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[MIR] improve operand lifetimes #40133

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merged 4 commits into from Mar 3, 2017
Merged

[MIR] improve operand lifetimes #40133

merged 4 commits into from Mar 3, 2017

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arielb1
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@arielb1 arielb1 commented Feb 27, 2017

r? @eddyb

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arielb1 commented Feb 27, 2017

cc @nagisa

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eddyb commented Feb 27, 2017

@bors r+

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bors commented Feb 27, 2017

📌 Commit 7f8529d has been approved by eddyb

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eddyb commented Feb 28, 2017

@bors r-

/checkout/src/test/codegen/lifetime_start_end.rs:39:11: error: expected string not found in input
// CHECK: [[E_b:%[0-9]+]] = bitcast %"core::option::Option<i32>"** %b to i8*
          ^
/checkout/obj/build/x86_64-unknown-linux-gnu/test/codegen/lifetime_start_end.ll:37:2: note: scanning from here
 %9 = bitcast i32* %c to i8*
 ^

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arielb1 commented Feb 28, 2017

@bors r=eddyb

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bors commented Feb 28, 2017

📌 Commit e4458de has been approved by eddyb

frewsxcv added a commit to frewsxcv/rust that referenced this pull request Mar 2, 2017
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Rollup merge of rust-lang#40133 - arielb1:operand-lifetimes, r=eddyb
21d61ff 
[MIR] improve operand lifetimes

r? @eddyb
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frewsxcv commented Mar 2, 2017

Could this failure be related? #40211 (comment)

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frewsxcv commented Mar 2, 2017

Yes, Travis in this PR also has the fail

@bors r-

@arielb1
schedule drops on bindings only after initializing them
6755fb8 
This reduces the number of dynamic drops in libstd from 1141 to 899.
However, without this change, the next patch would have created much
more dynamic drops.

A basic merge unswitching hack reduced the number of dynamic drops to
644, with no effect on stack usage. I should be writing a more dedicated
drop unswitching pass.

No performance measurements.
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arielb1 commented Mar 3, 2017

@bors r=eddyb

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bors commented Mar 3, 2017

📌 Commit 31faaf2 has been approved by eddyb

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bors commented Mar 3, 2017

⌛ Testing commit 31faaf2 with merge d6e5b10...

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bors commented Mar 3, 2017

💔 Test failed - status-appveyor

@arielb1
make operands live to the end of their containing expression
906c06a 
In MIR construction, operands need to live exactly until they are used,
which is during the (sub)expression that made the call to `as_operand`.

Before this PR, operands lived until the end of the temporary scope,
which was sometimes unnecessarily longer and sometimes too short.

Fixes rust-lang#38669.
@arielb1
fix codegen test
3ffa971
@arielb1
work around LLVM PR#32123
f99f1f8
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arielb1 commented Mar 3, 2017

Rebase damage.

@bors r=eddyb

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bors commented Mar 3, 2017

💡 This pull request was already approved, no need to approve it again.

  • This pull request previously failed. You should add more commits to fix the bug, or use retry to trigger a build again.
  • There's another pull request that is currently being tested, blocking this pull request: Reduce std_unicode’s public API #40189

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bors commented Mar 3, 2017

📌 Commit 31faaf2 has been approved by eddyb

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arielb1 commented Mar 3, 2017

@bors r=eddyb f99f1f8

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arielb1 commented Mar 3, 2017

@bors r-

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arielb1 commented Mar 3, 2017

@bors r=eddyb

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bors commented Mar 3, 2017

📌 Commit f99f1f8 has been approved by eddyb

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bors commented Mar 3, 2017

⌛ Testing commit f99f1f8 with merge b2a424f...

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bors commented Mar 3, 2017

💔 Test failed - status-appveyor

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arielb1 commented Mar 3, 2017 

C:/projects/rust/mingw32/bin/ar.exe: unable to rename '../../../libLLVMSparcDesc.a'; reason: Permission denied

Looks spurious

@bors retry

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bors commented Mar 3, 2017

⌛ Testing commit f99f1f8 with merge f0b5145...

bors added a commit that referenced this pull request Mar 3, 2017
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Auto merge of #40133 - arielb1:operand-lifetimes, r=eddyb
f0b5145 
[MIR] improve operand lifetimes

r? @eddyb
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bors commented Mar 3, 2017

☀️ Test successful - status-appveyor, status-travis
Approved by: eddyb
Pushing f0b5145 to master...

@bors bors merged commit f99f1f8 into rust-lang:master Mar 3, 2017
@bors bors mentioned this pull request Mar 3, 2017
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@arielb1 arielb1 mentioned this pull request Mar 17, 2017
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@arielb1 arielb1 mentioned this pull request Mar 28, 2017
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