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mark build::cfg::start_new_block as inline(never) - #41015
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LLVM has a bug - PR32488 - where it fails to deduplicate allocas in some circumstances. The function `start_new_block` has allocas totalling 1216 bytes, and when LLVM inlines several copies of that function into the recursive function `expr::into`, that function's stack space usage goes into tens of kiBs, causing stack overflows. Mark `start_new_block` as inline(never) to keep it from being inlined, getting stack usage under control. Fixesrust-lang#40493. Fixesrust-lang#40573.
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frewsxcv added a commit
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alexcrichton
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Apr 4, 2017
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@bors: r+ (already landed on beta anyway) |
bors
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Apr 4, 2017
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📌 Commit 09ac56d has been approved by |
nikomatsakis
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Apr 5, 2017
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Nice job @arielb1 ! |
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…hton mark build::cfg::start_new_block as inline(never) LLVM has a bug - [PR32488](https://bugs.llvm.org//show_bug.cgi?id=32488) - where it fails to deduplicate allocas in some circumstances. The function `start_new_block` has allocas totalling 1216 bytes, and when LLVM inlines several copies of that function into the recursive function `expr::into`, that function's stack space usage goes into tens of kiBs, causing stack overflows. Mark `start_new_block` as inline(never) to keep it from being inlined, getting stack usage under control. Fixesrust-lang#40493. Fixesrust-lang#40573. r? @eddyb
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LLVM has a bug - PR32488 - where it fails to deduplicate allocas in some
circumstances. The function
start_new_blockhas allocas totalling 1216bytes, and when LLVM inlines several copies of that function into
the recursive function
expr::into, that function's stack space usagegoes into tens of kiBs, causing stack overflows.
Mark
start_new_blockas inline(never) to keep it from being inlined,getting stack usage under control.
Fixes#40493.
Fixes#40573.
r? @eddyb