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Add entries for Neoverse N2,V1, and V2 into CRC dynamic dispatch table.

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PiperOrigin-RevId: 571430428
Change-Id: I4777c37c5287d26a75f37fe059324ac218878f0e
This commit is contained in:
Connal de Souza
2023-10-06 14:06:54 -07:00
committed by Copybara-Service
parent aac30f6d2c
commit f3ba72ee55
3 changed files with 28 additions and 5 deletions
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25
absl/crc/internal/cpu_detect.cc
View File

@@ -243,11 +243,26 @@ CpuType GetCpuType() {
ABSL_INTERNAL_AARCH64_ID_REG_READ(MIDR_EL1, midr);
uint32_t implementer = (midr >> 24) & 0xff;
uint32_t part_number = (midr >> 4) & 0xfff;
if (implementer == 0x41 && part_number == 0xd0c) {
return CpuType::kArmNeoverseN1;
}
if (implementer == 0xc0 && part_number == 0xac3) {
return CpuType::kAmpereSiryn;
switch (implementer) {
case 0x41:
switch (part_number) {
case 0xd0c: return CpuType::kArmNeoverseN1;
case 0xd40: return CpuType::kArmNeoverseV1;
case 0xd49: return CpuType::kArmNeoverseN2;
case 0xd4f: return CpuType::kArmNeoverseV2;
default:
return CpuType::kUnknown;
}
break;
case 0xc0:
switch (part_number) {
case 0xac3: return CpuType::kAmpereSiryn;
default:
return CpuType::kUnknown;
}
break;
default:
return CpuType::kUnknown;
}
}
return CpuType::kUnknown;

3
absl/crc/internal/cpu_detect.h
View File

@@ -39,7 +39,10 @@ enum class CpuType {
kIntelSandybridge,
kIntelWestmere,
kArmNeoverseN1,
kArmNeoverseV1,
kAmpereSiryn,
kArmNeoverseN2,
kArmNeoverseV2
};
// Returns the type of host CPU this code is running on. Returns kUnknown if

5
absl/crc/internal/crc_x86_arm_combined.cc
View File

@@ -634,11 +634,16 @@ CRCImpl* TryNewCRC32AcceleratedX86ARMCombined() {
return new CRC32AcceleratedX86ARMCombinedMultipleStreams<
3, 0, CutoffStrategy::Fold3>();
case CpuType::kArmNeoverseN1:
case CpuType::kArmNeoverseN2:
case CpuType::kArmNeoverseV1:
return new CRC32AcceleratedX86ARMCombinedMultipleStreams<
1, 1, CutoffStrategy::Unroll64CRC>();
case CpuType::kAmpereSiryn:
return new CRC32AcceleratedX86ARMCombinedMultipleStreams<
3, 2, CutoffStrategy::Fold3>();
case CpuType::kArmNeoverseV2:
return new CRC32AcceleratedX86ARMCombinedMultipleStreams<
1, 2, CutoffStrategy::Unroll64CRC>();
#if defined(__aarch64__)
default:
// Not all ARM processors support the needed instructions, so check here