boringssl

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Author	SHA1	Message	Date
David Benjamin	f9bd455c85	Skip runtime NEON checks if __ARM_NEON is defined. When a feature is enabled statically in the build config, the compiler defines __ARM_NEON and also considers itself free to emit NEON code. In this case, there is no need to check for NEON support at runtime since the binary will not work without NEON anyway. Moving the check to compile time lets us drop unused code. Chrome has required NEON on Android for nearly five years now. However, historically there was a bad CPU which broke on some NEON code, but not others. See https://crbug.com/341598 and https://crbug.com/606629. We worked around that CPU by parsing /proc/cpuinfo and intentionally dropping the optimization. This is not a stable situation, however, as we're hoping the compiler is not good enough at emitting NEON to trigger this bug. Since then, the number of affected devices has dropped, and Chrome has raised the minimum Android requirement to L. The Net.HasBrokenNEON metric from Chrome is now well in the noise. This CL stops short of removing the workaround altogether because some consumers of Cronet are unsure whether they needed this workaround. Those consumers also build without __ARM_NEON, so gating on that works out. We'll decide what to do with it pending metrics from them. Update-Note: Builds with __ARM_NEON (-mfpu=neon) will now drop about 30KiB of dead code, but no longer work (if they even did before) on a particular buggy CPU. Builds without __ARM_NEON are not affected. Change-Id: Id8f7bccfb75afe0a1594572ea20c51d275b0a256 Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/45484 Reviewed-by: Adam Langley <agl@google.com> Commit-Queue: David Benjamin <davidben@google.com>	4 years ago
Adam Langley	fb0c05cac2	acvp: add CMAC-AES support. Change by Dan Janni. Change-Id: I3f059e7b1a822c6f97128ca92a693499a3f7fa8f Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/41984 Commit-Queue: Adam Langley <agl@google.com> Reviewed-by: David Benjamin <davidben@google.com>	5 years ago

Author

SHA1

Message

Date

David Benjamin

f9bd455c85

Skip runtime NEON checks if __ARM_NEON is defined.

When a feature is enabled statically in the build config, the compiler
defines __ARM_NEON and also considers itself free to emit NEON code.
In this case, there is no need to check for NEON support at runtime
since the binary will not work without NEON anyway. Moving the check to
compile time lets us drop unused code.

Chrome has required NEON on Android for nearly five years now. However,
historically there was a bad CPU which broke on some NEON code, but not
others. See https://crbug.com/341598 and https://crbug.com/606629. We
worked around that CPU by parsing /proc/cpuinfo and intentionally
dropping the optimization. This is not a stable situation, however, as
we're hoping the compiler is not good enough at emitting NEON to trigger
this bug.

Since then, the number of affected devices has dropped, and Chrome has
raised the minimum Android requirement to L. The Net.HasBrokenNEON
metric from Chrome is now well in the noise.

This CL stops short of removing the workaround altogether because some
consumers of Cronet are unsure whether they needed this workaround.
Those consumers also build without __ARM_NEON, so gating on that works
out. We'll decide what to do with it pending metrics from them.

Update-Note: Builds with __ARM_NEON (-mfpu=neon) will now drop about
30KiB of dead code, but no longer work (if they even did before) on a
particular buggy CPU. Builds without __ARM_NEON are not affected.

Change-Id: Id8f7bccfb75afe0a1594572ea20c51d275b0a256
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/45484
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: David Benjamin <davidben@google.com>

4 years ago

Adam Langley

fb0c05cac2

acvp: add CMAC-AES support.

Change by Dan Janni.

Change-Id: I3f059e7b1a822c6f97128ca92a693499a3f7fa8f
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/41984
Commit-Queue: Adam Langley <agl@google.com>
Reviewed-by: David Benjamin <davidben@google.com>

5 years ago

2 Commits (6191cc95a1ef9a7b0a3f79ac23cbbbba85698c0f)