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[scudo] Add support for LoongArch hardware CRC32 checksumming #83113

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Merged
merged 1 commit into from
Mar 2, 2024
Merged

[scudo] Add support for LoongArch hardware CRC32 checksumming #83113

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16 changes: 16 additions & 0 deletions compiler-rt/lib/scudo/standalone/checksum.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,8 @@
#else
#include <sys/auxv.h>
#endif
#elif defined(__loongarch__)
#include <sys/auxv.h>
#endif

namespace scudo {
Expand Down Expand Up @@ -75,6 +77,20 @@ bool hasHardwareCRC32() {
return !!(getauxval(AT_HWCAP) & HWCAP_CRC32);
#endif // SCUDO_FUCHSIA
}
#elif defined(__loongarch__)
// The definition is only pulled in by <sys/auxv.h> since glibc 2.38, so
// supply it if missing.
#ifndef HWCAP_LOONGARCH_CRC32
#define HWCAP_LOONGARCH_CRC32 (1 << 6)
#endif
// Query HWCAP for platform capability, according to *Software Development and
// Build Convention for LoongArch Architectures* v0.1, Section 9.1.
//
// Link:
// https://github.com/loongson/la-softdev-convention/blob/v0.1/la-softdev-convention.adoc#kernel-development
bool hasHardwareCRC32() {
return !!(getauxval(AT_HWCAP) & HWCAP_LOONGARCH_CRC32);
}
#else
// No hardware CRC32 implemented in Scudo for other architectures.
bool hasHardwareCRC32() { return false; }
Expand Down
4 changes: 4 additions & 0 deletions compiler-rt/lib/scudo/standalone/checksum.h
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Expand Up @@ -30,6 +30,10 @@
#include <arm_acle.h>
#define CRC32_INTRINSIC FIRST_32_SECOND_64(__crc32cw, __crc32cd)
#endif
#ifdef __loongarch__
#include <larchintrin.h>
#define CRC32_INTRINSIC FIRST_32_SECOND_64(__crcc_w_w_w, __crcc_w_d_w)
#endif

namespace scudo {

Expand Down
9 changes: 9 additions & 0 deletions compiler-rt/lib/scudo/standalone/crc32_hw.cpp
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Expand Up @@ -17,4 +17,13 @@ u32 computeHardwareCRC32(u32 Crc, uptr Data) {
#endif // defined(__CRC32__) || defined(__SSE4_2__) ||
// defined(__ARM_FEATURE_CRC32)

#if defined(__loongarch__)
u32 computeHardwareCRC32(u32 Crc, uptr Data) {
// The LoongArch CRC intrinsics have the two input arguments swapped, and
// expect them to be signed.
return static_cast<u32>(
CRC32_INTRINSIC(static_cast<long>(Data), static_cast<int>(Crc)));
}
#endif // defined(__loongarch__)

} // namespace scudo