.0.0-alpha.1.23061.99+71bb0d481086b8b8a89a99a17ec80a861f32dc5d

C:ToArray_Base():int[]:this:
; Emitting BLENDED_CODE for X64 CPU with SSE2 - Unix
       push     rbp
       push     rbx
       push     rax
       lea      rbp, [rsp+10H]
						;; size=8 bbWeight=1 PerfScore 3.50
       mov      eax, dword ptr [rdi+0CH]
       mov      ebx, dword ptr [rdi+08H]
       sub      eax, ebx
       movsxd   rdi, eax
       call     [CORINFO_HELP_READYTORUN_NEWARR_1]
       xor      edi, edi
       mov      esi, dword ptr [rax+08H]
       test     esi, esi
       je       SHORT G_M50617_IG04
						;; size=26 bbWeight=1 PerfScore 11.00
G_M50617_IG03:
       cmp      edi, esi
       jae      SHORT G_M50617_IG05
       mov      edx, edi
       mov      dword ptr [rax+4*rdx+10H], ebx
       inc      ebx
       inc      edi
       cmp      esi, edi
       jne      SHORT G_M50617_IG03
						;; size=18 bbWeight=4 PerfScore 17.00
G_M50617_IG04:
       add      rsp, 8
       pop      rbx
       pop      rbp
       ret      
						;; size=7 bbWeight=1 PerfScore 2.25
G_M50617_IG05:
       call     [CORINFO_HELP_RNGCHKFAIL]
       int3     
						;; size=7 bbWeight=0 PerfScore 0.00

C:ToArray_Diff():int[]:this:
; Emitting BLENDED_CODE for X64 CPU with SSE2 - Unix
       push     rbp
       push     rbx
       push     rax
       lea      rbp, [rsp+10H]
						;; size=8 bbWeight=1 PerfScore 3.50
       mov      eax, dword ptr [rdi+0CH]
       mov      ebx, dword ptr [rdi+08H]
       sub      eax, ebx
       movsxd   rdi, eax
       call     [CORINFO_HELP_READYTORUN_NEWARR_1]
       xor      edi, edi
       mov      esi, dword ptr [rax+08H]
       test     esi, esi
       jle      SHORT G_M19969_IG04
						;; size=26 bbWeight=1 PerfScore 11.00
G_M19969_IG03:
       mov      edx, edi
       mov      dword ptr [rax+4*rdx+10H], ebx
       inc      ebx
       inc      edi
       cmp      esi, edi
       jg       SHORT G_M19969_IG03
						;; size=14 bbWeight=4 PerfScore 12.00
G_M19969_IG04:
       add      rsp, 8
       pop      rbx
       pop      rbp
       ret      
						;; size=7 bbWeight=1 PerfScore 2.25

cc: @stephentoub

@ghost ghost added area-System.Linq community-contribution Indicates that the PR has been added by a community member labels Jan 22, 2023
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ghost commented Jan 22, 2023

Tagging subscribers to this area: @dotnet/area-system-linq
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Issue Details

See #80633 (comment):

// crossgen2 8.0.0-alpha.1.23061.99+71bb0d481086b8b8a89a99a17ec80a861f32dc5d

C:ToArray_Base():int[]:this:
; Emitting BLENDED_CODE for X64 CPU with SSE2 - Unix
       push     rbp
       push     rbx
       push     rax
       lea      rbp, [rsp+10H]
						;; size=8 bbWeight=1 PerfScore 3.50
       mov      eax, dword ptr [rdi+0CH]
       mov      ebx, dword ptr [rdi+08H]
       sub      eax, ebx
       movsxd   rdi, eax
       call     [CORINFO_HELP_READYTORUN_NEWARR_1]
       xor      edi, edi
       mov      esi, dword ptr [rax+08H]
       test     esi, esi
       je       SHORT G_M50617_IG04
						;; size=26 bbWeight=1 PerfScore 11.00
G_M50617_IG03:
       cmp      edi, esi
       jae      SHORT G_M50617_IG05
       mov      edx, edi
       mov      dword ptr [rax+4*rdx+10H], ebx
       inc      ebx
       inc      edi
       cmp      esi, edi
       jne      SHORT G_M50617_IG03
						;; size=18 bbWeight=4 PerfScore 17.00
G_M50617_IG04:
       add      rsp, 8
       pop      rbx
       pop      rbp
       ret      
						;; size=7 bbWeight=1 PerfScore 2.25
G_M50617_IG05:
       call     [CORINFO_HELP_RNGCHKFAIL]
       int3     
						;; size=7 bbWeight=0 PerfScore 0.00

C:ToArray_Diff():int[]:this:
; Emitting BLENDED_CODE for X64 CPU with SSE2 - Unix
       push     rbp
       push     rbx
       push     rax
       lea      rbp, [rsp+10H]
						;; size=8 bbWeight=1 PerfScore 3.50
       mov      eax, dword ptr [rdi+0CH]
       mov      ebx, dword ptr [rdi+08H]
       sub      eax, ebx
       movsxd   rdi, eax
       call     [CORINFO_HELP_READYTORUN_NEWARR_1]
       xor      edi, edi
       mov      esi, dword ptr [rax+08H]
       test     esi, esi
       jle      SHORT G_M19969_IG04
						;; size=26 bbWeight=1 PerfScore 11.00
G_M19969_IG03:
       mov      edx, edi
       mov      dword ptr [rax+4*rdx+10H], ebx
       inc      ebx
       inc      edi
       cmp      esi, edi
       jg       SHORT G_M19969_IG03
						;; size=14 bbWeight=4 PerfScore 12.00
G_M19969_IG04:
       add      rsp, 8
       pop      rbx
       pop      rbp
       ret      
						;; size=7 bbWeight=1 PerfScore 2.25
Author: xtqqczze
Assignees: -
Labels:

area-System.Linq, community-contribution
Milestone: -

xtqqczze
xtqqczze commented Jan 22, 2023
View reviewed changes
Comment thread src/libraries/System.Linq/src/System/Linq/Range.SpeedOpt.cs
@xtqqczze xtqqczze changed the title Remove RangeIterator.ToArray bounds check Eliminate RangeIterator.ToArray bounds check Jan 22, 2023
@xtqqczze xtqqczze changed the title Eliminate RangeIterator.ToArray bounds check Eliminate RangeIterator.ToArray() bounds check Jan 22, 2023
@xtqqczze xtqqczze changed the title Eliminate RangeIterator.ToArray() bounds check Eliminate RangeIterator.ToArray bounds check Jan 22, 2023
stephentoub
stephentoub approved these changes Jan 22, 2023
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Thanks

@xtqqczze xtqqczze changed the title Eliminate RangeIterator.ToArray bounds check Eliminate ToArray bounds checks Jan 22, 2023
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xtqqczze commented Jan 22, 2023

@stephentoub Found some more instances of the same.

MichalPetryka
MichalPetryka reviewed Jan 22, 2023
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Comment thread src/libraries/System.Linq/src/System/Linq/Partition.SpeedOpt.cs
Comment on lines +257 to 260
for (int i = 0, curIdx = _minIndexInclusive; i < array.Length; ++i, ++curIdx)
{
array[i] = _source[curIdx];
}
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Suggested change
for (int i = 0, curIdx = _minIndexInclusive; i < array.Length; ++i, ++curIdx)
{
array[i] = _source[curIdx];
}
int minIndexInclusive = _minIndexInclusive;
for (int i = 0; i < array.Length; ++i)
{
array[i] = _source[i + minIndexInclusive];
}

This feels a bit simpler to me.

@stephentoub stephentoub merged commit a272954 into dotnet:main Jan 23, 2023
@xtqqczze xtqqczze mentioned this pull request Jan 23, 2023
Merged
mdh1418 pushed a commit to mdh1418/runtime that referenced this pull request Jan 24, 2023
@xtqqczze @mdh1418
Eliminate ToArray bounds checks (dotnet#81001)
77aeaac 
* Remove `RangeIterator.ToArray` bounds check

dotnet#80633 (comment)

* Eliminate additional `ToArray` bounds checks
@xtqqczze xtqqczze mentioned this pull request Jan 24, 2023
Closed
@ghost ghost locked as resolved and limited conversation to collaborators Feb 22, 2023
@xtqqczze xtqqczze deleted the patch-1 branch September 22, 2025 23:09
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@stephentoub stephentoub stephentoub approved these changes

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