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rustc: Disable NEON on armv7 android.

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We thought Google's ABI for arvm7 required neon, but it is
currently optional, perhaps because there is a significant
population of Tegra 2 devices still in use.

This turns off neon code generation outside #[target-feature]
blocks just like we do on armv7-unknown-linux-gnu, but unlike
most other armv7 targets. LLVM defaults to +neon for this target,
so an explicit disable is necessary.

See https://developer.android.com/ndk/guides/abis.html#v7a
for instruction set extension requirements.

Closes #38402.
This commit is contained in:
Ralph Giles 2016-12-16 10:54:48 -08:00
parent d250169cb5
commit e900f6c7fe
1 changed files with 2 additions and 2 deletions
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4
src/librustc_back/target/armv7_linux_androideabi.rs
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@ -1,4 +1,4 @@
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
@ -12,7 +12,7 @@ use target::{Target, TargetOptions, TargetResult};
pub fn target() -> TargetResult {
let mut base = super::android_base::opts();
base.features = "+v7,+thumb2,+vfp3,+d16".to_string();
base.features = "+v7,+thumb2,+vfp3,+d16,-neon".to_string();
base.max_atomic_width = Some(64);
Ok(Target {