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Always set InstructionSet_ArmBase in PAL_GetJitCpuCapabilityFlags #34107

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merged 1 commit into from
Mar 26, 2020
Merged

Always set InstructionSet_ArmBase in PAL_GetJitCpuCapabilityFlags #34107

merged 1 commit into from
Mar 26, 2020

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echesakov
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PAL_GetJitCpuCapabilityFlags should always set InstructionSet_ArmBase.
Otherwise based on an algorithm added in #33936

runtime/src/coreclr/src/inc/corinfoinstructionset.h

Lines 180 to 195 in 951bc70

if (resultflags.HasInstructionSet(InstructionSet_ArmBase) && !resultflags.HasInstructionSet(InstructionSet_ArmBase_Arm64))
resultflags.RemoveInstructionSet(InstructionSet_ArmBase);
if (resultflags.HasInstructionSet(InstructionSet_AdvSimd) && !resultflags.HasInstructionSet(InstructionSet_AdvSimd_Arm64))
resultflags.RemoveInstructionSet(InstructionSet_AdvSimd);
if (resultflags.HasInstructionSet(InstructionSet_Crc32) && !resultflags.HasInstructionSet(InstructionSet_Crc32_Arm64))
resultflags.RemoveInstructionSet(InstructionSet_Crc32);
if (resultflags.HasInstructionSet(InstructionSet_AdvSimd) && !resultflags.HasInstructionSet(InstructionSet_ArmBase))
resultflags.RemoveInstructionSet(InstructionSet_AdvSimd);
if (resultflags.HasInstructionSet(InstructionSet_Aes) && !resultflags.HasInstructionSet(InstructionSet_ArmBase))
resultflags.RemoveInstructionSet(InstructionSet_Aes);
if (resultflags.HasInstructionSet(InstructionSet_Crc32) && !resultflags.HasInstructionSet(InstructionSet_ArmBase))
resultflags.RemoveInstructionSet(InstructionSet_Crc32);
if (resultflags.HasInstructionSet(InstructionSet_Sha1) && !resultflags.HasInstructionSet(InstructionSet_ArmBase))
resultflags.RemoveInstructionSet(InstructionSet_Sha1);
if (resultflags.HasInstructionSet(InstructionSet_Sha256) && !resultflags.HasInstructionSet(InstructionSet_ArmBase))
resultflags.RemoveInstructionSet(InstructionSet_Sha256);
we will end up with AdvSimd, Crc32 removed from the set of supported ISAs, but not their 64-bit counterparts AdvSimd_Arm64 and Crc32_Arm64.

This was a reason of failure as seen in #33749 (comment) where code guarded with AdvSimd.IsSupported was just removed by JIT as dead but code guarded with AdvSimd.Arm64.IsSupported as in System.Collections.BitArray..ctor(Boolean[] values) was throwing System.PlatformNotSupportedException from JIT.

cc @davidwrighton @CarolEidt @tannergooding

@echesakov
Unconditionally enable InstructionSet_ArmBase in PAL_GetJitCpuCapabil…
75f37f9 
…ityFlags in src/coreclr/src/pal/src/misc/jitsupport.cpp
@echesakov echesakov added arch-arm64 os-linux Linux OS (any supported distro) area-PAL-coreclr labels Mar 26, 2020
@echesakov echesakov mentioned this pull request Mar 26, 2020
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@jaredpar jaredpar mentioned this pull request Mar 26, 2020
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CarolEidt
CarolEidt approved these changes Mar 26, 2020
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LGTM - thanks for finding and fixing this!

@davidwrighton
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Sigh, this is a good fix but missing ArmBase should also be removing the 64bit variants of everything too. I'll address that in another pr.

@davidwrighton davidwrighton mentioned this pull request Mar 26, 2020
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@echesakov
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Failure on win-x86 rel is unrelated and tracked by #34128

@echesakov echesakov merged commit 24e10f6 into dotnet:master Mar 26, 2020
@echesakov echesakov deleted the GetJitCpuCapabilityFlags-Add-InstructionSet-ArmBase branch March 26, 2020 19:17
@echesakov echesakov mentioned this pull request Apr 1, 2020
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@kunalspathak kunalspathak mentioned this pull request Apr 3, 2020
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@tannergooding tannergooding tannergooding approved these changes

@CarolEidt CarolEidt CarolEidt approved these changes

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@echesakov @davidwrighton @CarolEidt @tannergooding