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asm: Allow the use of r8-r14 as clobbers on Thumb1 #93877

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merged 1 commit into from
Feb 19, 2022
Merged

asm: Allow the use of r8-r14 as clobbers on Thumb1 #93877

merged 1 commit into from
Feb 19, 2022

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Amanieu
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@Amanieu Amanieu commented Feb 10, 2022

Previously these were entirely disallowed, except for r11 which was allowed by accident.

cc @hudson-ayers

@rustbot rustbot added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Feb 10, 2022
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r? @jackh726

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@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Feb 10, 2022
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Not my area of expertise

r? rust-lang/compiler

@rust-highfive rust-highfive assigned cjgillot and unassigned jackh726 Feb 12, 2022
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Not mine either...
r? @joshtriplett
since they reviewed #91643.
Except if @Amanieu has a reviewer in mind.

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Amanieu commented Feb 17, 2022

r? @nagisa

@rust-highfive rust-highfive assigned nagisa and unassigned joshtriplett Feb 17, 2022
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nagisa reviewed Feb 17, 2022
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compiler/rustc_target/src/asm/mod.rs
@@ -298,54 +299,87 @@ impl InlineAsmReg {
arch: InlineAsmArch,
target_features: &FxHashSet<Symbol>,
target: &Target,
is_clobber: bool,
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@nagisa nagisa Feb 17, 2022 •
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I wonder if it wouldn't make sense to proactively make this a tri-state enum describing the context (clobber, input, output). I can imagine it being useful when we decide to actually start adding constraint classes that are applicable to input or output only.

And today it would serve as a way to avoid bool proliferation.

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I have a followup PR based on this one which is a pain to rebase. I'll make the change there.

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nagisa commented Feb 17, 2022

LGTM r=me with or without replacement of the bool.

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Amanieu commented Feb 18, 2022

@bors r=nagisa

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bors commented Feb 18, 2022

📌 Commit 5ab3483b360dae11f92c9e8fd7a90035934f60e0 has been approved by nagisa

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Feb 18, 2022
nbdd0121
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compiler/rustc_ast_lowering/src/asm.rs Outdated
late,
expr: self.lower_expr_mut(expr),
}
}
InlineAsmOperand::SplitInOut { reg, late, ref in_expr, ref out_expr } => {
hir::InlineAsmOperand::SplitInOut {
reg: lower_reg(reg),
reg: lower_reg(reg, out_expr.is_none()),
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Shouldn't this be false? Would this permit inout("r8") 1 => _?

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@nagisa nagisa Feb 18, 2022 •
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That's still a clobber just like out("r8") _ is.

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Actually that's a good point, this is incorrect since we don't want to allow r8 to be used as an input in Thumb1.

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Perhaps the name could be clobber_only instead of is_clobber to make it more clear. And we might want an unit test.

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Amanieu commented Feb 18, 2022

@bors r-

@bors bors added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Feb 18, 2022
@Amanieu
asm: Allow the use of r8-r14 as clobbers on Thumb1
11250b8 
Previously these were entirely disallowed, except for r11 which was
allowed by accident.
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Amanieu commented Feb 18, 2022

@bors r=nagisa

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bors commented Feb 18, 2022

📌 Commit 5ab3483b360dae11f92c9e8fd7a90035934f60e0 has been approved by nagisa

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Feb 18, 2022
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Amanieu commented Feb 18, 2022

@bors r=nagisa

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bors commented Feb 18, 2022

📌 Commit 11250b8 has been approved by nagisa

@matthiaskrgr matthiaskrgr mentioned this pull request Feb 18, 2022
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bors added a commit to rust-lang-ci/rust that referenced this pull request Feb 19, 2022
@bors
Auto merge of rust-lang#94134 - matthiaskrgr:rollup-b132kjz, r=matthi…
1882597 
…askrgr

Rollup of 10 pull requests

Successful merges:

 - rust-lang#89892 (Suggest `impl Trait` return type when incorrectly using a generic return type)
 - rust-lang#91675 (Add MemTagSanitizer Support)
 - rust-lang#92806 (Add more information to `impl Trait` error)
 - rust-lang#93497 (Pass `--test` flag through rustdoc to rustc so `#[test]` functions can be scraped)
 - rust-lang#93814 (mips64-openwrt-linux-musl: correct soft-foat)
 - rust-lang#93847 (kmc-solid: Use the filesystem thread-safety wrapper)
 - rust-lang#93877 (asm: Allow the use of r8-r14 as clobbers on Thumb1)
 - rust-lang#93892 (Only mark projection as ambiguous if GAT substs are constrained)
 - rust-lang#93915 (Implement --check-cfg option (RFC 3013), take 2)
 - rust-lang#93953 (Add the `known-bug` test directive, use it, and do some cleanup)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit cb35370 into rust-lang:master Feb 19, 2022
@rustbot rustbot added this to the 1.60.0 milestone Feb 19, 2022
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