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| author | Benjamin Maxwell <benjamin.maxwell@arm.com> | 2025-08-06 09:21:57 +0100 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2025-08-06 09:21:57 +0100 |
| commit | ff5fa711b3078b3305aa5b5a2d02f9d97421c662 (patch) | |
| tree | c062ed1ffb7d07fe129e9b80d45fee96199a40de /llvm/lib/Object/ELFObjectFile.cpp | |
| parent | 753885eaaf8745a64f502a3a65fa89456d632cd5 (diff) | |
| download | llvm-ff5fa711b3078b3305aa5b5a2d02f9d97421c662.zip llvm-ff5fa711b3078b3305aa5b5a2d02f9d97421c662.tar.gz llvm-ff5fa711b3078b3305aa5b5a2d02f9d97421c662.tar.bz2 | |
[AArch64][SVE] Tweak how SVE CFI expressions are emitted (#151677)
The main change in this patch is we go from emitting the expression:
@ cfa - NumBytes - NumScalableBytes * VG
To:
@ cfa - VG * NumScalableBytes - NumBytes
That is, VG is the first expression. This is for a future patch that
adds an alternative way to resolve VG (which uses the CFA, so it is
convenient for the CFA to be at the top of the stack).
Since doing this is fairly churn-heavy, I took the opportunity to also
save up to 4-bytes per SVE CFI expression. This is done by folding
LEB128 constants to literals when in the range 0 to 31, and using the
offset in `DW_OP_breg*` expressions.
Diffstat (limited to 'llvm/lib/Object/ELFObjectFile.cpp')
0 files changed, 0 insertions, 0 deletions