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Add a -Z flag for LLVM align attributes on arguments - #49122
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LLVM seems to still put the assume calls in when inlining, so this probably isn't in a place where it can be turned on by default, but it's interesting to experiment with. For example, this makes `swap::<u64x8>` be 8x `vmovaps ymm` instead of 16x `vmovups xmm`, on my cpu.
rust-highfive
commented
Mar 17, 2018
Contributor
r? @cramertj (rust_highfive has picked a reviewer for you, use r? to override) |
cramertj
commented
Mar 19, 2018
Member
@bors r+ |
cramertj
commented
Mar 19, 2018
Member
@scottmcm Can you create an issue tracking this flag? |
MemberAuthor
Tracking issue added: #49185 (oops, don't know why what I typed before triggered the bot) |
bors
commented
Mar 19, 2018
Collaborator
@scottmcm: 🔑 Insufficient privileges: Not in reviewers |
bors
commented
Mar 19, 2018
Collaborator
@scottmcm: 🔑 Insufficient privileges: not in try users |
scottmcm
commented
Mar 22, 2018
MemberAuthor
Hmm, there's no bors comment ACKing the r+ here. Does it need to be done again since the bot was broken? |
cramertj
commented
Mar 22, 2018
Member
@bors r+ |
bors
commented
Mar 22, 2018
Collaborator
📌 Commit b498192 has been approved by |
alexcrichton added a commit
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Mar 23, 2018
Add a -Z flag for LLVM align attributes on arguments LLVM seems to still put the assume calls in when inlining, so this probably isn't in a place where it can be turned on by default, but it's interesting to experiment with. For example, this makes `mem::swap::<u64x8>` be 8x `vmovaps ymm` instead of 16x `vmovups xmm`, on my cpu.
kennytm added a commit
to kennytm/rust
that referenced
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Mar 24, 2018
Add a -Z flag for LLVM align attributes on arguments LLVM seems to still put the assume calls in when inlining, so this probably isn't in a place where it can be turned on by default, but it's interesting to experiment with. For example, this makes `mem::swap::<u64x8>` be 8x `vmovaps ymm` instead of 16x `vmovups xmm`, on my cpu.
kennytm added a commit
to kennytm/rust
that referenced
this pull request
Mar 24, 2018
Add a -Z flag for LLVM align attributes on arguments LLVM seems to still put the assume calls in when inlining, so this probably isn't in a place where it can be turned on by default, but it's interesting to experiment with. For example, this makes `mem::swap::<u64x8>` be 8x `vmovaps ymm` instead of 16x `vmovups xmm`, on my cpu.
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LLVM seems to still put the assume calls in when inlining, so this probably isn't in a place where it can be turned on by default, but it's interesting to experiment with.
For example, this makes
mem::swap::<u64x8>be 8xvmovaps ymminstead of 16xvmovups xmm, on my cpu.