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SSE disabled libstd creates an error #66644

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mincheolsung opened this issue Nov 22, 2019 · 2 comments
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SSE disabled libstd creates an error #66644

mincheolsung opened this issue Nov 22, 2019 · 2 comments
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A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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@mincheolsung
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mincheolsung commented Nov 22, 2019 •
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I added disabling SSE and MMX on https://github.com/hermitcore/rust/blob/ab6cb0197188f0c842d7dd2e378777f0bc0f6240/src/librustc_target/spec/x86_64_unknown_hermit.rs#L7 and built libstd.

When I tried to build an application with -C soft-float, I got LLVM ERROR: SSE register return with SSE disabled.
@jonas-schievink
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It is possible that LLVM simply does not handle this, since you're building for x86-64, which always has SSE available.

@jonas-schievink jonas-schievink added A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Nov 22, 2019
@mincheolsung
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I tried with -Ctarget-feature=+soft-float instead of -C soft-float and it fixed the issue.

@dtolnay dtolnay mentioned this issue Sep 29, 2020
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A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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